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水稻秸秆还田对于增加土壤有机质,减少碳排放具有重要意义。试验针对寒地水稻,在连续三年水稻秸秆还田条件下,研究了秸秆还田对土壤溶液中氮、磷、钾含量和土壤酶活性的影响。结果表明:水稻生育期间,秸秆还田与不还田处理土壤溶液中无机氮含量均呈现降低升高再降低的变化动态;土壤溶液中磷、钾含量呈逐渐降低的变化趋势;秸秆还田使水稻分蘖期土壤溶液中无机氮含量和整个生育期间土壤溶液中磷含量降低,增加了钾的含量。秸秆还田处理降低了土壤脲酶的活性,提高了蔗糖酶活性,对酸性磷酸酶和过氧化氢酶无明显影响。
Rice straw to increase soil organic matter, reduce carbon emissions is of great significance. Experiments were conducted to investigate the effect of straw returning on the contents of nitrogen, phosphorus and potassium and soil enzyme activities in soil soils for three years in a row in paddy field. The results showed that during the growth period of rice, the content of inorganic nitrogen in soil solution decreased and then decreased with the straw returning and non-returning treatments. The content of phosphorus and potassium in soil solution decreased gradually. The straw returning The content of inorganic nitrogen in soil solution at tillering stage and the content of phosphorus in soil solution during the whole growth period increased and the content of potassium increased. Straw treatment reduced soil urease activity, increased sucrase activity, and had no significant effect on acid phosphatase and catalase.