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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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冻融过程不同粒径土壤n2o排放特征
DOI: 10.3724/SP.J.1145.2010.00126, PP. 126-128
Keywords: 土壤冻融,土壤粒径,氮素,n2o排放通量,土壤团聚体
Abstract:
通过室内模拟的方法，研究了潮土两种粒径范围（≤1cm粒径，简称1cm粒径；≤0.25mm，简称0.25mm粒径）土壤在冻融过程中n2o排放的特征.结果表明，冻结前，0.25mm粒径土壤n2o排放通量比1cm粒径土壤平均高26.5%；冻结过程中，0.25mm粒径土壤比1cm粒径土壤较早达到稳定冻结状态（分别在冻结1410min和2610min时），并且在稳定冻结状态下，0.25mm粒径土壤n2o排放通量小于1cm粒径土壤；融化阶段，0.25mm粒径土壤比1cm粒径土壤较早出现n2o排放通量高峰（分别在融化2670min和2790min时），并且其峰值小于1cm粒径土样.1cm粒径土壤在冻结过程、融化过程和整个冻融过程中，土壤平均n2o排放量分别比0.25mm粒径土壤多3952.74、1512.51和5465.25μgm-2，相应增加76.83%、18.65%和41.23%.建议在土壤冻结前平整土地以减少n2o排放.图2参23
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