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在河南省两个生态区进行2年定位试验,研究常规耕作+秸秆还田(CT)、深耕+秸秆还田(DT)和深耕-秸秆不还田(DNT)3种耕作方式对土壤肥力的影响。结果表明,深耕能够提高不同质地土壤的肥力。深耕后土壤全氮、有效磷和速效钾的含量在壤土上分别增加3.4%、14.2%、4.7%,在粘土上分别增加8.6%、7.6%、3.9%。秸秆还田能提高深耕后土壤的养分含量,在深耕条件下,秸秆还田后土壤有机质、全氮、有效磷和速效钾含量在壤土上分别增加3.0%、13.8%、11.0%和11.8%,在粘土上分别增加1.6%、20.2%、10.8%和6.0%。在深耕基础上,秸秆还田有利于土壤养分含量的提高,该效应受年份、土层深度和土壤质地的影响显著。
In the two ecotopes of Henan Province, a two-year experiment was conducted to study the effects of conventional tillage + CT, DT + DNT on soil fertility influences. The results show that deep plowing can improve soil fertility in different textures. After deep plowing, the content of soil total N, available phosphorus and available potassium in loam soil increased by 3.4%, 14.2% and 4.7% respectively, and increased by 8.6%, 7.6% and 3.9% respectively on clay. The soil organic matter content, total nitrogen content, available phosphorus content and available potassium content increased by 3.0%, 13.8%, 11.0% and 11.8% in the loam soil under the conditions of deep plowing under the condition of deep plowing. Increase by 1.6%, 20.2%, 10.8% and 6.0% respectively on clay. On the basis of deep plowing, straw return to soil is beneficial to the increase of soil nutrient content, which is significantly affected by year, soil depth and soil texture.