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Tytuł:
Species conversion of spruce stands in the Wisła Forest District
Autorzy:
Skrzyszewski, J
Skrzyszewska, K.
Powiązania:
https://bibliotekanauki.pl/articles/41743.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Wisla Forest District
spruce
Picea abies
Istebna spruce
seed stand
spruce stand
forest tree
species conversion
Opis:
The paper provides some guidelines on the choice of the target species compositions for plantations that would replace monocultural spruce stands growing on the sites of the Silesian Beskid Mts. Part of the guidelines relates to the rules governing the sequence in which the monocultures will be converted into mixed stands. It is suggested that those rules should be combined with the principles of the establishment of progenyplantations. The seed stands of the Istebna spruce are experimentally divided into four categories according to their abilityto perform the function of a seed stand. The following features of the stands are analysed: vitality, density, stage of regeneration, protective and cultural functions. The paper contains also an outline of the methods of species conversion and the relevant references.
Źródło:
Dendrobiology; 2004, 51 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diversity of spruce ectomycorrhizal morphotypes in four mature forest stands in Poland
Autorzy:
Karlinski, L
Kieliszewska-Rokicka, B.
Powiązania:
https://bibliotekanauki.pl/articles/41194.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Polska
air pollution
mature forest stand
forest stand
ectomycorrhizal diversity
Picea abies
Norway spruce
forest type
environment pollution
soil
Opis:
Ectomycorrhizal communities structure of Norway spruce (Picea abies L. (Karst.) was studied in four mature forest stands: Brenna, Salmopol, Zwierzyniec and Mirachowo. Morphological classification was used to distinguish the major mycorrhizal types associated with spruce in different forest types. Three of the foreststands were located within the natural geographical range of Norway spruce (Brenna, Salmopol, Zwierzyniec) and one (Mirachowo) was located in so-called “spruce-less zone”. The sites differed in terms of environmental pollution. The mountain sites (Brenna, Salmopol) were characterized by relatively high levels of air pollution. The upland forest stand (Zwierzyniec), located in the southeastern part of Poland, was affected by a moderate pollution. The lowland stand in northern Poland (Mirachowo) was free from direct impact of anthropogenic pollution. The level of mycorrhizal colonization was 100% at all the study sites. Thirty-seven mycorrhizal morphotypes were distinguished in total. The number of ectomycorrhizal morphotypes varied between sites from 12 in Salmopol to 28 in Zwierzyniec. From one to three dominant morphotypes were found at the study site. Site-specific morhotypes were also observed. The frequency of mycorrhizal morphotypes differed between the forest stands.
Źródło:
Dendrobiology; 2004, 51; 25-35
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The radial growth-competition relationship in Picea abies stands affected by windfall
Autorzy:
Badea, O.
Dumitru, I.
Cojocia, C.
Popa, I.
Powiązania:
https://bibliotekanauki.pl/articles/41406.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Norway spruce
stand
Picea abies
windfall
risk factor
Opis:
Actual status of mountain forests especialy, of Norway spruce (Picea abies Karst. (L)) stands is a result of combined action between forest management measures and biotic and abiotic risk factors. In this context, tree growth dynamics is a result of multifactor interaction (competition, disturbance, management practice, climate etc.). Wind damage affect the stand structure and normal ecosystem functions including the relationship between individual tree growth and competition processes. Though, it is recorded a diminishing of productive capacity for affected stands as well as a significant diameter increment for remaining standing trees. The correlation between tree growth (cumulate basal area increment in the last 10 years) and competition (Hegyi and Schutz competition indices) was analysed in stands with different windfall intensity. No relationship between tree growth and competition was observed in highly affected stands. Schutz competition index explains better individual tree growth comparing with Hegyi index in low or no-affected stand by windthrow. The variability of the basal area increment (lnΔɡ10), explained by competition indices, is rather low (<2%) in the stand that had been highly affected by windfall, regardless of the selected competition index. Thus, significant reduction of the stand density related to number of trees (low density), as a consequence of high intensity windfalls, crown competition has a very small influence on the basal area increment comparing with situations met in low (high density) and moderate (medium density) affected stands.
Źródło:
Dendrobiology; 2015, 73
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural diversity and production of alder stands on former agricultural land at high altitudes
Autorzy:
Vacek, Z.
Vacek, S.
Podrazsky, V.
Kral, J.
Bulusek, D.
Putalova, T.
Balas, M.
Kalouskova, I.
Schwarz, O.
Powiązania:
https://bibliotekanauki.pl/articles/41581.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
structural diversity
stand structure
alder stand
agricultural land
black alder
Alnus glutinosa
grey alder
Alnus incana
afforestation
succession
Sudetes Mountains
Opis:
The paper deals with the structural diversity and production of a less frequently studied type of alder stands originated on former agricultural lands in the 1950s, established partly by plantation and partly by natural succession in the area of the Krkonoše Mts. and the Orlické hory Mts. (Czech Republic). Four permanent research plots (PRP) were established at sites where Black alder (Alnus glutinosa L. Gaertn.) and Grey alder (Alnus incana L. Moench.) naturally occurs, each plot of 0.25 ha in size. The aim of the study was to evaluate the structure and development of the alder stands with respect to biodiversity, horizontal, vertical and species structure, diameter increment with emphasis on climate factors, and the quantity and quality of timber production. The results document low diversification of the studied stands in the PRPs. The horizontal structure is defined as random and clumped at sites at the highest altitude with high water table. The number of living trees with DBH ≥ 4 cm ranges between 556 to 828 trees ha-1 with the relative stand density index (SDI) 0.67–0.77. The stand volume ranges from 247 to 393 m3 ha–1, and decreases with higher altitudes. Low temperatures is limiting factor for radial growth in the high mountain areas, respectively low precipitation in the middle lands. Owing to a rather specific site character, as especially the spring area, the stands exhibit only average production, but the production quality is generally high. The quality timber is suitable for industrial use; the rot-affected trunk base parts usable for fuel represent only approximately 16%.
Źródło:
Dendrobiology; 2016, 75
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of fungal pathogens and climatic factors on production, biodiversity and health status of ash mountain forests
Autorzy:
Vacek, Zdeněk
Vacek, Stanislav
Bulušek, Daniel
Podrázský, Vilém
Remeš, Jiří
Král, Jan
Putalová, Tereza
Powiązania:
https://bibliotekanauki.pl/articles/957002.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
fraxinus excelsior
ash dieback
stand structure
dynamics
central europe
Opis:
European ash (Fraxinus excelsior L.) is a broad-leaved fast-growing tree species common in most parts of Europe, highly-valued for its ecological properties and occurrence in many forest site types. Its future is threatened, especially by an invasive fungal pathogen Hymenoscyphus fraxineus causing disintegration of E. ash stands throughout all Europe. This paper deals with changes in stand structure, biodiversity and production parameters in mixed European ash stands in the Krkonoše Mountains National park, Czech Republic, with respect to ash dieback progress for period 2009–2015. Studied four permanent research plots (0.25 ha) showed negative dynamics of stand structural and production parameters. Volume of ash ranged between 98–376 m3 ha–1 (stand volume 378–613 m3 ha–1), which indicates a decrease by 2.7% during 6 years. Detected fungi caused mean deterioration of foliage by 22.9%, canopy by 15.8% and mortality reached 15.2%. The earlier ash dieback symptoms were detected at suppressed and intermediate trees, especially on waterlogged sites and at low altitude. Conversely, ash dieback was reflected less intensively at higher-elevated sloping stands, although low temperature (particularly severe frosts at the beginning of the year) was prevailing limiting factor for radial growth of ash in these mountain areas. The biodiversity indices of tree layer indicate mostly medium values with a decreasing tendency (to 22.4%). Relationship between spatial pattern of trees without dieback symptoms and infected trees was positive at small distances (to 7 m) or random. In terms of preventive silvicultural practices, strong systematic thinning is recommended to maintain the vitality of ash stands.
Źródło:
Dendrobiology; 2017, 77; 161-175
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the biomass of Pinus mugo stands
Autorzy:
Spinlerova, Z.
Powiązania:
https://bibliotekanauki.pl/articles/41349.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
biomass
determination
Pinus mugo
stand
dwarf pine
Czech Republic
Opis:
The dwarf pine stands on unoriginal sites in mountainous areas of the Czech Republic are a current topic of scientific discussion. One of these sites is on the summits of the Hrubý Jeseník Mts. Various proposals for dwarf pine removal have been hindered by the absence of charts or tables that could be used to calculate how much biomass would need to be removed. Therefore, we created a methodology for dwarf pine biomass determination and applied it to five research transects of different ages. Based on the biomass estimates, we created trend curves illustrating the increase in biomass (dependent on age) as well as equations that could be used to roughly estimate the biomass of any dwarf pine stand, regardless of age or canopy level, for sites above the timberline in Hrubý Jeseník Mts. The equations for biomass calculations could also be applied to other mountain ranges where artificially planted dwarf pines of the same seed origin or the same morphological appearance as those existing in the Hrubý Jeseník Mts. are found.
Źródło:
Dendrobiology; 2015, 73
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality of Japanese larch stands in Poland
Autorzy:
Filipiak, M
Pilarek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/41203.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
forest productivity
forestry
stand
Larix kaempferi
Polska
acclimation
Japanese larch
Opis:
The quality of 39 Japanese larch stands, mainly in north-western Poland, was characterized. On the basis of the presented results it can be concluded that properly managed forest stands of Japanese larch can compete in trees quality with stands of native larches. The alien species is more susceptible to a lower stand density and exposure to strong winds. This is no correlation between forest stand quality and growth dynamics.
Źródło:
Dendrobiology; 2003, 49
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of tree diversity and stand structure on above-ground carbon storage in evergreen broad-leaved and deciduous forests in Southeast Vietnam
Autorzy:
Tuan, N.T.
Rodriguez-Hernandez, D.I.
Tuan, V.C.
Quy, N.V.
Obiakara, M.C.
Hufton, J.
Powiązania:
https://bibliotekanauki.pl/articles/2130199.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Biodiversity assessment
Ecosystem functioning
Taxonomic diversity
Natural forests
Stand structure
Opis:
Understanding the relationship between tree species diversity and above-ground carbon (AGC) storage in tropical forests is essential for a sustainable flow of ecosystem goods and services. Although tropical forests of Vietnam are of particular interest due to their high biodiversity and carbon density, few studies have evaluated the relative importance of species composition, tree species diversity and forest structure on AGC storage by forest vegetation type. In this study, we tested for the influence of taxonomic diversity, forest structure and species composition on AGC storage in evergreen broad-leaved and deciduous forests of Southeast Vietnam. Data was collected within 137 rectangular plots (25 m × 20 m), randomly selected across a deciduous forest (DF) and four evergreen broad-leaved forest (EB) categories, with different standing volumes levels: very poor (EBG), poor (EBP), medium (EBM) and rich (EBR). In total, we identified 3687 individuals from 110 tree species belonging to 46 families in 6.85 hectares of sampled area. AGC storage significantly differed among forest categories, ranging from 14.81 Mg ha−1 in EBG to 146.74 Mg ha−1 in EBR. There was higher AGC in the medium diameter class (20-40 cm), except for EBR where there was higher AGC within individuals of 40-60 cm in diameter. Taxonomic diversity was weakly correlated with AGC while stand structure (stem density and maximum diameter) were strongly correlated. Our results suggest that maintaining the abundance distributions of remnant tree species, particularly that of large trees, is one important method to enhance AGC storage in the tropical ecosytems of southern Vietnam.
Źródło:
Dendrobiology; 2022, 88; 38-55
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The stand structure and natural regeneration of Abies alba Mill. in reserves on the northern margin of its distribution in SW Poland
Autorzy:
Szymura, T H
Powiązania:
https://bibliotekanauki.pl/articles/41400.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
stand structure
natural regeneration
Abies alba
silver fir
Wal Trzebnicki area
distribution
seedling density
stand type
Abietetum polonicum
mixed forest
population structure
safe site
Polska
Opis:
The silver fir (Abies alba Mill.) in the area of Wał Trzebnicki is at the northern limit of its distribution in western Poland. This study was performed in three nature reserves with protected silver fir populations. The stands in these reserves were mixed, with complex spatial structure and abundant tree regeneration. The proportion of fir in stands was around 16% of DBHS, the age of trees reached around 130 years. The silver fir occurs mainly in the sapling stage, whereas the number of seedlings was very low. The results of this study show the influence of forest floor vegetation as well as litter type on the emergence of fir seedlings. The seedlings density was compared with the results of other studies from different geographical areas and stands type in Poland.
Źródło:
Dendrobiology; 2007, 57; 55-62
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early height growth of Scots pine (Pinus sylvestris L.) progenies from Polish clonal seed orchards
Autorzy:
Chmura, D J
Giertych, M.
Rozkowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/41068.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Scotch pine
seed stand
Polska
Pinus sylvestris
seed orchard
growth
progeny testing
Opis:
Seed orchards are expected to produce geneticaly improved seeds while maintaining a sufficiently large genetic diversity. Field trials comparing open-pollinated Scots pine progeny from seed orchards and commercial seed stands were established at five climaticaly different sites in Poland. The paper presents first height measurements obtained on trees at age 4. Seedlots differed significantly, but there was no strong evidence of better performance of clonal seed orchards progeny over the progeny of production seed stands. There was no distinct geographical trend in the origin of the best growing seedlots, but populations from the northern part of country tend to perform better than south-eastern ones. Progeny of the local production seed stands at their native environment were not the best, except in one case. A strong site effect reflecting a fertility gradient of the planting sites was found.
Źródło:
Dendrobiology; 2003, 49
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physico-chemical groundwater conditions at Salix lapponum stands in Eastern Poland
Autorzy:
Serafin, A.
Pogorzelec, M.
Banach, B.
Szczurowska, A.
Mielniczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/41553.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
physicochemical condition
ground water
Salix lapponum
stand
ecological succession
Eastern Poland
Polska
Opis:
A subarctic-boreal relict species, Salix lapponum, found within the area of the Łęczna-Włodawa Lakeland (Eastern Poland), is particularly threatened with extinction due to the southern limit of its range and the specific conditions of its occurrence. This conclusion is evidenced by a systematic reduction in the number of its locations, which is accompanied by a decrease in the numbers of individuals making up its populations. The aim of the present study was to determine habitat conditions of the occurrence of Salix lapponum populations on the basis of an analysis of physico-chemical factors of groundwater at the sites associated with various stages of succession taking place in small peatland water bodies. The results of this study confirm the trend that the stands and population numbers of this species are decreasing with the intensification of ecological succession and the degree of its progress and at the same time show that this species exhibits a wide amplitude of many of the investigated factors. Among the groundwater parameters under investigation, the low level of total nitrogen, phosphorus fraction and DOC as well as the high level of Ca, pH and electrolytic conductivity can be considered to be a set of conditions that promote the maintenance of Salix lapponum populations. On the other hand, in the case of nitrates, nitrites, sulphates as well as the Na, K and Mg ions, the Kruskal-Wallis statistical test showed that the distribution of their values was invariant in relation to the studied habitats, which is probably evidence that they do not determine the development or extinction of the investigated populations in these habitats.
Źródło:
Dendrobiology; 2015, 73
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of environmental factors and management on dynamics of mixed calcareous forests under climate change in Central European lowlands
Autorzy:
Vancura, K.
Simkova, M.
Vacek, Z.
Vacek, S.
Gallo, J.
Simunek, V.
Podrazsky, V.
Stefancik, I.
Hajek, V.
Prokupkova, A.
Kralicek, I.
Powiązania:
https://bibliotekanauki.pl/articles/2130171.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
hornbeam-oak groves
beech forests
stand structure
diversity
radial growth
Czech Republic
Opis:
Mixed lowland forests reserved for natural succession are sparse in the Czech Republic. However, their development provides essential insights into the natural processes of these forests and recommendations for forest management in a changing climate. The research describes the dynamics, productivity, structure, diversity, dead wood, and radial growth of hornbeam-oak groves and calcareous beech-dominated forests in the Karlštejn National Nature Reserve (Czechia) based on inventory in 2002, 2008, 2014 and 2020. The objective was to evaluate changes in differently managed stands (high forest, coppice with standards, and coppice) after leaving the stands to spontaneous development in 2004. The tree density increased by 2–10% from 2002 to 2014 and decreased by 6–18% in 2020. In the high forest, an increase in the stand volume was observed during the whole period, while in the coppice with standards and coppice, only until 2014. The stand volume ranged from 190 (coppice) to 630 (high forest) m³ ha−1 in 2020 and increased by an average of 28% over 18 years. Overall diversity of tree layer showed an uneven structure in the high forest and a substantially diverse structure in the other variants. The deadwood volume has been steadily increasing (18–35 m³ ha−1 in 2020), accumulating an average of 1 m³ ha−1 yr−1. A lack of precipitation and high temperatures from June to August were the main limiting factors of the radial growth of tree species, while the number of negative pointer years has increased in the last decade. European beech (Fagus sylvatica L.) was the most sensitive tree species to climate compared to the resilient European ash (Fraxinus excelsior L.). The lowest fluctuations in the diameter increment were recorded in Norway maple (Acer platanoides L.) and the highest in beech in the temperature cycles of 7–15 years. Over the last 20 years, sessile oak [Quercus petraea (Matt.) Liebl.] showed an increase in radial growth by 7%, while other tree species reported a decrease with a maximum in beech (by −38%). The forest stands managed as high forest, characterized by a higher production potential and lower diversity, had slower dynamics when compared to coppice with standards and coppice.
Źródło:
Dendrobiology; 2022, 87; 79-100
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sycamore maple (Acer pseudoplatanus L.) stands on former agricultural land in the Sudetes – evaluation of ecological value and production potential
Autorzy:
Vacek, Stanislav
Vacek, Zdeněk
Kalousková, Ivana
Cukor, Jan
Bílek, Lukáš
Moser, W. Keith
Bulušek, Daniel
Podrázský, Vilém
Řeháček, David
Powiązania:
https://bibliotekanauki.pl/articles/956977.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
stand structure
growth dynamics
production
climate
tree-ring analysis
game damage
central europe
Opis:
Sycamore maple (Acer pseudoplatanus L.) is a fast-growing tree species that produces economically attractive timber, provides ecological services and has high site adaptability, but it is only a minor component of European forests. This paper describes production, structure and diversity of sycamore-dominated forest stands that originated by succession on former agricultural lands in the Orlické hory Mts., the Czech Republic. The partial objectives were to determine impact of climatic factors on the radial growth of sycamore maple and evaluate the effect of game on natural regeneration. The number of sycamore seeds on the ground was on average 9–34 seeds m–2 and seedling mortality reached on average 89% caused by damage of hare and drought. Density of natural regeneration ranged from 1,532 to 4,244 recruits ha–1, but growth dynamic was strongly influenced by ungulate browsing (69%) with the largest losses in sycamore (96%). Analyses of climatic effects showed a significantly close relationship with growth of sycamore in submontane areas, being especially sensitive to extremely dry and cold winters or very high summer temperatures. Radial growth was more significantly influenced by monthly temperatures compared to precipitation, but increasing sum of annual precipitation was main positive driver factor of diameter increment. Radial growth had the strongest relationship with weather conditions in July and October of previous year and March of the current year. Stand volume ranged from 378 to 545 m3 ha–1 at age around 75 years, while sycamore accounted for 32–82%. The horizontal structure of the tree layer was mostly random to aggregated; resembling the clumped spatial pattern of natural regeneration. Besides their wood production, these stands fulfil many ecosystem functions that are associated with high ecological stability, high structural differentiation and medium to high species diversity.
Źródło:
Dendrobiology; 2018, 79; 61-76
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Litterfall production and leaf area index in a virgin European beech (Fagus sylvatica L.) – Silver fir (Abies alba Mill.) forest
Autorzy:
Petritan, I.C.
Mihăilă, V.V.
Bragă, C.I.
Boura, M.
Vasile, D.
Petritan, A.M.
Powiązania:
https://bibliotekanauki.pl/articles/2077651.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
litterfall traps
hemispherical photos
foliar dry mass
vertical stand diversity
Southern Car-
pathians
Opis:
Because of their role in carbon and nutrient exchange, litterfall and leaf area have been increas- ingly studied in the last few decades. However, most existing information comes from managed forests, while comparable data for virgin forests is scarce. To address this scarcity, we investigated a mixed beech – silver fir virgin forest located in the Southern Carpathian Mountains, using 78 litter traps to measure the annual litterfall production, litter composition and leaf area index (LAI). The LAI was calculated in two ways: directly, by using litter traps, and indirectly, based on hemispherical photographs. Furthermore, we investigated the influence of different stand and environmental characteristics on litter production, total foliar mass and LAIs. Annual litter productivity ranged from 1.8 to 8.3 t ha−1 with a mean of 3.5 t ha−1. Litter was composed mainly of beech leaves (66%) along with a lower percentage of silver fir needles (16%). The total foliar dry mass (sum of beech leaves and silver fir needles) increased significantly with the proportion of beeches and decreased with the median stand age. The LAI determined by using litter traps had a mean value of 5.06 m2 m−2, ranging from 3.52 to 8.22, and was characterised by a higher variability than the LAI estimated indirectly using the hemispherical approach (which had a mean value of 3.65 and a range of 2.30–5.28). The two indices did not correlate with each other. We found no significant relation between the LAIs and any stand or environmental variables. We conclude that in the more complex forests, such as the virgin beech – silver fir mixed forest we studied, annual foliar dry mass is more closely related to stand characteristics than is LAI. We also note significant limitations of both LAI estimation methods, which indicate that a more elaborate approach to estimating LAI is needed.
Źródło:
Dendrobiology; 2020, 83; 75-84
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tree architecture description using a single-image photogrammetric method
Autorzy:
Gazda, Anna
Kędra, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/956834.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
stand structure
biometry
non-destructive method
plant morphology
above-ground biomass
fagus sylvatica l
Opis:
Tree architecture is thought to allow species to share available resources both above and below ground. The description of plant architecture is useful to model plant structure and function, as well as interactions with other species or generally with the environment. The aim of this study was to present a conceptual implementation of a simple photogrammetric method for the above-ground tree architecture description of leafless individuals growing under different conditions. The implemented method was single- image photogrammetry. The novel aspect is the heuristic assumption that tree’s image is a projection onto a plane that cross-sections the stem base; which enables assessment of a set of the canopy attributes, with only one image involved. The method was tested in two ways: (1) in the field: in terms of its applicability to real trees, we used 31 plots with different terrain slope and tree density, in natural forest, in every case the target tree was European beech (Fagus sylvatica L.) which is known as a very plastic tree species, and (2) with virtual tree-like 3D models, created with L-system rules, to determine the accuracy of the method. Some of the traits measured or estimated with respect to the projection plane α are: the length of the trunk and branches (L), inclination of the tree main axis from the vertical (IA), crown width (CW), two opposite crown radius (CR), crown length (CL); and the external factors, like the terrain slope inclination (S) and number of trees competing for light (N). The advantages (e.g., low time consumption and low cost), difficulties (e.g., occlusion of tree tops) and accuracy in idealised conditions were described. The tree traits that can be measured using the proposed method are essential for estimating many ecological parameters. Our method allows reducing fieldwork time to a minimum and taking measurements of large numbers of plots daily when the environmental conditions are similar, even when they are taken by only one person. This method is very useful for conducting studies on a temporal scale (e.g., to record changes in the branching structure). Future research is needed to validate the method in different environments.
Źródło:
Dendrobiology; 2017, 78; 124-135
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 42

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