| β-diversity Patterns of Plant Community in Fragmented Habitat in a Degenerated Meadow in Songnen Plain, China |
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| 作者单位： | Key Laboratory for Vegetation Ecology of Ministry of Education,Institute of Grassland Science,Northeast Normal University,Changchun 130024,China |
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| 基金项目： | Under the auspices of Major State Basic Research Development Program of China(973 Program)，National Key Technology R & D Program of China，National Natural Science Foundation of China |
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| 摘 要： |
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| 关 键 词： | 植物群落多样性 类群多样性 松嫩平原 生境破碎 退化草地 分散 中国 相似性指数 |
| 收稿时间： | 28 December 2007 |
β-diversity patterns of plant community in fragmented habitat in a degenerated meadow in Songnen Plain, China |
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| Authors: | Dayong Han Haiyan Li Yunfei Yang |
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| Institution: | Key Laboratory for Vegetation Ecology of Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun 130024, China |
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| Abstract: | A number of isolated islands of Leymus chinensis + herbosa community were investigated in fragmented habitat islands, by Braun-Blanquet field survey approach, in a degenerated
meadow in the Songnen Plain, China in 2007. These islands were classified as large, medium, and small scales on the basis
of the island area (100–1000m2, large island; 50–100m2, middle island; 10–50m2, small island). Each scale of the investigation involved eight islands. The responses of β-diversity patterns of plant taxon to the habitat fragmentation at local community and metacommunity levels were analyzed
on different scales of 24 isolated islands. The results indicated that at the local community level, there were 57 species
belonging to 20 families and 49 genera in large islands, 49 species belonging to 16 families and 40 genera in middle islands,
and 27 species belonging to eight families and 23 genera in small islands. β-diversity indexes for species, genus and family in large, middle, and small islands varied greatly, and the highest value
of the indexes was not noted in the largest island. However, the average of the data obtained at the three scales showed that
across large islands, Whittaker indexes were low and Bray-Curtis similarity indexes were high, while across small islands,
Whittaker indexes were high and Bray-Curtis similarity indexes were low. At the metacommunity level, Whittaker indexes for
species and genus showed a great significantly negative double logarithmic correlation (p<0.01) with the island area, whereas the Bray-Curtis indexes for species, genus and family showed a great significantly positive
double logarithmic correlation (p<0.01) with the island area. At both local community and metacommunity levels, turnovers of species and genus could respond
more sensitively to spatial changes of plant diversity patterns than that of family. Hence, the species and the genus could
be used for the analysis of β-diversity patterns of plant community. |
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| Keywords: | habitat fragmentation local community metacommunity plant taxon |
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