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《Acta Pratacultural Science》 2002-01
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Effect of environmental factors on CO_2 release rate of soil respiration of two main communities in Lymus chinensis grassland in northeastern China

WANG Wei 1, ZHOU Xiao mei 2,GUO Ji xun 3 (1.Department of Environmental Science, Northeast Normal University, Changchun 130024, China; 2.Department of Biology, Siping Normal College, Siping 136000, China; 3.Grassland Research Institute, Northeas  
This paper analyzed seasonal dynamics of soil respiration through alkaline absorption methods in Lymus chinensis and Puccinellia tenuiflora communities. The relationship between soil respiration and environmental factors was also discussed through Grey analysis. The results were as follows: (1) The seasonal dynamics of soil respiration showed a single peak curve with the maximum 13.27 g/(m 2·d) in the middle August in Lymus chinensis community and with the maximum 11.4 g/(m 2·d) in the middle July in Puccinellia tenuiflora community; (2) Among eleven environmental factors, pH, wind velocity, soil water content, porosity and organic matter content kept a bigger Grey connection degree opposite CO 2 release rate of soil respiration and were major factors. The ration between organic carbon and nitrogen, soil temperature and precipitation kept a smaller Grey connection degree and were limited factors of soil respiration; (3) The regression models were established between CO 2 release rate of soil respiration ( y ) and soil water content at 0-10cm-depth (x): y =126.51 x -6.512 1 ( R 2 =0.92, P 0.05) in Lymus chinensis community and y=60.425x-1.702 4 in Puccinellia tenuiflora community (R 2=0.98,P 0.05).
【Fund】: 国家自然科学基金资助项目 (39970 537);; 国家“973”重点基础研究发展规划项目 (G2 0 0 0 0 1 860 8)
【CateGory Index】: S812
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