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经8年田间定位试验,研究了不同施肥制度下褐土及其微团聚体碳、氮分布规律,从各级微团聚体组成变化及碳、氮储量角度探讨了不同施肥制度下土壤肥力的变化实质。结果表明,不同施肥制度下土壤微团聚体组成变化各异,不施肥和单施常量NPK化肥主要是由于10~50μm粒级碳、氮储量降低而造成土壤肥力下降;增量NPK化肥可保持肥力不降低,但投入较高;有机肥(物)料配施常量NPK化肥则主要通过增加大粒级特别是10~50μm粒级碳、氮储量而使土壤肥力水平得到提高。采用有机肥(物)料配施常量NPK化肥是改善褐土肥力的有效措施。
After eight years of field experiment, the distribution of carbon and nitrogen in the cinnamon soil and its micro-aggregates under different fertilization regimes was studied. The changes of soil fertility under different fertilization regimes were discussed from the micro-aggregates composition and carbon and nitrogen reserves at all levels substance. The results showed that the composition of soil microaggregates varied with different fertilization systems. The NPK fertilizers without fertilizers and single application of NPK fertilizers were mainly due to the decreased soil fertility due to the decrease of grain-size carbon and nitrogen reserves of 10-50 μm and the increase of NPK fertilizers While the inputs are higher. However, the application of organic fertilizers with NPK fertilizer increases soil fertility level mainly by increasing grain size, especially 10-50 μm grain-size carbon and nitrogen reserves. It is an effective measure to improve the fertility of cinnamon soil by using organic fertilizers together with NPK fertilizer.