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中文摘要：
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.
英文摘要：
A field experiment was conducted to study the effects of four cultivation modes（conventional tillage,no-tillage,conventional tillage ＋ stubble-remaining,and no-tillage ＋ stubble-remaining） on the activities of urease,acid phosphatase,protease,and cellulose in different soil layers in a broadcasting rice seedlings paddy field.Under the four cultivation modes,the activities of test enzymes were higher in upper than in deeper soil layers,and had a greater difference between the soil layers under no-tillage ＋ stubble-remaining.In upper soil layers,the activities of test enzymes were higher in the treatments of no-tillage than in the treatments of conventional tillage,being the highest under no-tillage ＋ stubble-remaining and the lowest under conventional tillage.In deeper soil layers,the test enzyme activities were the highest under conventional tillage ＋ stubble-remaining,followed by no-tillage ＋ stubble-remaining,no-tillage,and conventional tillage.During the growth period of rice,soil urease and cellulose activities were lower at tillering stage,increased to the maximum at booting stage,and decreased then,soil acid phosphatase activity was higher at tillering stage but lower at elongating stage,whereas soil protease activity peaked at tillering and heading stages.
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