Spatial distribution and main drivers of soil selenium in Taihu Lake Basin, Southeast China

Han Zhang; Zhencheng Ouyang; Manchun Li; Boqing Wen; Sudan Zhuang; Xiaomin Zhao; Penghui Jiang

doi:10.1016/j.jhazmat.2023.133091

Spatial distribution and main drivers of soil selenium in Taihu Lake Basin, Southeast China

J Hazard Mater. 2024 Mar 5:465:133091. doi: 10.1016/j.jhazmat.2023.133091. Epub 2023 Nov 30.

Authors

Han Zhang¹, Zhencheng Ouyang², Manchun Li³, Boqing Wen⁴, Sudan Zhuang⁴, Xiaomin Zhao⁵, Penghui Jiang⁶

Affiliations

¹ School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China; Key Laboratory of Coastal Zone Exploitation and Protection, Ministry of Natural Resources, Nanjing 210023, China; Collaborative Innovation Center of South China Sea Studies, Nanjing University, Nanjing 210023, China; Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China.
² Ganzhou Institute of Agricultural Sciences, Gannan Academy of Sciences, Ganzhou 341000, China.
³ School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China; Key Laboratory of Coastal Zone Exploitation and Protection, Ministry of Natural Resources, Nanjing 210023, China; Collaborative Innovation Center of South China Sea Studies, Nanjing University, Nanjing 210023, China; Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China. Electronic address: limanchun@nju.edu.cn.
⁴ School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China; Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China.
⁵ Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology of Ministry of Agriculture and Rural Affairs in China, Jiangxi Agricultural University, Nanchang 330045, China.
⁶ College of Public Administration, Nanjing Agricultural University, Nanjing 210095, China; Observation Research Station of Land Ecology and Land Use in the Yangtze River Delta, MNR, Nanjing 210017, China; China Resources & Environment and Development Academy (REDA), Nanjing Agricultural University, Nanjing 210095, China. Electronic address: jiangph@njau.edu.cn.

PMID: 38056274
DOI: 10.1016/j.jhazmat.2023.133091

Abstract

Selenium (Se) is an essential micronutrient that is both hazardous and beneficial to living organisms. However, few studies have examined soil Se distribution and its driving mechanisms on a large basin scale. Thus, multivariate statistics, geostatistics, boosted regression trees, and structural equation models were used to investigate the spatial distribution, driving factors, and multivariate interactions of soil Se based on 1753 topsoil samples (0-20 cm) from the Taihu Lake Basin. The results indicated that the soil Se concentration ranged from 0.12 to 57.26 mg kg^-1, with a mean value of 0.90 mg kg^-1. Overall, the spatial pattern of soil Se gradually decreased from south to north with approximately 1.06% of the soil contaminated with Se. Moisture index (MI), soil moisture (SM), and ≥ 0 ℃ accumulative temperature (AAT0) were the main determinants of soil Se accumulation. Additionally, the substantial effect of SM∩AAT0 on soil Se concentrations demonstrated that climate-soil interactions largely governed the spatial pattern of soil Se. The Se-enriched and Se-contaminated soils occurred mainly in regions with high precipitation, MI, SM, AAT0, and soil organic matter. This study provides a theoretical basis and practical guidance for the remediation of soil Se contamination and the sustainable development of Se-enriched agriculture.

Keywords: Boosted regression trees; Driving factors; Multivariate interactions; Soil selenium; Spatial distribution; Taihu Lake Basin.