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    Wyświetlanie 1-7 z 7
    Tytuł:
    Desertification: on significance of the term and research of the phenomenon
    Autorzy:
    Plit, Florian
    Miłaszewska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2032489.pdf
    Data publikacji:
    2006-06-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    desertification
    definitions
    regional analysis
    Opis:
    First elaborations on desertification come from the Renaissance, but the term was used for the first time by Aubreville in 1949. In later years, many significantly varying in meaning definitions were elaborated. In later periods, researchers' attention concentrated on different areas. At the turn of the XIXth century, interest was mainly focused on Asia, later on the peripheries of the Sahara, in recent years on desertification in post-soviet Central Asia, China and Mongolia.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2006, 12; 147-153
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Desertification detected in the Udhaim River Basin, Iraq. Based on Spectral Indices Derived from Remote Sensing Images
    Autorzy:
    Mail, Abd Al Salam Mohammed
    Powiązania:
    https://bibliotekanauki.pl/articles/2108226.pdf
    Data publikacji:
    2017-10-04
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    Desertification
    GIS
    remote sensing
    spectral indices
    Iraq
    Opis:
    In this study, changes in Land Use Land Cover (LULC) have been investigated over the Udhaim River Basin in Iraq by using spectral indices. NDVI, NDBI, NDWI, NDBaI, and CI represent respectively the vegetation, built-up, water bodies, bare-land, and soil crust of LULC. Two different images were acquired for the analysis, namely a Landsat 5 TM image from 1 July 2007 and a Landsat 8 OLI from 5 June 2015, both representing summer conditions. Results show that the percentages of vegetated land and water body areas have decreased. On the contrary, the percentages of built-up, bare land and soil crust areas have increased. The loss of vegetated areas and water body areas is a signal of land degradation leading to desertification, due to the combined effects of climate conditions, water deficit and human activities. Field observation shows that human activities have a significant impact on land degradation.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2017, 21, 3; 124-131
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in the environment and migration in southern Morocco - example of the Mhamid Oasis
    Autorzy:
    Sobczak, Karolina
    Fulara, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/2030328.pdf
    Data publikacji:
    2008-06-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    Morocco
    migrations
    desertification
    Mhamid
    Oued Dra
    Opis:
    The subject of the article is an analysis of changes in the environment and economy of oases in southern Morocco, on the basis of a case study of Mhamid. The conclusions are that water investments carried out in the Draa Valley intensified the desertification process. This is exemplified by a stronger aeolian deflation, worsening living conditions of the population, limiting of arable areas and finally, migration. Paradoxically, because of desertification, the region has a chance to develop economically because the newly created sand dunes fields stimulate development of tourism.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2008, 13; 239-250
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impacts of Deforestation on the Spread of Mastomys natalensis in Nigeria
    Autorzy:
    Adetola, O. O.
    Adebisi, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1066303.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Biodiversity
    Deforestation
    Desertification
    Habitat destruction
    Lassa fever
    Mastomys natalensis
    Opis:
    Lassa fever is an acute viral disease that is endemic in West African countries of Nigeria, Liberia, Sierra Leone and Guinea. Since the first case was reported in Lassa town Nigeria in 1969, Mali 2009, Ghana in late 2011 and serological evidences of the virus was reported in Togo and Benin in 2014 the virus has assumed an endemic proportion in West Africa. Deforestation which is the deliberate disruption of the natural forest ecosystem has been implicated as a major cause of the virus holding to the fact that the natural habitats of the rodent host have been tampered and hence they seek refuge in human homes. Most research work have been centered on the epidemiology ,hygiene and mode of transmission of the zoonotic virus without critical consideration of habitat destruction of this rodents that negate their relocation to human homes in search of food and alternative shelter. This review article aims to raise awareness on the urgent need to control deforestation acts in order to prevent further outbreak of Lassa fever.
    Źródło:
    World Scientific News; 2019, 130; 286-296
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forest in Karst Mountain sinkhole of southeastern China provides refugium for the preservation of bryophyte diversity
    Autorzy:
    Li, X.
    Zhang, Z.
    Wang, Z.
    Shi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130582.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    negative landform
    natural refuge
    complex microenvironment
    karst rocky
    desertification
    Opis:
    The negative landform of sinkholes provides belowground level refugia for a high diversity of forest species compared to the forests on the surface of surrounding karst plateaus in southeastern China. Bryophyte diversity in sinkhole forests is also likely to be high. In this study, bryophytes of an underground forest sinkhole (UFS), and two forests (Forest Karst Mountain 1; FKM1) and (Forest Karst Mountain 2; FKM2) on the surface of the karst plateau were compared to understand the role of the sinkhole forest in the conservation of bryophyte diversity and the relationships between bryophyte diversity, environmental factors, and soil nutrients. Significantly more bryophyte taxa were recorded from the sinkhole forest (71 taxa, 36 genera, 23 families) than those in the forest on the plateau surface, which was the closest to the sinkhole (FKM1; 29 bryophyte taxa, 16 genera, 12 families), and even fewer bryophytes were found in the forest more distant to the sinkhole (FKM2; 22 taxa, 17 genera, eight families). Twenty-four liverwort taxa were collected from the sinkhole forest, two from the closest surface forest (FKM1) and none from the furthest surface forest (FKM2). Ninety-three percent of the bryophytes in karst mountain sinkhole were not found on surface forest. The diversity index trend was as follows: UFS > FKM1 > FKM2, and the evenness index trend was in the opposite direction as follows: UFS < FKM1 < FKM2. The beta diversity showed that the Jaccard index among the three forests was 0–0.25, reflecting a huge difference between the sinkhole forest and the two surface forests. Canonical correspondence analysis showed that light was the most important factor affecting the distribution of bryophytes in the sinkhole forest, while temperature and humidity were key factors for the distribution of bryophytes in the two surface forests. Further, soil parameters, namely, soil organic carbon, total nitrogen, total phosphorus, total potassium, alkali- hydrolyzed nitrogen, and available phosphorus changed gradually from UFS to FKM1 and to FKM2. The sinkhole forest, located in a landform with the unique negative topography enclosed by cliffs, and with a complex microenvironment, provides a natural refuge for bryophyte species in areas where forests have been negatively impacted by karst rocky desertification.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2020, 89, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment and mapping of desertification sensitivity with MEDALUS model and GIS – Case study: basin of Hodna, Algeria
    Ocena i mapowanie wrażliwości pustynnienia za pomocą modelu MEDALUS i GIS – Studium przypadku: dorzecze Hodna, Algieria
    Autorzy:
    Boudjemline, F.
    Semar, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/292843.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    Algeria
    desertification
    ESAI
    Hodna River basin
    MEDALUS
    soil sensitivity
    Algieria
    basen rzeki Hodna
    indeks ESA
    pustynnienie
    wrażliwość gleb
    Opis:
    In Algeria, desertification risk is one of the main environmental and also social and economic problems. As much as 20 million hectares of northern Algeria are highly exposed and vulnerable to desertification with large areas falling into his ‘severe’ risk category, because the present massive destruction of vegetation and soils. This study aimed to use geographic information system (GIS) for mapping environmentally sensitive areas to desertification based on Mediterranean Desertification and Land Use (MEDALUS) approach in basin of Hodna, Algeria. Sensitivity is estimated with a modification of the MEDALUS environmentally sensitive area index (ESAI) which identifies such areas on the basis of an index (ESAI) that incorporates data on environmental quality (climate, vegetation, soil) as well as anthropogenic factors. This methodology allows the classification of land in critical, fragile and potentially sensitive areas. The results obtained show that 61% of the area is classified potentially sensitive to low sensitivity. These areas are particularly located in mountain areas. Spatially, the areas sensitive to degradation are as well in the lower region of the Hodna in Highlands consisting mostly of steppe route. The factors that could explain these variations of sensitivity are related mainly to changes in precipitation between the North and the South altitude and pressure of the population and livestock.
    Ryzyko pustynnienia jest jednym z głównych problemów środowiskowych, ale także problemem społecznym i ekonomicznym. Aż 20 mln ha w północnej Algierii zagrożonych jest pustynnieniem, a na znacznych obszarach zagrożenie występuje w stopniu poważnym z powodu niszczenia roślinności i gleb na masową skalę. W badaniach wykorzystano system informacji geograficznej GIS i model MEDALUS (ang. – MEditerranian Desertification And Land USe) i zastosowano je w odniesieniu do basenu Hodna w Algierii. Wrażliwość oceniano z zastosowaniem zmodyfikowanego indeksu środowiskowej wrażliwości obszaru (ESAI), który uwzględnia dane o jakości środowiska (klimat, roślinność, gleba) oraz czynniki antropogeniczne. Ta metoda umożliwia klasyfikację obszarów na: krytycznie zagrożone, słabo i potencjalnie wrażliwe. Uzyskane wyniki dowodzą, że 61% badanego obszaru to ziemie potencjalnie wrażliwe lub o niskiej wrażliwości. Są to głównie tereny górzyste. Obszary wrażliwe na degradację znajdują się także w niżej położonych regionach Hodna o cechach stepu. Czynnikami, które objaśniają zmienność wrażliwości na pustynnienie, są różnice w opadach pomiędzy północą a południem oraz presja ludności i zwierząt inwentarskich.
    Źródło:
    Journal of Water and Land Development; 2018, 36; 17-26
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of Pigeon pea (Cajanus cajan) for drought mitigation in Nigeria
    Autorzy:
    Emefiene, M.E.
    Salaudeen, A.B.
    Yaroson, A.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/11437.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    pigeon pea
    Cajanus cajan
    Gandule bean zob.pigeon pea
    tropical green pea zob.pigeon pea
    kadios zob.pigeon pea
    Congo pea zob.pigeon pea
    gungo pea zob.pigeon pea
    drought
    mitigation
    desertification
    vulnerability
    Opis:
    Drought poses one of the most important environmental constraints to plant survival and productivity and by implication-food insecurity in the tropics. Pigeon pea (Cajanus cajan) has the potential of fertilizing the soil thereby improving agricultural production and ensure green environmental and ecosystem stability. Despite the ability of the plant to improve soil fertility and promote greening environment, it has not attracted adequate awareness as a soil improvement plant. This paper highlights the information on the plant in order to intensify awareness for its widespread adoption to achieve the much desired sustainable resource use for greening our economy and environmental management. The successful widespread adoption of the plant will translate to effective drought, desertification and sustainable climate change mitigation approach in Nigeria.
    Źródło:
    International Letters of Natural Sciences; 2013, 01
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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