摘要
研究旨在明确稻麦轮作下秸秆还田对土壤基础养分的影响。以稻麦轮作系统为研究对象,采用Meta分析方法定量研究了土壤基础养分对秸秆还田的响应及其影响因素。结果表明,短期内(<2年)秸秆还田能够显著提升土壤有机碳和活性有机碳的含量,其中活性有机碳对秸秆还田的响应程度要高于总有机碳。低秸秆还田量(RS <3750 kg hm-2和WS <3000 kg hm-2)对土壤基础养分的提升效果不显著,而全量秸秆还田(RS 3000~6000 kg hm-2和WS 3750~7000 kg hm-2)能够显著提升土壤速效磷、有机碳和活性有机碳的含量。对于不同耕作措施而言,旋耕或翻耕措施均可以显著提升土壤有机碳的含量;此外,旋耕显著提高全氮和活性有机碳的含量,翻耕显著提高土壤速效磷和速效钾的含量。稻麦轮作下秸秆全量还田配合旋耕或者翻耕措施能够增加土壤基础养分含量,达到土壤地力培育的效果。
The meta-analysis method was adopted to investigate the response of soil basic nutrients to straw returning and their influencing factors in the rice-wheat rotation system. The straw returning to the field in the short term(< 2 years) significantly increased the contents of soil organic carbon(C) and active organic C. And the response of active organic C to straw returning was higher than that of total organic C. Low amounts of rice straw(RS) returning(< 3750 kg hm-2) and wheat straw(WS) returning(< 3000 kg hm-2) had no significant effects on the improvement of soil basic nutrients, while full straw returning(RS amount of 3000-6000 kg hm-2 and WS amount of 3750-7000 kg hm-2)significantly increased the contents of soil available phosphorus(P), organic C and active organic C. The content of soil organic C was significantly increased in the rotation tillage and plow tillage. Additionally, rotation tillage significantly increased the contents of total nitrogen and active organic C in soil, and plow tillage significantly increased the contents of soil available P and available potassium. The full straw returning to the field combined with rotary tillage or plow tillage increased the contents of soil nutrients in rice-wheat rotation system and could improve soil fertility.
引文
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