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对中层黑土上连续监测了6年的玉米免耕和秋翻两种耕作处理下的耕层土壤有机碳、全氮和速效氮、磷、钾进行了分析。结果表明:耕作处理对土壤养分的影响主要表现在不同的土壤深度上,免耕造成了土壤有机碳和全氮的分层化,即表层0~5 cm有机碳和全氮含量明显高于亚表层,而秋翻土壤有机碳和全氮分布则比较均匀。免耕处理的速效养分均表现为表层与亚表层存在明显差异。免耕处理下有机碳、全氮和速效氮、磷、钾在土壤表层发生明显富集。
Soil organic carbon, total nitrogen and available nitrogen, phosphorus and potassium in the topsoil were monitored on the mid-level black soil continuously for six years under both no-tillage and autumn-tillage treatments. The results showed that the effects of tillage treatments on soil nutrients were mainly at different depths of soil. Tillage resulted in the stratification of soil organic carbon and total nitrogen, that is, the contents of organic carbon and total nitrogen in the 0-5 cm layer were significantly higher than those in sub-layer Surface layer, while autumn soil organic carbon and total nitrogen distribution is more uniform. No-tillage treatment of available nutrients showed the surface and subsurface there are significant differences. No-tillage treatment of organic carbon, total nitrogen and available nitrogen, phosphorus and potassium were significantly enriched in the soil surface.