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采用非缓冲液法,研究渭北旱塬苹果园不同层次土壤磷酸酶、转化酶、脲酶、过氧化氢酶、脱氢酶活性特征,探讨其与土壤肥力的关系,构建土壤总体酶活性参数。结果表明:土壤磷酸酶、转化酶、脲酶、脱氢酶活性的空间变异性明显,随剖面深度增加而降低,对肥力和环境变化较敏感,与多数土壤化学性质呈显著或极显著正相关,显示其在一定程度上可表征果园土壤肥力水平;而过氧化氢酶的变化规律性较差;土壤化学性质与酶活性主成分分析组成的土壤肥力信息系统较好地表征了土壤肥力水平的差异,获得的综合得分,计算的土壤总体酶活性参数(TEI)与土壤理化性质达显著或极显著正相关,且尤以TEI的相关性最高。不同层次的土样表现出类似的规律性变化。显示出TEI比单一酶系可更好地表征土壤肥力水平。
The non-buffer method was used to study the characteristics of soil phosphatase, invertase, urease, catalase and dehydrogenase activities in apple orchards in Weibei dry-land. The relationships between soil fertility and soil fertility were discussed, and the total enzyme activity parameters were established. The results showed that the spatial variability of soil phosphatase, invertase, urease and dehydrogenase activity was obviously decreased with the increase of depth and was sensitive to the changes of soil fertility and environment. The spatial variability of soil phosphatase, invertase, urease and dehydrogenase activity was significantly or very significantly positively correlated with soil chemical properties, Indicating that it can characterize the fertility level of orchard soil to a certain extent; however, the variation regularity of catalase is poor. The information system of soil fertility composed of chemical composition of soil chemistry and enzyme activity characterizes the difference of soil fertility , The comprehensive scores obtained, the calculated total soil enzyme activity parameters (TEI) and soil physical and chemical properties of significant or very significant positive correlation, and especially TEI highest correlation. Soil samples at different levels show similar regularity changes. It has been shown that TEI can better characterize soil fertility levels than a single enzyme system.