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利用田间定位试验,研究了长期施用有机肥和化肥对黑土团聚化作用及碳、氮含量的影响。团聚体分级结果表明,小团聚体是土壤的主要组成部分,占土壤重量的48.86%~60.24%。长期施用有机肥可显著增加土壤中大团聚体的比例,提高土壤团聚体的稳定性;而化肥的施用则增加了土壤中微团聚体和粉+黏粒的含量,降低土壤团聚体的稳定性。施用有机肥能显著增加土壤有机碳和总氮的含量,而化肥只有与有机肥配施时才能显著增加土壤有机碳和总氮的含量。有机肥的施用能够降低土壤C/N,表明有机肥的施用更有利于土壤氮素水平的提高。
Field experiment was conducted to study the effects of long-term application of organic fertilizer and chemical fertilizers on agglomeration of black soil and carbon and nitrogen contents. Aggregate grading results showed that small aggregates were the major component of soil, accounting for 48.86% -60.24% of soil weight. Long-term application of organic fertilizer can significantly increase the proportion of large aggregates in soil, and improve the stability of soil aggregates; while the application of chemical fertilizers increases the content of microaggregates and powder + clay in soil, and reduces the stability of soil aggregates . The application of organic manure can significantly increase the content of soil organic carbon and total nitrogen, while the chemical fertilizer can only significantly increase the content of soil organic carbon and total nitrogen when applied with organic manure. The application of organic fertilizer can reduce soil C / N, indicating that the application of organic fertilizer is more conducive to the improvement of soil nitrogen level.