农业活动对土壤甲烷汇的影响研究

Impact of agriculture on the soil sink for methane

  • 摘要: 耕作对土壤CH4吸收有长期抑制作用并极大地降低了土壤CH4汇的强度。施NH4+-N 肥可抑制土壤CH4 氧化,而N03--N 肥则无此作用,NH4+-N肥对土壤CH4 氧化的抑制效应大于等N 量粪肥。C/N值小且导致土壤酸化的作物残茬对CH4 氧化的抑制作用较大,生物废弃物堆肥对土壤CH4氧化有暂时抑制作用。灌溉和施用杀虫剂可减少土壤CH4 吸收量,免耕、施N3--N 肥和有机肥是维持与增加农田土壤CH4CH4吸收量的有效措施。

     

    Abstract: Tillage can largely reduce the soil CH4 sink because of its long inhibition on soil CH4 uptake.Ammonium can inhibit CH4 oxidation in the soi1 but nitrate can not do that.The effect of ammonium inhibition on soil CH4 oxidation is better than the manure with the same amount of nitrogen as ammonium.Crop residue that has small C/N ratio or can lead to soil acidification has a large inhibition on soll CH4 oxidation.Biowaste compost has a short-term inhibition on soll CH4 oxidation.Irrigation and the use of pesticide can decrease the soil CK,uptake.No-tillage,application of ammonium and organic fertilizer are the available measures to remain or increase the potential of CH4 uptake in arable soil.

     

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