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Relationship of soil surface CO_2 flux with microbial biomass carbon in the karst areas of Southwest china

chinese Science Bulletin 1999年第S2期44卷 122-123页

作者： piao hechun, hong yetang and yuan zhiyun state key laboratory of environmental geochemistry, institute of geochemistry, chinese academy of sciences, guiyang 550002, china state key laboratory of environmental geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

THE production of C02 in the soil results from the oxidation of soil organic matter by heterotrophic microorganisms and by the respiration of plant roots. The release of C02 from the soil is a major flux in theglobal carbon cycle, which is largely fuelled by plant production. In this note, we investigated the release of C02from soils of the karst region. We measured the amount of soil microbial biomass carbon,soluble organic carbon in the soil, and the flux of C02 from the soil surface over a 1-year period. Thisnote is to examine the factors affecting the flux of C02 from the soil surface in an ecosystem with nutrientpoor soils and limited amounts of soil microbial biomass. This study was conducted from June 1997 through May 1998 on a hill side, located in the suburbs ofguiyang City in Guizhou Province of china （latitude 26°30’N, longitude 106°39’E）. Situated 1

关键词： soil carbon dioxide karst areas.

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Changes or soil microbial biomass carbon and orgamc carbon with sea level elevation increasing in soils of mountainous areas, Southwest china

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chinese Science Bulletin 1999年第S2期44卷 116-117页

作者： piao hechun, hong yetang and yuan zhiyun state key laboratory of environmental geochemistry, institute of geochemistry, chinese academy of sciences, guiyang 550002, china

SOIL organic matter, a major factor affecting agroecosystem stability, is controlled by many parameters. Itis well understood that cultivation practive would lead to a decrease in organic matter content of ***, small gradual changes in total soil organic matter may be difficult to monitor and detect in theshort term because of generally high background carbon levels and natural variability of soils. On ashort-term scale the measurement of the living fraction of soil organic matter, i.e. microbial biomass C,can reveal early changes in soil organic matter. Our work is to identify the relationship of soil organic Cand changes in microbial biomass C with sea-level elevation increasing. Twelve terrace fields on the slopes at different altitudes above sea level were chosen as sample localities. The terrace fields, different in size, approximately 10 m^2, were used for growing maize. Those sam-

关键词： soil microbial biomass carbon organic carbon soils.

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