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耕作方式对土壤有机碳库的影响

Keywords: 耕作方式,土壤有机碳,土壤微生物量碳,产量

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Abstract:

通过在甘肃中部干旱半干旱农业区进行6a的田间定位试验,探讨了传统耕作(T)、免耕(NT)、免耕+秸秆覆盖(NTS)以及传统耕作+秸秆还田(TS)等处理对土壤有机碳库的影响。结果表明,在0~30cm土层中,NTS、TS、NT处理土壤有机碳含量分别比T处理提高了5.09%、2.64%和4.08%;与T处理相比,NTS、TS、NT处理土壤微生物量碳含量分别增加了69.67%、47.72%和33.22%。NTS、TS、NT处理有利于土壤有机碳的累积。不同处理(NTS、TS、NT、T)条件下土壤有机碳和微生物量碳在土壤剖面分布是随着土层深度的增加而呈现递减趋势。

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