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《Chinese Journal of Ecology》 2010-07
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Effects of freezing-thawing cycle on soil respiration under different land-use patterns in Keerqin Sandy Lands

WANG Qiong1,2,FAN Zhi-ping2,WANG Man-gui3,ZHANG Xin-hou2,SUN Xue-kai2,ZENG De-hui2 (1School of Environmental Science,Liaoning University,Shenyang 110036,China;2Daqinggou Ecological Station,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;3Tongliao Forest Resources Management Station,Tongliao 028000,Inner Mongolia,China)  
Soil freezing-thawing cycle is common in mid-high latitude and high altitude regions,which may affect soil physicochemical and/or biological properties,and further,soil respiration process.To study the variations of soil respiration rate under freezing-thawing cycle is of significance in accurately estimating global carbon budget.Taking the sandy grassland (SG),Mongolian pine savanna (MPS),and farmland (FD) in Keerqin Sandy Lands as test objects,a laboratory experiment was conducted to study their soil respiration rates under freezing-thawing.Land use pattern had significant effects on the soil respiration rate.In the control (no freezing-thawing),the respiration rate was higher in SG than in MPS and FD (P0.05),with the value being 0.339,0.258,and 0.234 μmol CO2·m-2·s-1,respectively;while under freezing-thawing,the soil respiration rate was significantly higher in SG and MPS than that in FD (P0.05).The mean soil respiration rate in SG,MPS,and FD under one freezing-thawing cycle was 0.276,0.243,and 0.233 μmol CO2·m-2·s-1,and that under multi-freezing-thawing cycles was 0.314,0.274,and 0.259 μmol CO2·m-2·s-1 respectively.The Q10 value in SG,MPS,and FD was 116.0,26.2,and 16.4,respectively,suggesting the strong effects of land use pattern on the temperature dependence of soil respiration at low temperature in winter.
【Fund】: 国家自然科学基金项目(30972418);; “十一五”国家科技支撑计划项目(2006BAC01A12、2006BAD03A0203);; 辽宁省自然科学基金项目(20092080);; 沈阳市科学技术计划资助项目(1091155-9-00)
【CateGory Index】: S154.1
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