The emission-flux and mitigation options for N2O and CH4 from wheat fields under different rotation systems in Central China

文献类型： 外文期刊

第一作者： Guo, LP

作者： Guo, LP;Lin, ED;Li, ZP;Wang, YQ

作者机构： Chinese Acad Agr Sci, Agrometeorol Inst, Beijing 100081, Peoples R China

关键词： methane emission flux;nitrous oxide emission flux;rotation system;mitigation options

期刊名称：NON-CO2 GREENHOUSE GASES: SCIENTIFIC UNDERSTANDING, CONTROL AND IMPLEMENTATION

ISSN：

年卷期： 2000 年

页码：

收录情况： SCI

摘要： The seasonal variation of nitrous oxide and methane fluxes and their relationships with soil inorganic nitrogen, dissolved organic carbon, and soil respiration were studied from typical dryland fields (winter wheat-cotton rotation and single winter wheat). The results showed that: i) The N2O flux from wheat-cotton and single wheat fields were 78.3 and 22.4 mu g N2O-N/m(2)/h respectively through reviving to maturing stage under the wheat season. The N2O flux from soils was positively correlated with soil inorganic N under warmer temperature.; ii) The soil respiration may reflect the status of crop plants and roots' growth and uptaking nutrients; iii) Soil dissolved organic carbon (DOC) could not exactly reflect the soil respiration intensity; iv) The daily variation of N2O flux and soil respiration was constant with daily temperature variation; v) The typical cropland was a weak net CH4 sink with the average flux of -0.008 similar to - 0.026 mu g CH4/m(2)/h (ranged from -0.107 to 0.03 mu g CH4/m(2)/h). And the dairy variation of CH4 flux was not regular with daily temperature variation. The mitigation options for N2O should be adopted mainly after N dressing was occurred especially under warmer temperature.

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