Effect Of Planting Years On Soil Organic Carbon And Enzyme Activity Of Jujube Orchard

Soil organic, a crucial component of soil, have significant influence on soil physical, chemical and fertility properties, as well as a decisive factor for evaluating soil quality. Soil enzyme is also an important component of soil and an index for soil biochemical characters. The content of soil enzyme activity has close correlation with organic carbon, physical and chemical properties and maturity of soil, which can reflect the capacity of nutrient transformation as well as an index for evaluating soil quality. Many soil enzymes have significant correlation with the content of soil organic. Research on the relationship between soil enzyme activity and soil organic carbon can master the soil physical and chemical properties, soil fertility and plant growth status, and provide scientific basis for better economic benefits. This study investigates the characteristics of soil organic carbon and enzymatic activity and their correlation by conducting the research on different planting histories jujube in 45 Crops in Maigaiti County, Xinjiang Province. The results are as follow:(1) The content of soil organic carbon experienced increasing trend and different accumulation content with the increasing of planting histories. The activity of soil carbon pool presented increasing to decreasing trend with the increasing of planting histories. CMPI have the maximum increase in 10 years planting histories, more increase in 15 years planting histories and minimum increase in 15 years planting histories.CMPI have an increased at first and followed decreasing trend. The activity of soil carbon pool has extremely significant correlation with labile organic carbon and significant correlation with soil organic carbon. CMPI also have extremely significant correlation with AI and CPI.(2) Planting histories have significant influence on soil enzyme activity in jujube orchard. The enzyme activity of soil urease, phosphatase and sucrose increased with the planting histories. However, the catalase activity showed increasing at first and followed decreasing trend. The activity of soil urease, sucrose and catalase enzyme generally decreases with the increasing of soil depth. Moreover, the enzyme activity of phosphatase experienced decreasing trend and followed increasing trend with that.(3) Accompany with the increasing of planting histories, the catalase, sucrose and urease enzyme have extremely or obvious significant correlation with soil organic carbon, available nitrogen, rapidly available phosphorus, rapidly available potassium. However, alkaline phosphatase has no significant correlation with the four soil nutrient. The content of soil organic carbon has extremely significant positive correlation with the activities of catalase, sucrose and urease enzyme and significant positive correlation with alkaline phosphatase activities. The correlation between soil enzyme activities and active organic carbon showed stronger that the correlation with total organic carbon. Regression analysis indicated that soil organic carbon all have positive effect on the activities of four enzymes, which exhibited a significant linear relation.