Carbon stocks and environmental controls of Chinas grasslands
Ecosystem carbon stocks in the northern grasslands play an important role in the global carbon cycles ; however, little information on those is available for Chinas temperate and alpine grasslands.During the last five years from 2001 to 2005, we conducted large‐scale field campaigns to investigate biomass carbon stocks and soil organic carbon ( SOC) storage for these grasslands.We have collected 978 soil profiles and 1700 biomass plots from 326 sites across the regions (including Qinghai, Tibet, Inner Mongolia, and Xinjiang).Over the whole area with 185 × 104 km2, the biomass carbon stock was estimated at 536.1 Tg C (1 Tg ＝ 1012g) with a mean biomass density of 41.8 g Cm‐2 for aboveground and 246.0 g C m-2 for belowground, and SOC storage in the top 1 meter was estimated at 14.9 Pg C (1 Pg ＝1015g), with an average density of 8.0 kg C m‐2.Generalized linear model analysis showed that region, climatic variables and soil texture together explained 50％ of total variance in biomass and about 70％ of that in SOC density.Of the variables examined, water availability explained the largest proportion ( ～ 25％ and 60％ ) of the biomass and SOC variation.Our results suggest an important control of water availability on plant production and soil carbon storage in Chinas grasslands.
aboveground biomass alpine grasslands belowground biomass soil organic carbon temperate grasslands .
Jingyun Fang Yuanhe Yang Wenhong Ma Anwar Mohammat
Department of Ecology,and Key Laboratory for Earth Surface Processes of the Ministry of Education,Peking University,Beijing 100871,China
国际会议
呼和浩特
英文
2008-06-29（万方平台首次上网日期，不代表论文的发表时间）