论文部分内容阅读
采用长期定位试验方法,研究分析了秸秆还田对黄土高原旱塬地土壤肥力的影响。结果表明:经过24a的长期施肥,表层土壤碱解氮、有效磷含量呈下降趋势,土壤有机质、全氮、全磷均呈现出不同程度的富集趋势;秸秆与化肥配合施用时土壤有机质、全氮、全磷的富集效应较明显,长期施用秸秆能加快土壤有机质转化速率,降低有机质的氧化稳定性,提高土壤肥力。长期秸秆还田对剖面养分的影响表现为随着土层的加深,养分含量呈现出减少趋势,有机质和全氮的的变化趋势基本相同,全磷含量在耕层较高,在80 cm土层形成最低值。
Long-term experiment was conducted to study the effects of straw returning on soil fertility in the dry land of the Loess Plateau. The results showed that after 24 years of long-term fertilization, the contents of available nitrogen and available phosphorus in surface soils tended to decrease, and the concentrations of organic matter, total nitrogen and total phosphorus showed different degrees of enrichment; The enrichment effect of nitrogen and total phosphorus is obvious. Long-term application of straw can accelerate the conversion rate of soil organic matter, reduce the oxidation stability of organic matter and improve soil fertility. The effect of long-term straw returning on nutrients in the section was as follows: the nutrient content decreased with the deepening of the soil layer, the change trend of organic matter and total nitrogen was basically the same, and the total phosphorus content was higher in the topsoil, Form the lowest value.