Migration Characteristics and Influencing Factors of Se in Soil-Plant System in Tianshan Northern Slope Economic Zone
According to explore the migration and enrichment patterns of Se between soil and plants,based on the col-lection of existing relevant data,a typical selenium rich area on the northern slope of the Tianshan Mountains in Xinjiang was selected.Plant samples and root soil samples were collected in a targeted manner,and the content of Se,Se forms,and other related elements in plant Se and root soil were analyzed.The enrichment coefficients of Se in edible parts of different plants and their correlations with various elements in the soil were evaluated.The results showed that:1)The Se content in the soil of the study area ranged from 0.09 to 4.25 mg/kg,with a background value of 0.21 mg/kg;Se is sig-nificantly positively correlated with elements such as Corg and N;2)Strong organic matter bound selenium(SOM Se),weak organic bound selenium(Hab Se),and residual selenium(Re Se)are the main forms of selenium in soil,accounting for 91.8％of the total Se content in soil;The Se content in swamp soil,irrigated silt soil,and paddy soil is significantly higher than that in other types of soil;3)The absorption capacity of plants for Se varies greatly,with wheat and com hav-ing the strongest Se enrichment effect and the best selenium production per unit mass;4)The Se in com and chives main-ly exists in the form of selenomethionine(SeMet),accounting for 71％and 55％of Se in chives and com,respectively,which is easily absorbed by the human body.Overall,Se in the soil of the study area mainly exists in the forms of strong-ly organic matter bound selenium(SOM-Se),weakly organic bound selenium(Hab Se),and residual selenium(Re Se),with the highest Se content in swamp soil,irrigated soil,and paddy soil;Wheat and com have the strongest Se enrich-ment effect and the best selenium production effect;The Se in corn and chives mainly exists in the form of selenomethio-nine(SeMet),which is easily absorbed by the human body.
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