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试验采用小区定位法,研究了玉米-大豆隔年轮作免耕条件下,0%、30%、60%、100%四种秸秆还田量对土壤酶活性的影响,及其与土壤养分的相关性,以期从土壤酶学角度确定免耕条件下适宜的秸秆还田量。结果表明,秸秆还田能够增加土壤脲酶(6.3%~43.5%)、酸性磷酸酶(4.9%~22.2%)、蔗糖酶(3.1%~34.6%)和过氧化氢酶的活性(7.3%~56.0%),且对表层(0~10 cm)土壤的酶活性影响较大;酶活性的增幅受秸秆还田量的影响,各种酶活性至60%秸秆还田量时达到较高值,影响顺序为60%处理>100%处理>30%处理>0%处理;另外,土壤酶活性与土壤养分含量的存在显著相关性。
In the experiment, the cell localization method was used to study the effects of four kinds of straw returning on soil enzyme activities under 0 ~ 30%, 60% and 100% maize-soybean non-tillage rotation, and their correlations with soil nutrients , With a view to determine the appropriate amount of straw returning under no-till conditions from the perspective of soil enzymology. The results showed that straw returning could increase the activities of soil urease (6.3% -43.5%), acid phosphatase (4.9-22.2%), invertase (3.1% -34.6%) and catalase %), And had a significant effect on the enzyme activities in the surface soil (0 ~ 10 cm). The increase of enzyme activity was affected by the amount of straw returned to the field, and reached the highest values when the enzyme activities reached 60% The order was 60% treatment> 100% treatment> 30% treatment> 0% treatment. In addition, soil enzyme activity was significantly correlated with soil nutrient content.