Environmental Quality Assessment And Pollution Accumulation Analysis Of Plantation Soil In Lingshui County

Soil is a kind of important natural resources and one of the essential environmental factors.Environmental quality of soil directly affects the safety and quality of agricultural products,which has a profound impact on human health through the food chain.With the frequent occurrence of domestic soil pollution problems in recent years,the issue of agricultural product safety has increasingly attracted attention and sustainable development faces serious challenges.This thesis takes the soil environment of tropical plantation as the research object,and conducts on-the-spot investigation,sample collection and analysis and soil environmental quality assessment in Lingshui Li Autonomous County of Hainan Province.On the basis of mastering the agricultural production conditions and the main planting types in Lingshui County,the typical planting types,medium and large-scale plantations,and 59 planting area,which were potentially polluted,were selected to conduct soil sampling were selected as research objects.From the three aspects of soil physical and chemical properties,inorganic pollutants and organic pollutants,detection analysis was conducted on the soil environmental quality and pollution characteristics,and a synthetical evaluation and classification of plantation soil environment in Lingshui County was conducted.Accumulated risk assessments are performed on over-scale locations and plantation areas.Lingshui County's tropical crop cultivation accounts for 34.26% of the total sown area.The main planting species include: rubber,coconut,betel nut,mango,lychee,banana,cherry fruit and so on.The pH of the soil is neutral and acidic.Soil organic matter concentrated in the range of 13.6 to 41.31cmol/kg.Soil cation exchange capacity concentrated in the range of 0.01 to 8.71 cmol/kg.The Lingshui tropical crop plantation is dominated by a mixture of chemical fertilizers and organic fertilizers.The average nitrogen content in the plantation soil is 85.73 mg/kg,the average phosphorus content is 36.49 mg/kg,and the average potassium content is 92.54 mg/kg.The detection and analysis indicated that the soil environmental quality in Lingshui was in good condition.Cadmium,arsenic,lead,mercury,nickel,and copper are relatively low in soil,and zinc content is high.The content of chromium in soil varies widely.There were no samples exceeding the standards for cadmium,arsenic,lead,mercury,chromium and copper.The zinc and nickel in the soil of one point sample exceeded the standard and the sample was derived from Pitaya plantation.Organic pollutants including benzopyrenes,DDT and 666 in soil samples were under the standard.As for the risk assessment of soil environmental accumulation,according to the cumulative risk assessment of individual pollutants in Lingshui plantation soil,the order of Ai values was cadmium> zinc> lead> arsenic> copper.The accumulation risk of mercury,chromium,nickel and benzopyrenes in the soil of Lingshui plantation is low.From the perspective of the accumulation of pollutants in plantation types,the cumulative risk points for rubber plantations,mango orchards,banana orchards,and Hami melon gardens are 33.33%,37.50%,33.33%,60.00%,and 33.33%.The type of plantation with a higher cumulative risk is a banana plantation.A promote accumulation analysis was conducted as the DTPA available state was assessed.Results showed that the main pollutants were cadmium,arsenic and copper.It is a more suitable modle to present the accumulation of heavy metals in soil while the available content was high.