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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。
In this experiment, the effects of conventional ridge cultivation (NT), NT-0 without straw mulching and NT-100 with different soil layers (0 ~ 5 cm, 5 ~ 10 cm and 10 ~ 20 cm) The distribution characteristics of amino sugar content in different aggregate size fractions were analyzed. The results showed that no-tillage treatment significantly affected the aggregation of surface soil (0 ~ 10 cm) and promoted the conversion of microaggregates and small particle aggregates to large aggregates, compared with conventional tillage. In different soil layers, NT-0 did not change soil organic carbon content, while NT-100 significantly increased soil organic carbon content. In addition, NT-100 significantly promoted the accumulation of total amino sugars, glucosamine and galactosamine in the aggregates of 0-5 cm soil compared with NT-0 and RT, but did not produce significant changes in the soil layers of 5-20 cm influences. The results showed that no straw tillage without straw mulching had no effect on soil organic carbon and amino sugar content and the content of amino monosaccharides. Combined with straw mulching, soil organic carbon and amino sugar accumulation were significantly promoted.