秸秆覆盖免耕对土壤氨基糖在团聚体粒级中分布的影响

发布时间：2018-06-06 16:37

本文选题：免耕 + 团聚体粒级　；参考：《土壤通报》2017年02期

【摘要】：本试验对常规垄作(RT)、无秸秆覆盖免耕(NT-0)和全量秸秆覆盖免耕(NT-100)下不同土层(0~5 cm、5~10 cm、10~20 cm)氨基糖含量在不同团聚体粒级中的分布特征进行了分析。结果表明,与传统耕作相比,免耕处理显著影响了表层土壤(0~10 cm)的团聚化作用,促进了微团聚体和小颗粒大团聚体向大团聚体的转化。在不同的土壤层次,NT-0没有改变土壤有机碳含量,而NT-100显著增加了土壤有机碳含量。另外,相对于NT-0和RT,NT-100显著促进了0~5 cm土壤各团聚体粒级中总氨基糖、氨基葡萄糖和氨基半乳糖的积累,而在5~20cm土层没有产生显著影响。研究表明,免耕无秸秆覆盖对土壤有机碳、氨基糖含量以及各氨基单糖含量没有影响,而结合秸秆覆盖则显著促进了表层土壤有机碳以及氨基糖的积累。
[Abstract]:The distribution characteristics of amino sugar content in different soil layers (0 ~ 5 cm ~ (5) ~ 10 cm ~ (10) ~ (20) cm ~ (-1) in different soil layers were analyzed under conventional ridge cropping, no tillage without straw mulching (NT-0) and full straw mulching (NT-100). The results showed that compared with traditional tillage, no-tillage treatment significantly affected the agglomeration of topsoil (10 cm) and promoted the transformation of microaggregate and small particle aggregate to large aggregate. At different soil levels, NT-0 did not change soil organic carbon content, but NT-100 significantly increased soil organic carbon content. In addition, compared with NT-0 and RTN NT-100, the accumulation of total glucosamine, glucosamine and galactose in 5 cm soil was significantly increased, but there was no significant effect on the accumulation of glucosamine, glucosamine and galactose in 5~20cm soil layer. The results showed that no-tillage straw mulching had no effect on soil organic carbon, amino sugar content and amino monosaccharide content, but combined straw mulch significantly promoted the accumulation of organic carbon and amino sugar in surface soil.
【作者单位】：中国科学院沈阳应用生态研究所;中国科学院大学;吉林省梨树县农业技术推广总站;
【基金】：国家自然科学基金项目(41671297) 国家重点研发计划项目(No.2016YFD0200307)资助
【分类号】：S153

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