Spatial Variation of Plant Diversity of Leymus chinensis Patch Following Environment Fragmentation in Songnen Plain
Spatial Variation of Plant Diversity of Leymus chinensis Patch Following Environment Fragmentation in Songnen Plain
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发表时间：
2008
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通讯作者：
Li Jian-dong
中科院分区：
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作者：
Li Jian-dong
The statistical and quantitative analysis of botanical composition,quantitative characteristics,life form,dominance and diversity were carried out on different sized patches in the fragmental Leymus chinensis(Trin.) Tzvel.grassland of Songnen Plain.The results are as follows: The number of the plant species,species richness(Margalef index),species diversity (Shannon-Weiner index),and evenness(Pielou index) varied univocally along with the patch scale from big to small,which supported the Intermediate Disturbance Hypothesis;For the functional group composition in sense of life form,along with the patches from big to small,the percentage of chamaephyte and hemicryptophytes decreased gradually with the biggest value of 40.0% and 6.7% appeared on big patches,the hemicrypto-geophyte and geophyte increased little by little with the medium and small patches had the biggest value at 25.0% simultaneously,while the changing trend of therophyte was decreased at first and then increased with the big patch owning the biggest value at 13.3%.The irregular changes of dominance ratio of a given species and the regular changes of the functional groups revealed that the ecological compensation not only operated among functional groups in a community but also among individual species within a functional group.
