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对科尔沁沙地不同样地生物结皮的理化性质以及土壤酶活性进行了研究,结果表明:①围封不同放牧梯度恢复样地和未围封放牧样地藓结皮的含水量、结皮厚度及有机质含量显著高于藻结皮(P<0.05),而pH值却低于藻结皮,说明藓结皮较藻结皮能更好地改善土壤理化性质;②中度、轻度放牧恢复样地藻结皮和藓结皮的4种酶活性均大于重牧区,说明适度放牧可以增加土壤的酶活性;③除多酚氧化酶外,脲酶、蛋白酶和转化酶均随土壤深度的增加而出现降低趋势,且结皮层土壤酶含量和层下土壤酶含量有显著差异(P<0.05),藓结皮脲酶、蛋白酶与转化酶的活性均大于藻结皮,其差异性与放牧强度有关.
The physical and chemical properties and soil enzyme activities of different kinds of biological crusts in Horqin sandy land were studied. The results showed that: (1) Water content of crusts in different grazing grazing plots and moss crusts of uncovered grazing land, crust thickness (P <0.05), but the pH value was lower than that of algal crust, which indicated that moss crust could better improve soil physical and chemical properties than algal crust; (2) Moderate and mild grazing restoration The activities of four enzymes in the soil crusts and the moss crusts were higher than those in the heavy pastoral areas, indicating that moderate grazing could increase the soil enzyme activity. Except polyphenol oxidase, urease, protease and invertase increased with soil depth (P <0.05). The activities of urease, protease and invertase were higher than that of algal crust, and the difference was related to the grazing intensity.