Effect of different land utilization on soil nutrient and soil enzyme in Loess Plateau

To study the effects of different land utilization on soil fertility and enzyme activity in Wuqi county,the research was designed to deal with the different land utilization by the survey of the soil vegetation,the sample test and the indoor analysis.The results indicated that the content of organic matter of the natural meadow and the arbor forest land in the 0-20 cm surface soil grew separately by 36.11% and 32.96%;the nitrogen content of the natural meadow and the arbor forest land was also high,being 66.88 mg/kg and 69.37 mg/kg,respectively;the content of fast-acting potassium in the surface soil was higher than that of meadow,while the activity of the urea enzyme,alkaline phosphatese and sucrase of the arbor forest land was stronger than that of the other four land utilization modes.Enzyme activities in 0-20 cm layer were stronger than those in the 20-40 cm layer,which showed that the manual-planted arbor forest could make the soil hydrolytic enzyme activities strong,especially in the surface layer.In short,the arbor forest land could enhance soil organic matter,nutrients and enzyme activities significantly.