The characteristics of greenhouse flux of soil in Karst rocky desertification regions
LIU Fang1,2, LIU Cong-qiang1, WANG Shi-lu1, LAN Cui-ling2
1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; 2. Department of Chemistry and Life Science, Baise University, Baise 533000, China
CO2,N2O and CH4 fluxes from Karst rocky desertification areas in central Guizhou were measured monthly by using static chamber-GC method from June 2006 to May 2007 to investigate the characteristics of seasonal change of greenhouse gas fluxes from soil in Karst region in South China.The results indicate that the soils are the sources of CO2 and N2O,but the sink of CH4.CO2 fluxes change from 450.8±50.8 to 1281.3±214.7 mg·m2·h-1,with higher fluxes in summer and autumn,but lower fluxes in spring and winter.N2O fluxes vary from-25.4±4.1 to 105.8±31.2μg·m-2·h-1,with the highest fluxes in summer.The soils absorb N2O in the air in September,November and December.CH4 fluxes show no significant changes with the seasons,and they vary from-0.27±0.18 to 0.81±0.26 mg·m-2·h-1.The climate conditions have no obvious effects on the fluxes of CO2 and CH4.The effects of soil water on N2O fluxes vary with seasons.The correlation analysis shows that there is significant correlation between soil nitrate content and N2O/CH4 fluxes,suggesting nitrate content in soil is the primary driven factor affecting the seasonal change of N2O and CH4 fluxes.
刘芳1,2, 刘丛强1*, 王仕禄1, 兰翠玲2. 喀斯特石漠化地区土壤温室气体的地气交换特征[J]. , 2009, 28(4): 289-292.
LIU Fang1,2, LIU Cong-qiang1, WANG Shi-lu1, LAN Cui-ling2. The characteristics of greenhouse flux of soil in Karst rocky desertification regions. , 2009, 28(4): 289-292.
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