Affiliation:
1. School of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
2. Key Laboratory of Agricultural Resource and Ecology in Poyang Lake Watershed of Ministry of Agriculture and Rural Affairs in China, Nanchang 330045, China
3. Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Nanchang 330045, China
4. Key Innovation Center for the Integration of Industry and Education on Comprehensive Utilization of Agricultural Wastes & Prevention and Control of Agricultural Non-Point Pollution of Jiangxi Province, Nanchang 330045, China
Abstract
As natural selenium (Se)-rich soil in China is generally characterized by a high geological background of cadmium (Cd), the safe utilization of such seleniferous soil remains a challenge. The accumulating evidence shows that the threshold value of the Se:Cd ratio is a determinant of regulating Cd accumulation in plants. However, the factors modulating the soil’s Se:Cd ratio in selenium-enriched regions are not well understood. Here, a comprehensive study aimed at quantitatively analyzing the effects of land-use types, parent-material types, and soil properties on the distribution and influencing factors of Se, Cd, and the Se:Cd ratios. According to land use and parent-material types, 77 soil samples were collected in Yuanzhou District, a typical naturally seleniferous area in the subtropical hilly area. The results suggested that, compared with quaternary red clays (qrc), the Se content of soils derived from river and lake sediments (rls) and weathered acidic crystalline rocks (wacr) decreased by 5.81%–19.75%, while the weathered quartzite (wq)-derived soils was increased significantly. The soil Cd content in an orchard was significantly reduced compared with that in a paddy field. A redundancy analysis (RDA) revealed that SOM, Total K, and Total P significantly affected the changes in Se and Cd contents. In addition, the land-use type had the most significant effect on the Se:Cd ratio, with a regression coefficient of −0.6999 analyzed by the binary logistic regression model (p < 0.05). Furthermore, pH and Total K were the critical soil properties in controlling the Se:Cd ratio. The study indicated that the Se:Cd ratio in natural selenium-rich soil was mainly regulated by land-use types. Therefore, it is a feasible measure to regulate the Se:Cd ratio by using agronomic practices, mainly regulating soil pH, for the safe utilization of selenium-rich soil with a high Cd background.
Funder
the Special Key Grant Project of Technology Research and Development of Jiangxi Province
National Natural Science Foundation of China
Youth Foundation of Jiangxi Educational Committee
Project of Jiangxi Selenium-rich Agricultural Research Institute
Jiangxi Province Postgraduate Innovation Special Fund Project
Cited by
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