Geochemical Characteristics And Quality Evaluation Of Cultivated Land In Yangmei Town,Shuicheng County,Liupanshui City

As an important carrier of land,soil is a non-renewable natural resource and an important basis for human survival and sustainable development.In recent years,due to the development of modern industry and the increase of human activities.Soil environmental problems such as soil heavy metal pollution and soil fertility decline are deepening,resulting in the continuous reduction and degradation of available land resources.Nowadays,soil quality has become the focus of attention of governments and people.The soil environment can understand the elements and related geochemical indicators and distribution in the soil through land survey projects to improve the value of cultivated land use.In agricultural production,we can provide a rational land fertilization program and strive to build a green ecological agricultural production base.At the same time,it is also conducive to adjusting the agricultural planting structure,improving the quality of life of residents,and providing a scientific basis for ensuring the cultivation of safe and green agricultural products.This paper relies on the “Geochemical Survey and Evaluation Design of Cultivated Land Quality in Shuicheng County,Liupanshui City,Guizhou Province” project of Guizhou Province,and selects Yangmei Township as the research area to test 330 surface soil samples and conduct soil geochemical survey on the area.Research,using a variety of scientific basic theories and methods,based on the identification of the content characteristics and spatial distribution of nutrient elements and heavy metal elements in the study area,and then according to the land quality geochemical specifications(DZ/T0295-2016)The status of environmental quality of cultivated soil in the region was evaluated.Through the above research,the following conclusions were obtained:1.The results of geochemical evaluation of soil nutrients in the study area indicate that the content of N element is rich,mainly in primary and secondary.The P element is rich in content and rich in 46.25%,mainly in the first and fourth grades.The content of K element is low,and the lack of K element content and the lack of 86.6%.In the study area as a whole,soil nutrient elements are abundant,and most of the regional grades are medium and rich.The lack of element B content in the study area accounted for 32.7% of the lack of soil,and the rich and rich soil accounted for 60.6%.The distribution of Mn element content was similar to that of B element,but the Mn element was mainly rich in the study area.In the study area as a whole,the content of Mo is abundant,and the area is almost rich and rich.Se element is mainly rich in the study area,and the overall content level is medium and above.2.The geochemical evaluation results of the physical and chemical indicators in the study area showed that the average value of the pH value in the surface cultivated soil of the study area was 6.54,which was neutral.The soil in the working area was alkaline(pH 7.5-8.5)and acidic(pH 5.5-6.5)Main.The average content of organic matter in the surface cultivated soil of the study area was 3.74%,and the content level was mainly rich and abundant,and widely distributed in the study area.3.For the evaluation of soil environmental quality in the study area,the single factor index method shows that among the eight heavy metal elements,Cu and Cd are the main pollution,and the Cd element has the highest pollution degree.The results of the land accumulation index method show that the results of the single factor index analysis are not much different,and the heavy metal elements are mainly Cu and Cd.From the comprehensive level of soil heavy metal elements,the study area is dominated by mild pollution and moderate pollution,and the soil condition is not very optimistic.4.The comprehensive evaluation of soil quality: owing to the pollution of heavy metal Cd and Cu elements and the lack of K element content,the comprehensive quality of the soil environment in the study area is poor.The proportion of soil in the third(medium),fourth(poor,etc.)and fifth(inferior)areas of the study area was 99.4%,and the soil quality was not expectant.