Can soil respiration estimate neglect the contribution of abiotic exchange?  

作　　者：Xi CHEN WenFeng WANG GePing LUO Hui YE 

机构地区：[1]State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Journal of Arid Land》2014年第2期129-135,共7页干旱区科学（英文版）

基　　金：National Basic Research Program of China (2009CB825105)

摘　　要：This study examines the hypothesis that soil respiration can always be interpreted purely in terms of biotic processes, neglecting the contribution of abiotic exchange to COg fluxes in alkaline soils of arid areas that characterize 5% of the Earth＇s total land surface. Analyses on flux data collected from previous studies suggested reconciling soil respiration as organic （root/microbial respiration） and inorganic （abiotic CO2 exchange） respiration, whose contributions in the total CO2 flux were determined by soil alkaline content. On the basis of utilizing mete- orological and soil data collected from the Xinjiang and Central Asia Scientific Data Sharing Platform, an incorpo- rated model indicated that inorganic respiration represents almost half of the total CO2 flux. Neglecting the abiotic module may result in overestimates of soil respiration in arid alkaline lands, which partly explains the long-sought ＂missing carbon sink＂.This study examines the hypothesis that soil respiration can always be interpreted purely in terms of biotic processes, neglecting the contribution of abiotic exchange to COg fluxes in alkaline soils of arid areas that characterize 5% of the Earth＇s total land surface. Analyses on flux data collected from previous studies suggested reconciling soil respiration as organic （root/microbial respiration） and inorganic （abiotic CO2 exchange） respiration, whose contributions in the total CO2 flux were determined by soil alkaline content. On the basis of utilizing mete- orological and soil data collected from the Xinjiang and Central Asia Scientific Data Sharing Platform, an incorpo- rated model indicated that inorganic respiration represents almost half of the total CO2 flux. Neglecting the abiotic module may result in overestimates of soil respiration in arid alkaline lands, which partly explains the long-sought ＂missing carbon sink＂.

关 键 词：soil respiration abiotic exchange hypothetical system incorporated model missing carbon sink 

分 类 号：S154[农业科学—土壤学]