Advances in Earth Science ›› 2011, Vol. 26 ›› Issue (2): 235-244. doi: 10.11867/j.issn.1001-8166.2011.02.0235

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Effect of Elevated CO 2 on Ecosystem and C-N Coupling  in Arid and Semi-arid Region

Yin Feihu 1, Li Xiaolan 1, Dong Yunshe 1,2, Xie Zongming 1, Gao Zhijian 1, He Shuai 1   

  1. 1. Xinjiang Academy of Agricultural and Reclamation Science, Shihezi832000, China; 2. Institute of Geographic Science and Natural Resources Research, CAS, Beijing100101, China
  • Received:2010-04-07 Revised:2010-09-14 Online:2011-02-10 Published:2011-02-10

Yin Feihu, Li Xiaolan, Dong Yunshe, Xie Zongming, Gao Zhijian, He Shuai. Effect of Elevated CO 2 on Ecosystem and C-N Coupling  in Arid and Semi-arid Region[J]. Advances in Earth Science, 2011, 26(2): 235-244.

Atmospheric CO2 concentrations had increased from approximately 280 μmol/mol  in the late 19th-century to over 360 μmol/mol  today. Elevated CO2not only pricked up global greenhouse effect, but also changed the C balance of global ecosystems, which led to the changes of ecosystem structure and function. Alterations in microbial mineralization and nutrient cycling may control the longterm response of ecosystems to elevated CO2. Elevated CO2concentrations influenced carbon cycle, ecosystem productivity, plant, soil, microbe, and other environmental factors. The effects of elevated CO2 on growth were highly dependent on interactions with N cycling. Particularly important was the effect of elevated CO2 on N cycling and availability because shortages in N could eventually attenuate the increased plant biomass production seen in shortterm elevated CO2 studies. Changes in microbial biomass C and N, microbial activity and inorganic N could indicate the effects of elevated CO2on N dynamics. Increases in N-use efficiency tended to increase the C/N ratio of plant materials grown in elevated CO2. The purpose of this paper  is to summarize the changes of ecosystems and C-N coupling due to the increasing atmospheric CO2concentration in order to lucubrate to carbon cycle and nitrogen cycle in arid and semi-arid region.

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