Analysis Of Nutrient Elements Distribution And Its Influencing Factors In The West Of Linshui County,Sichuan Province

Linshui County,Guang’an City,Sichuan Province is located in the eastern part of Sichuan Province.It is a county with a population of one million.It is also the closest county in Sichuan Province to the main urban area of Chongqing.It is located in the upper reaches of the Yangtze River Economic Belt and has a very advantageous geographical location.It is a cooperation between Sichuan and Chongqing.Forefront.Through the 1:50000 land quality geochemical survey in the western research area of Linshui County,the distribution of nutrient elements in the soil in the research area was initially ascertained,and the annual input and output flux of the element was calculated using Se element as an example.Finally,It tries to explain the distribution of nutrient elements through four aspects:different soil parent materials,different land use types,soil chemical properties,and different soil types.The soil N,P,K and other large nutrient elements in the study area are slightly lower than the national average value of surface soil and the average value of surface soil in Sichuan Province.Micronutrient elements such as TFe₂O₃,Mn,Zn and healthy elements such as Se,I,and F are all in Sichuan Province The average value of surface soil and the fluctuations near the average value of surface soil in the country are slightly higher or lower.From the geochemical map,the distribution of nutrient elements is inseparable from the local geological background.The metal nutrient elements in Huaying Mountain are often higher than in Xicao.In terms of soil nutrient levels,except for Zn,Cu,Mo,and F,where the first-and second-class land dominates,the other elements have less than half of the first and second-class content.The comprehensive levels of nutrients in the western area of Linshui County are mainly medium and relatively deficient,and the sum of the two is close to 90%.It can be explained that the soil nutrients in the western Linshui County are mainly medium and relatively lacking.Through the calculation of the input and output fluxes of Se in the study area,it can be roughly known that the soil Se in the study area is in a cumulative state as a whole,and the contribution of precipitation and atmospheric dry-wet sedimentation to the local soil accumulation is small.Infiltration water And crop harvesting is the main route for the loss of the local Se element in Linshui County.The local area has the natural advantage of developing selenium-rich agricultural products and selenium-rich farmland.The soil p H value in the study area is positively correlated with most of the nutrient elements in the soil.There are differences in the nutrient content of different soil types in the study area,and due to the secondary enrichment of carbonate,the content of beneficial elements in Huaying Mountain is significantly higher.Combined with the local actual conditions,it is helpful to the development of selenium-rich farmland.