豫西旱坡地长期保护性耕作土壤酶活性及其与肥力关系

摘要

为探讨多年保护性耕作下土壤酶活性及其与土壤肥力的关系,对豫西旱区坡耕地定位试验第7年保护性耕作的土壤酶活性以及土壤养分进行了测定和分析.结果表明:深松覆盖和免耕覆盖能够提高3种酶活性,特别是能明显提高0～10 cm土层土壤酶活性,其中脲酶活性增加最多.脲酶与有机质、全磷、速效磷、速效钾、碱解氮呈显著或极显著相关关系,转化酶与全磷、全钾呈极显著相关,与速效磷显著相关,而过氧化氢酶只与全磷呈显著相关.脲酶活性可作为评价本生态类型土壤肥力的指标,过氧化氢酶可起辅助作用.%In order to explore soil enzyme activity and its relation to soil fertility under the circumstances of longterm conservation tillage, determination and analysis were conducted of the soil enzyme activity and soil fertility after 7 year conservation tillage in sloping dryland of west Henan Province. The results showed that the activity of soil urease,catalase and invertase increased obviously under sub-soiling tillage and no-tillage, especially the enzyme activity in 0 ～ 10 cm soil layer, and the soil urease activity increased most. The correlation analysis of soil enzyme activity showed that there was a positive correlation between urease and the content of organic matter, total P, available P, available K and available N, between invertase and the content of total P and total K, and between catalase and the content of total P. It indicated that soil urease activity can be used as an index of soil fertility, while catalase may play an auxiliary function.