植被恢复对典型黑土表层土壤团聚体水解酶活性的影响

以典型黑土区耕地和14、23、50年生落叶松人工林表层土壤为研究对象,通过混合土壤和不同粒径(d)干筛团聚体中蔗糖酶、β-D葡萄糖苷酶、磷酸酶活性及土壤酶活性几何平均数等指标的测定、计算与分析,以期探究混合土壤和干筛团聚体之间酶活性的差异,揭示植被恢复对土壤团聚体水解酶活性的影响。结果表明,混合土壤酶活性显著低于团聚体酶活性(P0.05),表现出团聚体对土壤酶具有明显保护作用。植被恢复不同程度的提高了混合土壤和团聚体酶活性,其中以提高d≤1.00 mm各粒径团聚体酶活性及综合指标达到显著水平(P0.05),d≤1.00 mm粒径团聚体酶活性可以作为定量表征黑土区土壤生境质量变化的敏感指标。

Effect of Vegetation Restoration on Soil Aggregates Enzyme Activity in Typical Black Soil Region

The experiment was conducted to explore the differences of enzyme activities between homogenized soil and dry-sieved aggregates and reveal the effects of vegetation restoration on hydrolase activities in soil aggregates, and the topsoil in typical black soil region from Larix gmelini plantations at 14, 23 and 50 year-old and from farm-land was collected and compared by determining invertase, β-D-glucosidase, phosphatase activities, geometric mean of enzyme activities (Mg) and other related soil properties.The enzyme activity in homogenized soil was significantly (P<0.05) lower than those in aggregates, representing an obvious protective effect of aggregates on soil enzymes.Vegetation restoration improved enzyme activities both in homogenized and aggregates to various degrees and enzyme activities occlude in aggregates smaller than 1.00mm with P<0.05, and other comprehensive indexes were also parallel higher.Therefore, enzyme activities within d≤1.00mm size aggregates could be used as a sensitive index to quantitatively characterize the quality changes of soil habitat in black soil regions.