Precipitation Pulses and Soil CO_2 Emission in Desert Shrubland of Artemisia ordosica on the Ordos Plateau of Inner Mongolia,China

作     者：JIN Zhao DONG Yun-She QI Yu-Chun M. DOMROES JIN Zhao 1,2 , DONG Yun-She 1,2 , QI Yu-Chun 1 and M. DOMROES 3 1 Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101 (China) 2 State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075 (China) 3 Institute of Geography, Mainz University, Mainz 55099 (Germany)

作者机构：Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 （China） State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi＇an 710075 （China） Institute of Geography Mainz University Mainz 55099 （Germany） 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2009年第19卷第6期

页      面：799-807页

核心收录：

学科分类：07[理学] 0818[工学-地质资源与地质工程] 09[农学] 070602[理学-大气物理学与大气环境] 0903[农学-农业资源与环境] 0706[理学-大气科学] 0901[农学-作物学] 090301[农学-土壤学] 

基　　金：Project supported by the National Natural Science Foundation of China (Nos. 40730105, 40501072 and 40673067) the National Key Basic Research Program (973 Program) of China (No. 2002CB412503) the Knowledge Innovation Program of the Chinese Academy of Sciences (No. KZCX2-YW-149) 

主　　题：desert shrub ecosystem Mu Us sand land soil respiration response water addition 

摘      要：Precipitation is the major driver of ecosystem functions and processes in semiarid and arid regions. In such waterlimited ecosystems, pulsed water inputs directly control the belowground processes through a series of soil drying and rewetting cycles. To investigate the effects of sporadic addition of water on soil CO2 effux, an artificial precipitation event （3 mm） was applied to a desert shrub ecosystem in the Mu Us Sand Land of the Ordos Plateau in China. Soil respiration rate increased 2.8 4.1 times immediately after adding water in the field, and then it returned to background level within 48 h. During the experiment, soil CO2 production was between 2 047.0 and 7 383.0 mg m^-2. In the shrubland, soil respiration responses showed spatial variations, having stronger pulse effects beneath the shrubs than in the interplant spaces. The spatial variation of the soil respiration responses was closely related with the heterogeneity of soil substrate availability. Apart from precipitation, soil organic carbon and total nitrogen pool were also identified as determinants of soil CO2 loss in desert ecosystems.