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Influence of grazing on diversity of Dodonaea viscosa Heteropogonetea contortus herb-shrub community

LI Kun1,2,LI Qiao3,CHEN You-qing2,ZHOU Xing-yin3,CHEN Yan-lin3,ZHAO Pei-xian4(1.College of Biological Sciences and Biotechnology,Beijing Forestry University,Beijing 100083,China;2.Research Institute of Resources Insects,Chinese Academy of Forestry,Kunming 650224,Yunnan,China;3.Faculty of Conservation Biology,Southwest Forestry College,Kunming 650224,Yunnan,China; 4.Forest Enterprise of Yuanmou County,Yuanmou 651300,Yunnan,China)  
Influence of grazing on biodiversity of Dodonaea viscosa-Heteropogonetea contortus scrub and grass clump in Yuanmou Arid-hot Valley was studied with sample plot investigation and biodiversity analysis.The results showed that the most abundant vegetation species and arthropod species were in the non-disturbed scrub and grass clump.Formica fusca was the dominant species in its arthropod community.And the highest diversity index and the evenness index were found,as well the lowest predominant index.The poorest vegetation species and arthropod species were in the overgrazed scrub and grass clump.The lowest diversity index was found in its arthropod community in the shrub-grass layer.More abundant vegetation species and arthropod species were in the scrub and grass clump with certain long-term grazing.The lowest evenness index and highest predominant index were found in its arthropod community.The piercing-sucking insects were predominant in the shrub-grass layer,and Monomorium mayri was predominant in the litter-layer in the grazed clumps.The species component changed in the overgrazed clump,biodiversity in the ecosystem depressed greatly,the arthropod community was instable,and the habitat degraded.Grazing had more effect on the biodiversity of the litter-layer arthropod communities than that of in the shrub-grass layer.
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