Effects of Different Land Use Patterns on Soil Enzyme Activities in the Yellow River Wetland of Shaanxi

The study investigated the activities of the soil enzymes of four different land use patterns in the Yellow River Wetland of Shaanxi in order to provide the basis for constructing well-performing digital models for wetland soil conservation and rehabilitation. Its results showed that: (1)the activities of the soil enzymes of the land use patterns generally varied in the order of abandoned farmland>;farmland>;wetland>;saline-alkali land and among the activities the alkaline phosphatase activities in particular varied most, And the variations in the soil enzyme activities of the different land types indicated the variations in soil fertilities of the land use patterns.(2)the activities of the soil enzymes as a whole decreased with the increasing soil depths in the soil profiles of the different land types, and their variations significantly differed from one another, and the alkaline phosphatase and invertase were most sensitive to their environmental moistures, phosphorous, roots and carbohydrate, and compared with the activities of the other soil enzymes they were stronger wetland soil bioactivity indicators. (3) Different correlations among the activities of the four soil enzymes indicated that the soil enzymes not only specifically but also collectively and synergistically acted in promoting soil organic matter transformation and participating soil substance transformation and soil energy exchanges.