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通过设置在陇中黄土高原半干旱雨养农业区连续15年的保护性耕作长期定位试验,研究了传统耕作(T)、免耕(NT)、免耕结合秸秆覆盖(NTS)、传统耕作结合秸秆还田(TS)4种不同耕作措施下土壤蔗糖酶、淀粉酶、纤维素酶、过氧化物酶和脱氢酶在春小麦不同生育期的动态变化。结果表明:1)整个生育期0-30cm土层中,与T处理相比,NTS处理可以显著提高土壤蔗糖酶、淀粉酶、纤维素酶、过氧化物酶、脱氢酶活性,在整个生育期分别增加了45.28%、60.05%、42.86%、23.75%、31.79%;NT与TS对其表现出不同的阶段性效应。2)相关分析表明五种酶活性除蔗糖酶与过氧化物酶外,均达到极显著正相关。3)生育期与耕作措施对土壤酶活性的影响不同,其中生育期对上述研究的5种酶活性影响极显著,耕作措施对土壤蔗糖酶、淀粉酶、纤维素酶和脱氢酶影响极显著,二者交互作用对土壤淀粉酶、过氧化物酶及脱氢酶影响极显著。
Through the long-term conservation experiment of 15 years of long-term conservation tillage in the semi-arid rainfed farming area in the Longzhong Loess Plateau, the effects of conventional tillage (T), no-tillage (NT), no tillage combined with straw mulching Dynamic Changes of Soil Invertase, Amylase, Cellulase, Peroxidase and Dehydrogenase at Different Growth Stages of Spring Wheat under Different Tillage Practices with Straw Mulching and Straw Mulching. The results showed that: 1) Compared with T treatment, NTS treatment could significantly increase the activities of soil invertase, amylase, cellulase, peroxidase and dehydrogenase in 0-30cm soil layer during the whole growth period. Period increased by 45.28%, 60.05%, 42.86%, 23.75%, 31.79% respectively; NT and TS showed different stage effects on them. 2) Correlation analysis showed that all five enzymes had extremely significant positive correlations except sucrase and peroxidase. 3) The effects of growth period and tillage on soil enzyme activities were different, of which the growth periods had significant effects on the five activities of the above mentioned studies. The tillage practices had significant effects on soil invertase, amylase, cellulase and dehydrogenase , The interaction between the two has a significant impact on soil amylase, peroxidase and dehydrogenase.