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结合野外调查与室内分析,研究了黄土高原沟壑区小流域自然坡面和不同植被恢复条件下剖面土壤酶活性的分布特征,以及土壤酶活性对植被恢复的响应.结果表明:黄土高原沟壑区小流域坡地土壤的脲酶、蔗糖酶和碱性磷酸酶活性为高度变异指标,过氧化氢酶活性则为弱变异指标.土壤剖面酶活性受植被恢复措施的显著影响,随土层的加深,土壤脲酶、蔗糖酶和碱性磷酸酶活性逐渐降低,过氧化氢酶活性升高.3种水解酶活性之间呈显著正相关,并与土壤物理性质显著负相关,与土壤化学性质显著正相关;过氧化氢酶活性除与含水量和pH正相关外,与其他理化性质呈负相关.土壤水解酶类可以敏感指示植被恢复的土壤效应,植被恢复措施可以改善表层和深层土壤的生物学性质.
Based on the field investigation and laboratory analysis, the distribution characteristics of soil enzyme activities and the responses of soil enzyme activities to vegetation restoration were studied under the natural slope and vegetation restoration conditions of the small watershed in the gully region of the Loess Plateau. The results showed that: Urease, invertase and alkaline phosphatase activities were highly variable in soil and catalase activity was weak variation index in the slope.The soil enzyme activity was significantly affected by the vegetation restoration measures. With the deepening of the soil layer, soil urease , The activity of sucrase and alkaline phosphatase decreased gradually and the activity of catalase increased. There was a significant positive correlation between the three hydrolase activities and negatively correlated with soil physical properties and with soil chemical properties In addition to its positive correlation with water content and pH, the activities of catalase were negatively correlated with other physico-chemical properties. Soil hydrolases could sensitively indicate the soil effect of vegetation restoration. Vegetation restoration measures could improve the biological properties of surface and deep soils.