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Tytuł:
Comparasion of Crop Water Stress Index (CWSI) and Water Deficit Index (WDI) by using Remote Sensing (RS)
Autorzy:
Tanriverdi, C.
Atilgan, A.
Degirmenci, H.
Akyuz, A.
Powiązania:
https://bibliotekanauki.pl/articles/101434.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
water stress index
crop water stress index
water deficit index
remote sensing
Opis:
Drought, water scarcity and climate changes are very important threats for agriculture on a global basis. Remote Sensing (RS) is accepted as a technique to collect data and determine water stress indices. Water Stress Indices (WSI) are useful tools to prevent drought and determine irrigation scheduling. The water stress indices are primarily identified as the Crop Water Stress Index (CWSI) and the Water Deficit Index (WDI). The effect of soil background is major problem to establish CWSI especially during early growth stage measurements of canopy temperature (Ts). Hence, WDI is a better index when it comprised with CWSI because of Ts. CWSI and WDI can be determined by two different techniques. These are determined by using measured by using traditional components to collect data and estimated methods by applying RS components to collect necessary data. Estimated method has many advantages when this method compared with measured method. However, estimated method needs some RS components which are infrared gun (IR), sling psychrometer, Spectro radiometer. With the help of these tools, the necessary data are obtained and WDI is determined. By using Spectro radiometer vegetation indices are defined. Among the many vegetation indices, the Normalized Difference Vegetation Index (NDVI) is mostly used one. By using NDVI determination of vegetation cover is easy and accurate technique to establish WDI. Establishing these both stress indices with less fieldwork and by saving money, time and labor conveys the necessary information for agriculturists using remotely sensed data especially for large agricultural fields.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2017, III/1; 879-894
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of continuous and periodic water stress on cold hardiness of rhododendron cultivars
Wpływ stałego i okresowego deficytu wody na mrozoodporność odmian różanecznika
Autorzy:
Koniarski, M.
Matysiak, B.
Powiązania:
https://bibliotekanauki.pl/articles/810047.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
water deficit
irrigation system
water stress
continuous water stress
periodic water stress
cold hardiness
frost tolerance
freezing tolerance
rhododendron
plant cultivar
Opis:
The purpose of the present study was to determine whether water deficit affects cold hardiness of rhododendron ‘Catawbiense Boursault’, ‘Lee’s Dark Purple’, ‘Prinz Karneval’ and ‘Old Port’ shrubs. Plants were grown in unheated greenhouse and for 14 weeks from June to mid-September were subjected to six irrigation treatments. In the end of September shrubs were left in an unheated greenhouse or planted into the ground and at the beginning of each month from December to March freezing tolerance tests were performed. The results showed that in all rhododendron cultivars the highest cold hardiness was noted in January and February, lower in March but the lowest in December. Application of four-week water deficit period during summer especially between the first and the second vegetative growth may improve the frost resistance of Rhododendron shrubs.
Badania mrozoodporności liści krzewów różanecznika były prowadzone w dwóch sezonach badawczych (od grudnia 2013 roku do marca 2014 roku oraz od grudnia 2014 roku do marca 2015 roku) w Instytucie Ogrodnictwa, w Skierniewicach. Celem przeprowadzonych badań było określenie następczego wpływu regulowanego deficytu nawadniania (RDI) na mrozoodporność krzewów różanecznika odmian ‘Catawbiense Boursault’, ‘Lee’s Dark Purple’, ‘Prinz Karneval’ oraz ‘Old Port’. W poprzednich sezonach wegetacyjnych rośliny były uprawiane w nieogrzewanej szklarni. Podczas 14 tygodni, od czerwca do połowy września, krzewy były nawadniane zgodnie z sześcioma wariantami nawodnieniowymi (T1–T6) wyznaczonymi na podstawie wartości ewapotranspiracji (ETp). Trzy z nich obejmowały jednakowe, stałe nawadnianie roślin: 1 ETp (rośliny kontrolne, dobrze nawodnione – T1), 0,75 ETp (średni deficyt wody – T2), 0,5 ETp (duży deficyt wody – T3). Pozostałe trzy warianty obejmowały zróżnicowane nawadnianie w czasie trzech faz wzrostu roślin: 1–0,5–1 ETp – silny deficyt wody w fazie II (T4), 1–0,25–1 ETp – bardzo silny deficyt wody w fazie II (T5) i 0,5–1–0,5 ETp – duży deficyt wody w fazach I oraz III, i dobrze nawodnione rośliny w fazie II (T6). Fazy nawadniania I i III (każda trwająca po 5 tygodni) odpowiadały wegetatywnej fazie rozwojowej krzewów. Z kolei faza II nawadniania, trwająca 4 tygodnie, odpowiadała fazie inicjacji kwitnienia oraz tworzenia pąków kwiatostanowych. W końcu września odmiany ‘Lee’s Dark Purple’ i ‘Prinz Karneval’ posadzono do gruntu, a ‘Catawbiense Boursault’ i ‘Old Port’ pozostawały w zimie w szklarni. W obydwu sezonach badawczych na początku każdego miesiąca, od grudnia do marca, były przeprowadzane badania mrozoodporności liści, w których określono uszkodzenia mrozowe na podstawie wycieku elektrolitu z uszkodzonych komórek liścia. W pierwszym sezonie badawczym dla odmian ‘Catawbiense Boursault’ i ‘Old Port’ zastosowano wartości temperatury –10°C, –20°C, –25°C, –30°C, a w drugim doświadczeniu odpowiednio dla odmian ‘Lee’s Dark Purple’ i ‘Prinz Karneval’ liście poddano temperaturze –20°C, –25°C, –30°C. Wyniki badań wykazały dla wszystkich czterech odmian różaneczników, że największa mrozoodporność była notowana w styczniu i lutym, średnia w marcu, zaś najmniejsza w grudniu. Wielkość stresu wodnego istotnie wpływała na mrozoodporność krzewów u wszystkich czterech badanych odmian różaneczników. W wyniku zastosowania traktowań nawodnieniowych T2 i T3 rośliny cechowały się gorszą mrozoodpornością, z kolei użycie traktowań nawodnieniowych T4, T5 oraz T6 poprawiało mrozoodporność krzewów podczas zimy w porównaniu do kontroli.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2017, 588
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Derinkuyu dry bean irrigation planning in semi-arid climate by utilising crop water stress index values
Autorzy:
Uçak, Ali B.
Atılgan, Atılgan
Korytowski, Mariusz
Kocięcka, Joanna
Liberacki, Daniel
Stachowski, Piotr
Saltuk, Burak
Rolbiecki, Roman
Powiązania:
https://bibliotekanauki.pl/articles/28411640.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
dry bean
crop water stress index
CWSI
irrigation time
plant water stress index
Turkey
Opis:
This study was conducted to determine crop water stress index (CWSI) values and irrigation timing in the case of Derinkuyu dry bean (Phaseolus vulgaris L.). In 2017, dry beans were grown as the main crop according to the field design consisting of plots divided into randomised blocks. Irrigation treatment comprised full irrigation (I100) and irrigation issues with three different levels of water stress (I66, I33, I0). This study applied 602 mm of water under the I100 irrigation. The yield of Derinkuyu dry beans was equal to 3576.6 kg∙ha-1 in I100 irrigation. The lower limit (LL) value, which is not necessary for the determination of CWSI, was obtained as the canopy-air temperature difference (Tc - Ta) versus the air vapour pressure deficit (VPD). The upper limit (UL) value, at which the dry beans were wholly exposed to water stress, was obtained at a constant temperature. The threshold CWSI value at which the grain yield of dry beans started to decrease was determined as 0.33 from the measurements made with an infrared thermometer before irrigation in I66 irrigation treatment. As a result, it can be suggested that irrigation should be applied when the CWSI value is 0.33 in dry beans. Furthermore, the correlation analysis revealed a negative correlation between grain yield and crop water stress index and a positive correlation between yield and chlorophyll content. According to variance analysis, significant relationships were found between the analysed parameters at p ≤ 0.01 and p ≤ 0.05.
Źródło:
Journal of Water and Land Development; 2023, 59; 145--152
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation of water-soluble carbohydrates and grain yield in Iranian cold barley promising lines under well-watered and water stress conditions
Autorzy:
Mohammadi, Soleiman
Nazani, Reza Kas
Mahootchi, Ayda Hosseinzadeh
Ftohi, Keiwan
Powiązania:
https://bibliotekanauki.pl/articles/2199735.pdf
Data publikacji:
2013-12-19
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
barley
water-soluble carbohydrate
grain yield
water stress
Opis:
In order to evaluate promising lines in terms of grain yield and water-soluble carbohydrates remobilization, an experiment with fifteen promising lines and two checks was carried out under full irrigation and terminal water stress conditions at Miyandoab Agricultural Research and Natural Resources Station. Mobilized dry matter content and remobilization percentage from shoot to grain under water deficit (177mg)(11.2%) were greater than those under well watering condition. The lowest (110 mg) and the highest (260mg) mobilized dry matter to grain were obtained for C-79-18 and C-83-15lines, respectively. Water deficit reduced grain yield of barley genotypes by 200-1600 kg/ha, and mean grain yield reduction was 800 kg/ha. Line 14 with 5.880and 5.300t/ha grain yield in favorable and water stress conditions was superior to the other lines. Under water deficit condition, line 14 had greater grain yieldby20% and 38% than the Bahman and Makouee cultivars, respectively. The results showed that greater grain yield in tolerant lines under water deficit was due to remobilization of unstructured carbohydrates from shoot to grain.Thus, it seems that selection of lines with higher translocated dry matter and contribution of pre-anthesis assimilate in grain filling under water stress, the suitable way for achieving genotypes with high grain yield under water stress condition.
Źródło:
Plant Breeding and Seed Science; 2013, 68; 65-75
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relation of actual to potential evapotranspiration as an indicator of plant water stress for meadow plant cover
Autorzy:
Baranowski, P.
Mazurek, W.
Walczak, R.T.
Powiązania:
https://bibliotekanauki.pl/articles/1402606.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
root system
temperature measurement
soil water
thermography
meadow
crop water stress
evapotranspiration
plant cover
Penman-Monteith method
water stress
plant
Źródło:
Acta Agrophysica; 2001, 53
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dendrometric evaluation of Helianthus annuus under water deficit conditions
Autorzy:
Obročník, Oliver
Bárek, Viliam
Powiązania:
https://bibliotekanauki.pl/articles/28411641.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
dendrometer
drought
Helianthus annuus
irrigation
water deficit
water stress
Opis:
Drought is characterised as a recurring climatic phenomenon with prolonged duration, affecting land through below-average rainfall and often accompanied by high temperatures. When the available water falls below the optimum level, water deficit or water stress arises, disrupting normal plant processes. This condition poses challenges for plant growth and development as it hampers the internal water transport, induces stomatal closure, and limits access to photosynthetic resources. The study employed the annual sunflower as the experimental plant. The plants were cultivated in a controlled environment with a temperature ranging from 20 to 25°C and a humidity level of 55 to 60%, supplemented by MARS HYDRO artificial LED lighting set to a 12-h photoperiod. Radial changes in the plant stems were monitored using a DD-S type dendrometric sensor to measure radial fluctuations. The collected data were recorded in a dendrometric data logger DL 18. Data collection occurred at hourly intervals from February 20 to March 9, 2023. The nine plants were divided into three groups, each comprising three plants. All plants from groups 1 and 2 received irrigation at one-day intervals (group 1 - 80 cm3 per plant, group 2 - 40 cm3 per plant) and group 3 was not irrigated. Based on these findings, visible water stress was evident in the plants under experimental conditions. Consequently, continuous monitoring throughout the growing season will be essential to adjust the irrigation rate to meet the requirements of the plants.
Źródło:
Journal of Water and Land Development; 2023, 59; 50--53
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defining Irrigation Scheduling Based on Crop Water Stress Index and Physiological Parameters for Hybrid Corn in Semi-Arid Climate
Autorzy:
Ucak, Ali Beyhan
Saltuk, Burak
Rolbiecki, Roman
Atilgan, Atilgan
Powiązania:
https://bibliotekanauki.pl/articles/2174923.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
corn
crop water stress index
irrigation time
correlation
Opis:
The goal of this study is to determine the crop water stress index (CWSI) and irrigation scheduling based on CWSI values, as well as to examine the correlations between CWSI, physiological parameters and grain yield of hybrid corn P31A34 in semi-arid climate conditions. In 2014 and 2015, the upper limit (UL) temperatures at which plants were entirely exposed to water stress were 1.178°C and 2.38°C, respectively. When the corn grain yield began to decline, the CWSI threshold value was 0.34, indicating the yield limit. Grain yield, crop water consumption, crop water stress index, chlorophyll content, water use efficiency and leaf area index were found to have negative correlations (p ≤ 0.01) with CWSI values in both years of the study. The findings revealed that in semi-arid climate conditions, a maximum of 30% water deficit could be used during the growing period of the corn compared to full irrigation (I100) for water savings and that a water deficit greater than 30% results in considerable grain yield losses. In areas with limited water resources, the moderate water deficit (I70) may be a viable alternative to the I100.
Źródło:
Rocznik Ochrona Środowiska; 2022, 24; 231--245
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water (in) security – modern security paradigm
Autorzy:
Prebilič, Vladimir
Powiązania:
https://bibliotekanauki.pl/articles/1199401.pdf
Data publikacji:
2019-06-30
Wydawca:
Uniwersytet Gdański. Instytut Geografii
Tematy:
water security
national security
drinking water
water footprint
water stress
water consumption
Opis:
Water. In the existence and activities of each individual it is water that (un) consciously essentially defines them. Therefore, water is called the source of life, but nowadays we know it under the new concept: blue gold. The reason for such a modern understanding of the role of water lies in the increasing limitations of access to sufficient quantities, which first results in water stress – the situation where needs remain unmet, but water scarcity does not yet interfere with the foundations of the activities of societies. Water stress is thus the first form of threat to water security, especially when deficiency destroys all basic social systems that cannot function without water. The question of the role of water between them is increasingly being raised, as the operation of one system in the area of water consumption or management can mean interfering with the water potential of another system. This confronts us with the effect of the definite quantities of water, although countries with ample water resources and quantity (still) often do not understand or perceive it. Of course, this does not mean that the debate is not necessary; it is, conversely, necessary, and it is only in this way that it is possible to prevent or at least control the situation in which many countries around the world have found themselves and there is a total lack of water resources in the most existential aspects. Under these conditions, water security has become the most essential element of national security of these countries and thus a potential weak link in ensuring security.
Źródło:
Journal of Geography, Politics and Society; 2019, 9, 2; 1-9
2084-0497
2451-2249
Pojawia się w:
Journal of Geography, Politics and Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of silicon in plant resistance to water stress
Rola krzemu w odpornosci roslin na stres wodny
Autorzy:
Sacala, E
Powiązania:
https://bibliotekanauki.pl/articles/13900.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
silicon
plant resistance
water stress
plant growth
environmental factor
Opis:
Agricultural productivity is strongly affected by different abiotic stresses, among which water stress is the major environmental constraint limiting plants growth. The primary reason for water stress is drought or high salt concentration in soil (salinity). Because both of these stress factors lead to numerous physiological and biochemical changes in plants and result in serious loss in yields, there is a pressing need for finding the effective ways for increasing crops’ resistance to stress factors. One of the alternative methods involving alleviation of negative stress effects might be application of silicon as a fertiliser (root or foliar supply). Many plants, particularly monocotyledonous species, contain large amounts of Si (up to 10% of dry mass). In spite of the high Si accumulation in plants (its amount may equal concentration of macronutrients), until now it has not been considered as an essential element for higher plants. Many reports have shown that silicon may play a very important role in increasing plant resistance to noxious environmental factors. Hence, Si is recognised as a beneficial element for plants growing under biotic and abiotic stresses. The main form of Si which is available and easily taken up by plants is monosilicic acid (H4SiO4). Plants take up Si from soil solution both passively and actively. Some dicotyledonous plants such as legumes tend to exclude Si from tissues – rejective uptake. These plants are unable to accumulate Si and they do not benefit from silicon. Under water stress conditions, silicon might enhance plants’ resistance to stress and ameliorate growth of plants. These beneficial effects may result from better and more efficient osomoregulation, improved plant water status, reduction in water loss by transpiration, maintenance of adequate supply of essential nutrients, restriction in toxic ions uptake and efficient functioning of antioxidative mechanisms. Based on the current knowledge and presented data, it can be concluded that the role of Si in plants is not restricted to formation of physical or mechanical barrier (as precipitated amorphous silica) in cell walls, lumens and intercellular voids. Silicon can also modulate plants’ metabolism and alter physiological activities, particularly in plants subjected to stress conditions. However, in some plants, increased silicon supply does not improve plant growth. Hence, a better understanding of the interactions between silicon application and plant responses will contribute to more efficient fertiliser practices, especially under stress conditions.
Produktywność roślin uprawnych jest w znacznym stopniu ograniczana przez różne abiotyczne czynniki stresowe, wśród których stres wodny jest jednym z głównych problemów, na który narażone są rośliny. Stres wodny najczęściej jest spowodowany suszą glebową lub nadmiernym zasoleniem gleb. Ponieważ te czynniki powodują liczne fizjologiczne i biochemiczne zmiany w roślinach oraz prowadzą do poważnych strat plonów, konieczne jest znalezienie skutecznych sposobów zwiększenia odporności roślin na stresy. Jednym ze sposobów pozwalających na złagodzenie ujemnych skutków stresu wodnego może być zasilanie roślin krzemem (w formie oprysku lub dodatku do podłoża). Wiele roślin, szczególnie jednoliściennych, zawiera duże ilości krzemu (do 10% s.m.). Pomimo że procentowa zawartość krzemu w roślinach może dorównywać zawartości makroelementów, to nie jest on uznawany za pierwiastek niezbędny do prawidłowego wzrostu i rozwoju roślin. Wyniki wielu badań wskazują jednak na ważną rolę krzemu w podnoszeniu odporności roślin na różne niekorzystne czynniki środowiska. Dlatego krzem jest uważany za pierwiastek wpływający korzystnie na rośliny, szczególnie poddane działaniu abiotycznych i biotycznych czynników stresowych. Główną formą krzemu dostępną dla roślin i łatwo przez nie pobieraną jest kwas ortokrzemowy (H4SiO4). Może on być pobierany z roztworu glebowego w sposób pasywny lub aktywny. Niektóre rośliny (głównie motylkowate) wykluczaj¹ krzem ze swoich tkanek (ang. rejective uptake). Rośliny te nie mają zdolności akumulowania tego pierwiastka, i w związku z tym nie mogą doświadczać jego korzystnego działania. W warunkach stresu wodnego krzem może zwiększać odporność roślin oraz poprawiać ich wzrost. Ten pozytywny wpływ może wynikać z: lepszej i bardziej sprawnej osmoregulacji, lepszego statusu wodnego, ograniczenia strat wody w procesie transpiracji, odpowiedniego zaopatrzenia w składniki mineralne, ograniczenia pobierania toksycznych jonów oraz sprawnego funkcjonowania mechanizmów antyoksydacyjnych. Opierając się na obecnym stanie wiedzy i przedstawionych danych, można stwierdzić, że rola krzemu nie ogranicza się jedynie do tworzenia mechanicznej lub fizycznej bariery (w postaci amorficznej krzemionki) w ścianach komórkowych, przestrzeniach międzykomórkowych oraz wewnątrz komórek. Pierwiastek ten może wpływać na metaboliczną i fizjologiczną aktywność roślin, szczególnie tych, które narażone są na niekorzystne wpływy środowiskowa. Jednakże w przypadku niektórych roślin nie stwierdzono pozytywnego wpływu krzemu na ich wzrost. Dlatego zrozumienie interakcji między zastosowaniem krzemu a reakcją roślin na ten pierwiastek przyczyni się do bardziej efektywnego nawożenia roślin, szczególnie w warunkach stresowych.
Źródło:
Journal of Elementology; 2009, 14, 3; 619-630
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological threats to security and state resilience in Afghanistan
Autorzy:
Gauster, Markus
Powiązania:
https://bibliotekanauki.pl/articles/1194402.pdf
Data publikacji:
2021
Wydawca:
Akademia Sztuki Wojennej
Tematy:
climate change
Afghanistan
crisis management
water stress
human security
Opis:
This work explores ecological and climate-related threats to Afghanistan and discusses support approaches from a European Crisis Management (ECM) perspective. It goes beyond the much-debated troop withdrawal, COVID-19 crisis and peace negotiations and opens an underestimated topic: ‘Climate Change Assistance’. The article aims to advance knowledge on the effects of climate change on human security in Afghanistan and advocates a conflict-sensitive approach. To this end, a climate-related assessment of the human security situation was undertaken and several threat scenarios, options and solutions for enhancing state resilience were developed. The bases for this research were several field trips undertaken by the author since 2004, workshops and an extensive literature review. As a result, it can be stated that the negative impacts of climate change and pollution on Afghanistan’s security and development architecture are massive and make ECM efforts very complex. However, several capacity-building initiatives for military, diplomatic, humanitarian and local stakeholders were identified. On the regional level, this includes the support for early warning systems and hydro-diplomacy with Pakistan, Iran and India. On the local level, the support for community water management and environmental protection matters, while building upon traditional Afghan mechanisms for handling water crises or disasters. Another outcome is the need for more in-depth research in this field as some findings are also useful for other fragile states. The paper argues that there is an urgent need for ECM to respond to the devastating effects of climate change in Afghanistan and identifies several smart opportunities to tackle some root causes of the conflict.
Źródło:
Security and Defence Quarterly; 2021, 33, 1; 31-40
2300-8741
2544-994X
Pojawia się w:
Security and Defence Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Securitization of Water in Central Asia: Insights from the Regional Water Security Complex
Autorzy:
Musioł, Marek
Powiązania:
https://bibliotekanauki.pl/articles/31343163.pdf
Data publikacji:
2024-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
water security
water stress
water scarcity
Regional Water Security Complex
securitization
Central Asia
Opis:
Central Asia is revealing itself as an area where the problem of access to water and its current regional dynamics are almost at a radically critical level, where the potential risk of water disputes is still one of the highest in the world. Therefore, water scarcity issues and challenges triggered by the Aral Sea syndrome, the existing water mismanagement system, infrastructural and investment projects of dams and water reservoirs (Rogun, Naryn, Kambarata, Toktogul, etc.) and their transformation towards an existential threat will be analyzed within the securitization prism through the selected speech acts. This article will contribute to developing a new analytical framework of Regional Security Complex Theory (RSCT) and the securitization theory in water stress. The efforts undertaken in this article will ultimately lead to the development of a new approach to issues of water security and hydro politics within the concept of the Regional Water Security Complex (RWSC) on the example of the Central Asian region. The main research question will be to what extent water, as an immanent feature of this complex, is politicized and securitized. An important question will also be how the formulated security language indicates the existential nature of water as a security problem in the region.
Źródło:
Polish Political Science Yearbook; 2024, 1(53); 191-205
0208-7375
Pojawia się w:
Polish Political Science Yearbook
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of kaolin and Bordeaux mixture in Vitis vinifera under water stress conditions: oxidative stress
Autorzy:
Dias, M.
Jesus, C.
Pinto, G.
Santos, C.
Goncalves, B.
Goncalves, D.
Malheiro, A.
Correia, C.
Moutinho-Pereira, J.
Powiązania:
https://bibliotekanauki.pl/articles/80420.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
kaolin
Bordeaux mixture
Vitis vinifera
water stress
oxidative stress
grape-vine
plant stress
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of salt and water stresses on growth, nitrogen and phosphorus metabolism in Cucumis sativus L. seedlings
Autorzy:
Sacala, E
Demczuk, A.
Grzys, E.
Spiak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/57642.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
salt stress
seedling
nitrogen
growth
salinity
Cucumis sativus
cucumber
osmotic stress
water stress
phosphorus
Opis:
Plants exposed to osmotic stress exhibit changes in their physiology and metabolism. In general, osmotic stress reduces water availability and causes nutritional imbalance in plants. In the present study, we compared the response of cucumber (Cucumis sativus L. var. Władko F-1) to ionic (100 mmol•dm-3 NaCl) and osmotic stress (10% PEG 6000). Both stress factors reduced significantly fresh and dry weight of 7-day-old cucumber seedlings. Under PEG treatment reduction of cucumber dry mass was lesser than in fresh mass, whereas under salt stress decrease in dry weight of cucumber shoots was more pronounced than in fresh mass. Salt stress caused severe decrease in nitrate concentration and activity of nitrate reductase (NR). In cotyledons nitrate content declined to 17% of the control and similar reduction in NR activity was observed. In the roots, observed changes were not so drastic but there was also strong interaction between reduction in nitrate content and NR activity. Under 10% PEG both nitrate concentration and NR activity in cucumber roots were significantly higher in comparison to control plants. In cotyledons NR activity was significantly lower than in control plants, while decrease in nitrate content was not statistically significant. Phosphate concentration did not change significantly in cucumber cotyledons but increased in roots treated both NaCl (32% increase) and PEG (53% increase). Similar tendencies were observed in acid phosphatase activity. Obtained results indicated that osmotic and salt stresses evoke differential responses, particularly in growth reduction and nitrogen metabolism in cucumber seedlings.
Źródło:
Acta Societatis Botanicorum Poloniae; 2008, 77, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water Deficit as a Security Threat
Autorzy:
Sakson-Boulet, Anna
Powiązania:
https://bibliotekanauki.pl/articles/642011.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
water security
water stress
water deficit
water conflict
natural resources
ecological security
environmental security
Opis:
The aim of the article is to explain the key definitions connected with water security and to analyse state relations in the context of water issues. In this context therefore water can be seen to be a precious resource because there it has no substitute. Thus the lack of water security is emerging as one of the major barriers for economic and social growth in developing countries and a source of domestic conflicts. On the other hand, water-related events might result in international cooperation, as Kofi Annan noticed during the celebration of World Water Day: “Fierce national competition over water resources has prompted fears that water issues contain the seeds of violent conflict. [...] If all world’s peoples work together, a secure and sustainable water future can be ours”. What is certain, in the near future any environmental security planning will have to take into consideration the prime issue of water security.
Źródło:
Przegląd Strategiczny; 2016, 9; 239-251
2084-6991
Pojawia się w:
Przegląd Strategiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of maize and black gram yield and water productivity to variations in canopy temperature and crop water stress index
Autorzy:
Khorsand, A.
Rezaverdinejad, V.
Asgarzadeh, H.
Heris, A.M.
Rahimi, A.
Besharat, S.
Powiązania:
https://bibliotekanauki.pl/articles/2082909.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
canopy temperature
crop yield
CWSI
phenolic
and flavonoid compounds
water stress
Opis:
In order to evaluate the ability of the crop water stress index to estimate grain yield and water productivity of maize and black gram in the climatic conditions of Urmia (Iran), research was conducted under the conditions of single-row drip irrigation. This study was conducted in a randomized complete block design with four irrigation levels including 50 (I1), 75 (I2), 100 (I3) and 125 (I4) percent of the water requirements of the plants with three replications. The mean crop water stress index values for the I1, I2 and I3 treatments were 0.53, 0.44, and 0.28, respectively during the growth period of maize, and 0.37, 0.23, and 0.15 for black gram, respectively. In the present study, the correlation between the crop water stress index and the grain yield and also the water productivity of maize and black gram was high. According to the results, the highest grain yield for maize and black gram was obtained at crop water stress index values of 0.28 and 0.15, respectively. Therefore, these values are recommended for the irrigation scheduling of the plants. It should be noted that the maximum water productivity index for maize and black gram was obtained at crop water stress index values of 0.44 (I2) and 0.37 (I1), respectively, which are the values recommended for irrigation scheduling under restricted access to water.
Źródło:
International Agrophysics; 2020, 34, 3; 381-390
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 100

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