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利用大田试验,研究了免耕+秸秆还田、免耕、常耕+秸秆还田、常耕4种耕作方式对稻田土壤剖面不同层次土壤酶活性的影响.结果表明:4种耕作方式的酶活性在土壤剖面上表现为上层高于下层,其中免耕+秸秆处理上、下土层间的差异大于其他处理.上层土壤的脲酶、酸性磷酸酶、蛋白酶和纤维素酶活性为免耕处理大于常耕处理,有秸秆还田处理大于无秸秆还田处理,以免耕+秸秆处理最高,常耕处理最低;下层土壤4种酶活性以常耕+秸秆处理最高,免耕+秸秆处理次之,免耕和常耕处理较低.水稻不同生育时期,脲酶和纤维素酶活性在分蘖期较低,增加至孕穗期达到峰值,至成熟时又降至低值;酸性磷酸酶活性以分蘖期较高,拔节期较低;蛋白酶活性在分蘖期和抽穗期分别出现峰值.
Field experiments were conducted to study the effects of no-tillage, straw-returning, no-tillage, conventional tillage and straw-returning on the soil enzyme activities at different soil layers in paddy fields. The results showed that: Activity in the soil profile showed that the upper layer was higher than the lower layer, of which no-tillage + straw treatment of upper and lower soil layer difference is greater than other treatments.The upper soil urease, acid phosphatase, protease and cellulase activity is no-tillage treatment is greater than The no-tillage + straw treatment had the highest tillage treatment and the lowest tillage treatment. The four soil enzyme activities in the lower soil layer were the highest in the treatments of no-tillage + straw treatment , No-tillage and low-tillage treatment.Under different growth stages, the activities of urease and cellulase were lower at tillering stage and reached the peak at booting stage, then decreased to low values at maturity stage.The activities of acid phosphatase at tillering stage Higher, jointing stage lower; protease activity peaked at tillering stage and heading stage respectively.