Characteristics and influencing factors of soil se content in cultivated land in Longshan County,Hunan Province
Se is one of the essential micronutrients for human body and animals.326 surface soil samples were systematically collected in the cultivated area of Longshan County for analysis and testing.The spatial distribution characteristics,spatial variation characteristics,vertical distribution characteristics and influencing factors of soil Se content in the region were studied,and the influencing factors of soil available Se were analyzed.The results showed that the average content of Se in the study area was 0.33 mg·kg-1,and the average content of soil organic matter was 20.7 g·kg-1.The soil was acidic.The soil of Se content showed medium spatial variation,and the vertical distribution showed the law of surface enrichment.Se content is mainly affected by soil forming parent material and land use in the study area,and there is a significant positive correlation between organic matter content and Se content(P＜0.01).The forms of soil Se are mainly humic acid bound and strong organic bound,and the effective Se components account for a relatively low proportion.The bioavailability of soil Se is greatly affected by the total amount of Se and pH.the soil pH can be adjusted artificially to improve the bioavailability of Se,effectively improve the value of land use.
topsoilSespatial distributioninfluencing factorsLongshanHunan Province
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