CO flux of soil respiration in natural recovering karst abandoned farmland in Southwest China

作者：Yanwei Wang,Weijun Luo,Guangneng Zeng,Hanling Yang,Meifang Wang,Yina Lyu,Anyun Cheng,Lin Zhang,Xianli Cai,Jia Chen,Shijie Wang

摘要：To estimate carbon sequestration potential in the karst area,soil respiration in a natural recovering karst abandoned farmland in Shawan,Puding,Guizhou,southwest China was continuously and automatically monitored for more than two years.The results show that the CO2flux of soil respiration(2.63±1.89 lmol m^-2s-^1)is higher in the karst area than in non-karst areas under similar conditions but that regional value(1.32 lmol m-2s-1)is lower because of larger rock fragment coverage(~50%).A the same time,the temperature sensitivity of soil respiration(Q10)in this study area is significantly higher than that of non-karst areas under similar conditions.Soil respiration has an obvious temporal variation,which is reflected in a significant exponential relationship between soil respiration and soil temperature,but the relationship between soil respiration and soil moisture is very complex.Especially soil respiration has an obvious spatial variation,which is likely affected by different diffusion or water-rock reaction processes.

發文機構：State Key Laboratory of Environmental Geochemistry University of Chinese Academy of Sciences Puding Karst Ecosystem Research Station School of Chemistry and Eco-Environniental Engineering School of Geography and Environmental Sciences

關鍵詞：KarstcriticalzoneAbandonedlandSoilrespirationCarboncycle

分類號： S15[農業科學—土壤學]