ZHANG Li1,2, YANG Chenmeng3, SUN Guangyi3, MAO Long2, LIU Lifen2, CUI Yujun2
（1.Key Laboratory for Evolution and Ecological Effect in Black Soil, Shenyang 110034, China;
2.Heilongjiang Institute of Natural Resources Survey, Key Laboratory of Black Soil and Water Resources Research of Heilongjiang Province, Harbin 150036, China;
3.Institute of Geochemistry Chinese Academy of Sciences, State Key Laboratory of Environmental Geochemistry, Guiyang 550081, China;）
Abstract: The selenium content and influencing factors of staple crops in Suihua area of Songnen Plain were investigated by analyzing the physical and chemical properties of soil, the content of soil total selenium, available selenium, selenium speciation, and crop selenium. Correlation analysis and multiple linear regression analysis were used to explore the main factors affecting soil selenium content and crop selenium content. The results indicated that the content of selenium in crops ranged from 0.002 to 0.096 mg/kg, the content of total selenium in soil ranged from 0.13 to 0.52 mg/kg, and the content of available selenium in soil ranged from 0.002 to 0.007 mg/kg, strong organic selenium is the main form of soil selenium (31.52%). Correlation analysis showed that soil total selenium had a high correlation with organic matter, but a low correlation with available selenium and redox potential (Eh); soil available selenium was significantly positively correlated with pH; selenium content in crops had different degrees of correlation with soil ion-exchangeable selenium, available selenium, pH, Eh and organic matter. The enrichment mechanism of selenium in different crops was different. The enrichment ability of selenium in rice was significantly stronger than that in maize. The results showed that the Se content in soil could be better absorbed by crops through the artificially controlled soil characteristics, so that the Se content in crops could meet the health needs of residents. At the same time, the study provides a possible way to solve the natural "selenium deficiency" caused by geological background factors.
Key word: Northeast China; crop production base; soil selenium; correlativity; influencing factors
EARTH AND ENVIRONMENT Vol.49, No.5, Tot No.343, 2021, Page 510-519