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《Acta Agrestia Sinica》 2011-04
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Grassland Community Structure and Interspecies Relationships in Nalati Pasture

WANG Wei,ZHANG Xian-hua,AN Sha-zhou(College of Grassland and Environment Science,Xinjiang Agricultural University;Key Laboratory of Grassland Resources and Ecology of Xinjiang,Urumqi 830052)  
This study reports natural grasslands under enclosure condition during growing season for four years(plot 1)and grazing condition(plot 2)for restoration processes and reasonable utilization of deteriorated grasslands in Nalati pasture.Grassland community structure and interspecies relationships are studied using Dahl diversity indexes and Shannon-Weaver diversity indexes,evenness index,Sorensen similarity index,Fisher's exact test of 2×2 contingency table,Pearson correlation,Spearman rank correlation.Results indicate that species diversity indices and evenness index of plot 1 are all smaller than that of plot 2.Species of both plots had significant positive correlations.The analysis results by Spearman rank correlation are more accurate than that by 2×2 contingency table and Pearson correlation.Spearman rank correlation shows that 7.69 percent of the total species have significant positive correlations in enclosure plot and 8.02 percent of the total species have significant positive correlations in grazing plot.There are different habitats between enclosed plot during growing season for hay production and the grazing plot.The same species do not display the same significant correlation in both plots due to different utilizations.
【Fund】: 新疆科技厅科技攻关项目"新疆草原主要毒害草防治技术开发及试验示范"(200831104)资助
【CateGory Index】: S812
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