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《Journal of Anhui Agricultural Sciences》 2009-02
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Comparative Studies on Soil and Herbage Community in Clear-cutting Forestlands and Kobresia setchwanensis Meadow in Northwestern Regions of Sichuan Province

ZHOU Wei-sheng et al(College of Life Sciences,Sichuan University,Chengdu,Sichuan 610064)  
Through plots investigation,sampling above-ground and underground biomass,analysis of soil physical and chemical characteristics,this study aimed to conduct comparative studies on soil and herbage community in clear-cutting forestland and Kobresias setchwanensis meadow in northwestern regions of Sichuan Province.The results showed that ① The content of organic matter,porosity degree,total N,total P,total K and NH-N in clear-cutting forestland soil were higher,but the content of NO-3-N and bulk density were lower.The physical and chemical characteristics of soil in K.setchwanensis meadow was worse than that of K.setchwanensis meadow soil,whose natural restoration needed a long time;② Gramineous plants in clear-cutting forestland were dominant species,whose primary plants were gramineae and forbs.Sedge plants in K.setchwaneusis meadow were dominant species,whose primary plants were sedge and forbs.Herbage community height,specie numbers,Margalef index and Shannon-Wiener diversity index in clear-cutting forestland were bigger,individual density and specie uniformity degree in clear-cutting forestland were smaller and the herbaceous community in clear-cutting forestland was not a steady community.Community biomass in clear-cutting forestland and K.setchwaneusis meadow were not different,and K.setchwanensis meadow was able to recover as a fine meadow with gramineous plants as dominant species after lower grazing or stop grazing;③ Plant species and community appearance in the dominant synusia of herbage community in clear-cutting forestland and K.setchwanensis meadow were different.
【Fund】: 国家重点基础研究发展规划(2005CB422006);; 中国科学院知识创新工程项目(KZCX3-SW-339)
【CateGory Index】: S812
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