The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
C.b.s. Dutt - One of the best experts on this subject based on the ideXlab platform.
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Diagnostic analysis of conservation zones using remote sensing and GIS techniques in wet evergreen forests of the Western Ghats – An ecological hotspot, Tamil Nadu, India
Biodiversity & Conservation, 2003Co-Authors: G. Amarnath, M.s.r. Murthy, S.j. Britto, G. Rajashekar, C.b.s. DuttAbstract:This study highlights spatial characterization of evergreen forests of the Western Ghats – an ecological hotspot in Tamil Nadu, India – using remote sensing and GIS-based analysis in conjunction with ground-based phytosociological data. The evergreen forests of Tamil Nadu are distributed in four distinct hill ranges, Nilgiri, Anamalai, Palni and Tirunelveli, having different topographic, bioclimatic and disturbance levels. The evergreen forests in these four hill ranges are characterized for their uniqueness in terms of patch characteristics and Phytosociology. A vegetation type map was prepared using IRS LISS III satellite data and was used to study the patch characteristics in terms of patch size, number, shape, porosity and landcover diversity (LD). The phytosociological characteristics, namely species richness, diversity, similarity and community assemblages, were studied using ground data collected from 95 sample points of 0.1 ha size. Patch size and number revealed distinct intactness and disturbance levels in these four hill ranges. Evergreen forests in the Tirunelveli hills comprising 216.09 km^2 are distributed in 306 patches, and in the Palni hills, with 285 km^2, forests are distributed in 1029 patches, indicating a high level of fragmentation. LD, indicating the spatial heterogeneity of landcover, was very high in the Nilgiri hills and low in the Tirunelveli hills. The spatial analysis helped to delineate homogenous large patches of evergreen forest, which can be adopted for appropriate conservation strategies. A total of 342 tree species belonging to 4490 stems were evaluated for Phytosociology. Only 15–28% of similarity in terms of species distribution was found across the hill ranges. Conjunctive analysis of patch characteristics and species distribution showed high species richness in less fragmented evergreen forests and vice versa . The study identified the areas of prioritization in terms of ecorestoration and conservation based on patch and phytosociological characteristics.
Woldu Zerihun - One of the best experts on this subject based on the ideXlab platform.
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measuring the effects of human impact on vegetation by integrating Phytosociology and remote sensing in a fuzzy set approach
Journal of Vegetation Science, 2003Co-Authors: Enrico Feoli, Paola Ganis, Irene Ortolan, Daniel Sitoni, Woldu ZerihunAbstract:Abstract The response of fragmented vegetation to human impact has been analysed in degraded and degrading areas in Tanzania (Lake Manyara). Phytosociology was integrated with GIS and remote sensing data as follows: (1) a land cover/land use map was obtained by analysing remote sensing data and conducting field verification; (2) phytosociological releves were randomly sampled in woodland vegetation patches using the map; (3) the pattern of land cover/land use around the releves was described; (4) gradients of land use intensity (human impact) were obtained based on the descriptions; (5) the response of vegetation types to impacts of gradients was calculated using fuzzy set theory. Two complementary gradients of human impact were defined based on land cover/land use analysis of the remotely sensed data: one related to cultivation intensity and the other to grazing intensity. Response functions of vegetation types (defined by numerical classification) to these gradients demonstrated that the vegetation type...
Jorg Ewald - One of the best experts on this subject based on the ideXlab platform.
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a critique for Phytosociology
Journal of Vegetation Science, 2003Co-Authors: Jorg EwaldAbstract:Abstract Phytosociology is a subdiscipline of plant ecology that describes the co-occurrence of plant species in communities. Gradient analysis and classification are its complementary tools. Various peculiarities and anachronisms of Central European Phytosociology conceal its similarity with Anglo-American approaches. Phytosociology deserves to be updated as a part of modern vegetation science that can build on a vast heritage of high-quality data and the tools to store and analyse them in ways that go beyond syntaxonomy. By providing a context to more specialized pure and applied research, it has a crucial role to play in understanding community structure, ecosystem functioning and biological evolution. Abbreviations: AAPE = Anglo-American plant ecology; CEPS = Central European Phytosociology; PS = Phytosociology.
Boštjan Surina - One of the best experts on this subject based on the ideXlab platform.
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Phytosociology And Ecology Of The Dinaric Fir-Beech Forests (Omphalodofagetum) At The North-Western Part Of The Illyrian Floral Province (Nw Dinaric Alps)
Hacquetia, 2013Co-Authors: Boštjan Surina, Igor DakskoblerAbstract:We studied the Phytosociology, ecology and biogeography of the Dinaric fir-beech stands (Omphalodo-Fagetum) in the Trnovski gozd plateau, at the north-western part of the Illyrian floral province. We identified and confirmed two geographical variants (var. geogr. Saxifraga cuneifolia – central and western part of the plateau, and var. geogr. Calamintha grandiflora – eastern part of the plateau), and 10 floristically and ecologically well differentiated subassociations (-rhododendretosum hirsuti,-saxifragetosum cuneifoliae, -adenostyletosum glabrae, -festucetosum altissimae, -calamagrostietosum arundinaceae, -stellarietosum montanae, -seslerietosum autumnalis, -calamagrostietosum variae, -sambucetosum nigrae and -asaretosum europei). The most frequent stands bellong to the subassociation -festucetosum altissimae and -calamagrostietosum arundinaceae, which, in terms of site ecology and floristic composition, represent the central forest types in the research area. They are floristically impoverished and lack majority of association’s characteristic species which is in line with the biogeographic peculiarites of the research area.
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snowbed vegetation in croatia Phytosociology ecology and conservation status
Plant Biosystems, 2010Co-Authors: ž Modric Surina, Boštjan SurinaAbstract:Abstract Phytosociology, ecology and chorology of snowbed vegetation in Croatia were researched. Snowbed stands, found only in freezing ravines and dolines of the Liburnian karst and Velebit Mountains (NW Dinaric Alps, NW Croatia), were classified into the association Drepanoclado-Heliospermetum (Salicion retusae, Arabidetalia caeruleae, Thlaspietea rotundifolii). Those stands, exposed mostly to the north and shaded for the majority of the growing season, were developed on more or less settled periglaciar screes and boulders in the coldest parts (bottoms, smaller ditches) of the dolines with long-lasting snow cover. Due to lower altitude of Croatian mountains, snowbed vegetation could be found only azonally, in freezing ravines surrounded by altimontane and subalpine (fir-)beech and spruce forests, where these stands manage to thrive due to specific microclimatic conditions. Snowbeds host some rare, endangered and/or protected plant species in Croatia. Vulnerability of the flora and vegetation of snowbeds...
G. Amarnath - One of the best experts on this subject based on the ideXlab platform.
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Diagnostic analysis of conservation zones using remote sensing and GIS techniques in wet evergreen forests of the Western Ghats – An ecological hotspot, Tamil Nadu, India
Biodiversity & Conservation, 2003Co-Authors: G. Amarnath, M.s.r. Murthy, S.j. Britto, G. Rajashekar, C.b.s. DuttAbstract:This study highlights spatial characterization of evergreen forests of the Western Ghats – an ecological hotspot in Tamil Nadu, India – using remote sensing and GIS-based analysis in conjunction with ground-based phytosociological data. The evergreen forests of Tamil Nadu are distributed in four distinct hill ranges, Nilgiri, Anamalai, Palni and Tirunelveli, having different topographic, bioclimatic and disturbance levels. The evergreen forests in these four hill ranges are characterized for their uniqueness in terms of patch characteristics and Phytosociology. A vegetation type map was prepared using IRS LISS III satellite data and was used to study the patch characteristics in terms of patch size, number, shape, porosity and landcover diversity (LD). The phytosociological characteristics, namely species richness, diversity, similarity and community assemblages, were studied using ground data collected from 95 sample points of 0.1 ha size. Patch size and number revealed distinct intactness and disturbance levels in these four hill ranges. Evergreen forests in the Tirunelveli hills comprising 216.09 km^2 are distributed in 306 patches, and in the Palni hills, with 285 km^2, forests are distributed in 1029 patches, indicating a high level of fragmentation. LD, indicating the spatial heterogeneity of landcover, was very high in the Nilgiri hills and low in the Tirunelveli hills. The spatial analysis helped to delineate homogenous large patches of evergreen forest, which can be adopted for appropriate conservation strategies. A total of 342 tree species belonging to 4490 stems were evaluated for Phytosociology. Only 15–28% of similarity in terms of species distribution was found across the hill ranges. Conjunctive analysis of patch characteristics and species distribution showed high species richness in less fragmented evergreen forests and vice versa . The study identified the areas of prioritization in terms of ecorestoration and conservation based on patch and phytosociological characteristics.