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研究了稻-麦轮作系统中空气CO2浓度增高(200μmol·mol^-1)对土壤蔗糖酶、木聚糖酶、纤维素酶活性及土壤氮、磷、硫含量变化的影响.结果表明,与对照相比,种植小麦和水稻条件下FACE处理的土壤蔗糖酶活性升高;木聚糖酶活性在小麦的拔节期、抽穗期和成熟期以及水稻的抽穗期和成熟期显著高于对照;纤维素酶活性略降、相关分析表明,土壤碱解态氮含量与蔗糖酶之间呈显著的线性正相关关系.  相似文献
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New data on the enzymatic activity of the tundra peaty gleyey soil and permafrost sediments of Late Pleistocene age (11–25 thousand years) are analyzed. It is shown that invertase, protease, phosphatase, catalase, and peroxidase are well conserved in yedoma and in buried soil horizons; urease is conserved to a smaller extent. On the basis of the investigation of thermodynamic characteristics of active invertase, such as temperature coefficient and activation energy, it was established that this enzyme is present in soil in the free and bound forms (immobilized on the surface of organomineral colloids). The degree of immobilization of active invertase in the buried soil horizons is high, which plays an important part in the long-term conservation of its molecules at subzero temperatures.  相似文献
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