Abstract

Abstract: The latest researches on the effects of elevated atmospheric CO₂ on the exchanges of trace gases (e.g., CO₂, CH₄ and N₂O) between the atmosphere and ecosystems were reviewed. The techniques and methods involved in the researches were introduced firstly. Then the review mainly focused upon the results from those studies using the open-top-chamber (OTC) methods and the free-air carbon dioxide enrichment (FACE) system. Generally, elevated atmospheric CO₂ may stimulate biomass accumulation, and enlarge C/Nratio in plant tissue so as to reduce the decomposition of organic matter. This action could increase CO₂ sequestration in terrestrial ecosystems. Elevated atmospheric CO₂ could impact on methanogenic bacteria and CH₄ emissions. An increase in CH₄ emissions from wetland may appear. The argument among the responses of N₂Oemissions to elevated CO₂, however, was inconsistent. So far, no study on other trace gases was reported. More efforts should be taken in the research on the effects of elevated atmospheric CO₂ on the exchange of trace gases.

CLC Number:

S161

XU Zhongjun, ZHENG Xunhua, WANG Yuesi . [J]. Chinese Journal of Applied Ecology, 2002, (10): 1344-1348.

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