Comparative Study Of Soil Fertility In Greenbelt Soil Of The Sub-regions Of Chengdu

Based on different loop in Cheng du urban green space as an example, discusses the soil fertility of urban green space and its correlation, compare different loop soil characteristics of urban green space. In order to forecast soil development and utilization and protection, urbanization and industrialization provides the basis for soil environmental changes caused by the trend.With different loop in Cheng du urban green space for the test soil were used as material, through five circle soil samples collection and determination of soil fertility index analysis, and correlation analysis, reveals the spatial distribution characteristics of the study area soil fertility index, the following conclusions:(1) Soil pH range of7.04～7.04, the mean value of7.54; Average content of organic carbon content is18.00g/kg, the lack of horizontal; Average easy oxidation of organic carbon content is3.40g/kg; Total nitrogen average of0.56g/kg, average of47.26mg/kg, alkali solution nitrogen content is low; Available p in total phosphorus average of2.79g/kg,14.07mg/kg, obvious enrichment; Averages of25.52g/kg a total potassium, available potassium79mg/kg, in the lack of state; Effective iron full iron average of49.83g/kg,2.8mg/kg, there was no significant iron deficiency phenomenon as a whole.(2) Between different loop, Urban green space order of soil total organic carbon content: Second ring road>Inside ring road> First ring road>Outside ring road>Third ring road; Oxidation of organic carbon content size order:Inside ring road> Second ring road> First ring road> Outside ring road> Third ring road; Soil total nitrogen content size order:Second ring road> Inside ring road> First ring road> Third ring road> Outside ring road; Alkaline hydrolysis nitrogen size order:First ring road> Second ring road> Inside ring road> Outside ring road> Third ring road; High and low for soil total phosphorus content:First ring road> Second ring road> Outside ring road> Third ring road> Inside ring road; Effective phosphorus content size order:First ring road> Outside ring road> Third ring road> Second ring road> Inside ring road; Soil total potassium distribution characteristics for performance:First ring road> Third ring road> Second ring road> Outside ring road> Inside ring road; Soil available k distribution is shown as:First ring road> Third ring road> Second ring road> Outside ring road> Inside ring road; Soil total iron distribution characteristics as follows:Third ring road> First ring road> Outside ring road> Inside ring road> Second ring road; Effective iron content size order for:Third ring road> First ring road> Outside ring road> Inside ring road> Second ring road.(3) The correlation analysis showed that soil pH and soil nitrogen, phosphorus, potassium, iron had no obvious correlation between; Each loop of soil organic matter content and soil total nitrogen, alkali solution nitrogen were significantly positive correlation, and soil total phosphorus, available phosphorus, total potassium, available potassium, total iron, no significant correlation between effective iron, and the soil Kos value of soil total phosphorus and available phosphorus all have significant impact.(4) Greening and artificial vegetation is better, most are man-made disturbed soil, soil total organic carbon is showing a lack of, but better than the third, alkali solution nitrogen, effective phosphorus content is highest. On rich ecological landscape construction, soil effective iron content is highest, easy oxidation of organic carbon, alkali solution nitrogen, rapidly-available potassium, iron content is also more effectively. Third ring road in the transition region, industrial organic pollution is serious, easy oxidation of soil total organic carbon, organic carbon, alkali solution nitrogen, rapidly-available potassium, iron are in the lowest state effectively, effective phosphorus content also, but the total nitrogen, total potassium, total iron content is highest, the total phosphorus content. Vegetation coverage rate is higher than the ring and on March around the city suburb, but organic pollution is serious, the soil pH, total nitrogen, alkali-hydrolysable nitrogen, total organic carbon, easy oxidation of organic carbon on the high side, but due to the inside of the ring around the outside interference to some less, ring inside the easy oxidation of soil organic carbon, alkaline hydrolysis n, available k were higher than round outside.