Study The Soil Active Organic Carbon, Soil Enzyme Activity And Soil Nutrients On Different Land Use Of Qinwangchuan Irrigated Area

This paper Study on in Qinwangchuan irrigation district three kind of differentland use way (cultivated land, Orchard, and wasteland) easy oxidation carbon, andmicrobial the amount of carbon, and water-soluble carbon, and CPMI (carbon pool management index), hydrogen peroxide enzyme, and urea enzyme, and sucrose enzyme such as soil enzyme activity content and the profile distribution law of, soil organic matter, and all nitrogen, and alkali solutions for nitrogen, and quick-impact phosphorus, and quick-impact potassium such as nutrient factor content, analysis ofSoil enzyme activity and soil nutrient each other relationship, Soil enzyme activity and soil activity organic carbon library each other relationship, For further discussionon soil enzyme activities will provide the theoretical basis for characterization of soil fertility;. And for the sustainable development of irrigation soil management, soilproductivity initiatives.1. This paper investigated the measurement of active organic carbon pool content and3kinds of labile carbon: readily oxidation carbon, microbial biomass carbonand water soluble organic carbon and under three kinds of land use types(including cultivated land, garden land, wasteland), The results showed: Respective contentof active organic carbon pool and three kinds of labile active organic carbon poolof all manifest that cultivated land>garden land>wasteland, The profile distribution of soil active organic carbon pool under different land use types appeared a declining trend with soil depth. The profile distribution of soil active organic carbon pool under different land use types appeared a declining trend with soil depth. The allocation proportion of ROC, MBC and WDOC in soil active organic carbon pool followed the order of cultivated land>garden land>wasteland, The allocation proportion ofsoil active organic carbon pool has a declining trend with depth, while that of WDOC is going to upon and comedown. The proportion of ROC in SOC is lower than0-20cm layers, in40-60cm layers of cultivated land and garden land, The proportion of ROC in SOC was higher than20-40cm layers, In wasteland, the ROC closed down slightly with pedophile deepened. The allocation proportion of MBC had a declining trend with depth. Under different land use, the same for cultivated land CPMI (carbon pool management index) cultivated land>garden land>wasteland, with the soil layer CPMI (carbon pool management index)(0-60cm) deepen and decline.2. Soil enzyme under different usages in Qin Wang Chuan Irrigation Area of the Lan Zhou city, Gansu province. The results show that there exist quite big differences between soil enzyme activity and nutrients under different land usages. The content of the activities of soil invertase, activities of urease, catalase activity, soil OM, Total N, Alkaline hydrolytic N all manifest that cultivated land>garden land>wasteland; the content of soil Readily available P and Readily available K are garden land>cultivated land>wasteland. Under different land usages, the activities of soil enzyme tend to decline with the deepening of soil layer between0-60cm:the activitiesof soil invertase, activities of urease, catalase activity are0-20cm>20-40cm>40-60cm.And that of0-20cm is remarkably higher that that of40-60cm. there exists a close relationship between invertase,and they represent a significant or very significant positive correlation, and these two kinds of enzyme activity are also represent significant positive correlation. Urease, invertase activity can be taken as an ideal soil nutrient characterization index of cultivated land and orchard land in the area. It represents a significant or very significant positive correlation between catalase and soil nutrients in waste land. but it has little difference between catalase and soil nutrientsin cultivated land and orchard land. Therefore, catalase activity can represent the soil fertility status of wasteland but not for that of fine farming land.3. Analysis shows that is easy to oxidize carbon and microbial biomass carbonin soil, water-soluble carbon and Enzyme Activity there is a significant positive correlation, cultivated land and three kinds of activity of catalase carbon does not thesignificant relationship, urease, invertase and three kinds of activated carbon to achieve very significant positive, urease, invertase activity on the activity of soil organic carbon and Organic Carbon changes reflect the more sensitive. gardenland, catalase activity and invertase associated with three types of activated carbon not remarkable significant, urease and is easy to oxidize carbon does not meet the significant positive, and microbial biomass carbon and water-soluble achieved significant positive, urease activity on the activity of soil organic carbon and active organic carbon pool changes reflect the more sensitive. wasteland catalase, invertase and three kinds of activated carbon to achieve very significant positive, urease and is easy to oxidizecarbon and water-soluble carbon does not meet the significant positive, and microbial biomass carbon achieved significant positive. Catalase, invertase on the activity of soil organic carbon and active organic carbon pool contents change to reflect more sensitive.