Ecosystem carbon stocks and their changes in China's grasslands

作     者：Anwar MOHAMMAT 

作者机构：Department of EcologyKey Laboratory for Earth Surface Processes of the Ministry of EducationCollege of Urban and Environmental SciencesPeking University 

出 版 物：《Science China(Life Sciences)》 (中国科学（生命科学英文版）)

年 卷 期：2010年第53卷第7期

页      面：757-765页

核心收录：

学科分类：090503[农学-草业科学] 0909[农学-草学] 0905[农学-畜牧学] 09[农学] 0903[农学-农业资源与环境] 

主　　题：alpine grasslands biomass carbon sink climate change soil organic carbon soil texture temperate grasslands 

摘      要：The knowledge of carbon(C) stock and its dynamics is crucial for understanding the role of grassland ecosystems in China s terrestrial C *** date,a comprehensive assessment on C balance in China s grasslands is still *** reviewing published literature,this study aims to evaluate ecosystem C stocks(both vegetation biomass and soil organic C) and their changes in China s *** results are summarized as follows:(1) biomass C density(C stock per area) of China s grasslands differed greatly among previous studies,ranging from 215.8 to 348.1 g C m-2 with an average of 300.2 g C ***,soil C density also varied greatly between 8.5 and 15.1 kg C *** total,ecosystem C stock in China s grasslands was estimated at 29.1 Pg C.(2) Both the magnitude and direction of ecosystem C changes in China s grasslands differed greatly among previous *** to recent reports,neither biomass nor soil C stock in China s grasslands showed a significant change during the past 20 years,indicating that grassland ecosystems are C neutral.(3) Spatial patterns and temporal dynamics of grassland biomass were closely correlated with precipitation,while changes in soil C stocks exhibited close associations with soil moisture and soil *** activities,such as livestock grazing and fencing could also affect ecosystem C dynamics in China s grasslands.