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《Acta Agrestia Sinica》 2005-03
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Urease Activity in the Loess Hilly Grassland Soil and its Relationship to Soil Property

AN Shao-shan~(1,2), HUANG Yi-mei~2, ZHENG Fen-li~(1,2)(1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi Province 712100, China;2.Northwest University of Science and Technology of Agriculture and Forestry, Yangling, Shaanxi Province 712100, China)  
The soil longitudinal sections of different plant populations during different stages of vegetation succession show that the urease activities are more intense in the upper than in the under layers. The activities abate slowly but evenly, with notable differences layer by layer. The highest content of surface soil urease activity reaches 186.4 mg·kg~(-1)h~(-1),while the lowest content amounts to 72.1 mg·kg~(-1).h~(-1). With the deve-loping vegetation succession, the activities of the soil enzymes gradually increase, while the ratio of the surface enzymes activities decrease. Urease activities in the natural soil show a positive correlation with organic matter, total nitrogen, total phosphorus, and available nitrogen, a significant positive correlation with available potassium, and a significant negative correlation with calcium carbonate (CaCO_3). The result of the path analysis shows that the direct acting coefficient of soil chemical and physical factors to the soil urease activity is in the following order: Total NCaCO_3Organic matterSoil pHTotal phosphorus. The soil total nitrogen tops all the other factors in the direct acting coefficient and enacts an indirect coefficient to the urease activity through the organic matter and total phosphorus, indicating that it affects both directly and indirectly to the urease activities. The organic matter does not effect directly on the urease activity, but indirectly through total nitrogern and total phosphorus, which means that organic matter enacts only an indirect effect to the urease activity. Other factors like total phosphorus, available nitrogen, and cation exchange capacity effect only limited direct or indirect coefficient on the urease activities. They are not factors affecting the soil urease activity.
【Fund】: 国家自然科学基金(40461006);; 西北农林科技大学优秀人才专项基金(04ZX011)
【CateGory Index】: S812.2;
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