Study On Spatial Differentiation Of Soil Nutrients And Salinity In The Xarxili Region

In this study,the Xarxili region was taken as the study area,using the traditional statistical method and geostatistical theory method,the change of soil nutrient and salt content and the abundance and deficiency in each region were studied by using mathematical statistical software and spatial analysis software.The optimal semivariogram model was established and the spatial distribution of soil nutrients and salinity and its influencing factors were systematically analyzed.Here are the main findings:(1)The contents of organic matter,available phosphorus and available potassium in oasis,mountain forest and desert are:available potassium>available phosphorus>organic matter;The variation coefficients of soil nutrients were:organic matter>available phosphorus>available potassium.(2)The total salt content of the three regions was higher than that of other ions;CO₃^2-was the lowest in the three regions.CO₃^2-was the largest coefficient of variation in oasis and mountain forest,while SO₄^2-and total salt were the least.The largest variation coefficient in the desert was total salt,and the smallest was SO₄^2-.(3)There was a strong spatial correlation between the organic matter in the oasis area and the mountainous forest area at the soil depth of 40cm;The spatial correlation of available potassium in oases and forests was moderate at soil depth of40cm;The spatial correlation of available p was weak in all three regions.(4)The spatial correlation of Ca²⁺between oasis and mountain forest was strong at soil depth of 40cm,K⁺+Na⁺showed moderate and weak spatial correlation at soil depth of 20cm and 50cm,respectively.The spatial correlation of HCO₃^-in desert area is strong;The spatial correlation of total salt,Ca²⁺and K⁺+Na⁺was moderate;The weak spatial correlations were Cl^-,Mg²⁺and SO₄^2-.(5)Available p and available k were distributed in the east high and the west low at soil depth of 50cm;Organic and available phosphorus were evenly distributed at the depth of 30cm.The distribution of organic matter in the soil depth of 20cm and40cm was high in the north and low in the south.Available p decreased from the middle to the east and west of the soil at a depth of 20cm.(6)Total salt,Cl^-,Mg²⁺and K⁺+Na⁺were distributed in the east and west at a depth of 20cm.Ca²⁺and HCO₃^-were higher in the east and west than in the middle at 20cm.Total salt,Ca²⁺,Cl^-,Mg²⁺,SO₄^2-and K⁺+Na⁺were evenly distributed at the soil depth of 50cm.