Relations of Soil Physicochemical Properties and Soil Enzyme Activities with Plant C and N in Yulin Area of North Shaanxi Province

Using methodology of the temporal for spatial,this paper studies relation of soil physicochemical properties and soil enzymatic activities with plant organic C and total N in different desert lands in Yulin Prefecture,North Shaanxi Province.Results showed that with process of increasing desertification,soil physicochemical properties changed regularly.At same time,soil pH value in different profiles at same desertification degree increased with soil depth increasing and soil urease activity was reduced sharply although variation of soil pH value was not so obvious.Soil catalase activity in whole profile was relatively higher and it first decreased and then increased with profile depth increasing.Correlation analysis showed that in study area,there was little relevance between soil pH value and other factors and a close correlation among all factors except soil pH value.Except plants and soil C/N value,the correlation between soil bulk density and other indexes was negative and correlation among other indicators was positive.