【摘要】 通过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有机碳活性变化规律。结果表明,褐土微团聚体有机碳活性随粒级的减小而增强,不同施肥制度下土壤微团聚体组成变化各异,不施肥主要是由于10~50μm粒级总有机碳和<10μm粒级易氧化有机碳储量减少而造成土壤有机碳活性降低,土壤肥力下降;单施常量NPK化肥处理呈同样的趋势;增量NPK化肥可保持有机碳活性和肥力不降低,但投入较高;有机肥(物)料配施常量NPK化肥主要是通过增加大粒级特别是10~50μm粒级总有机碳和易氧化有机碳储量而使有机碳活性和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。更多还原

【Abstract】 Eight years’ location experiment was conducted in cinnamon soil in Hebei province to study the changes of organic carbon activity in soil and its micro-aggregates.The results showed that with the size of micro-aggregates decreased,organic carbon activity in cinnamon soil micro-aggregates is increased.The composition of soil micro-aggregates is different under different fertilization regimes.No fertilization and application the constant NPK fertilizers mainly decrease the storage of total organic carbon in 10～50 μm and readily oxidizable organic carbon in <10 μm,and result in soil organic carbon activity and fertility decrease.Application the increment NPK fertilizers can maintain the soil fertility,but the input is high.Application organic manure combined with constant NPK fertilizers mainly increases the storage of total organic carbon and readily oxidizable organic carbon in bigger sizes,especially in 10～50 μm micro-aggregates,and improves soil organic carbon activity and fertility.And it is the most effective way to improve soil fertility.更多还原