Spatio-temporal distribution and influencing factors of selenium in soil-crop system from the plateau basin region, Northeastern Yunnan
CHEN Zi-wan1,2,3, XU Jing1,3, YANG Shu-yun1,3, HOU Zhao-lei1,3, YANG Fan4, ZHANG Fu-gui4, YU Lin-song2
1. Yunnan Institute of Geological Survey, Kunming 650216, China; 2. School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China; 3. Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650051, China; 4. Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Abstract：The temporal and spatial distribution of soil selenium (Se) and its influencing factors in a typical plateau basin area of northeastern Yunnan are investigated by studying the main objects including rocks, soil, and crops (apples). These objects were monitored using the analytical techniques of elemental speciation and bioconcentration coefficient. The result shows that the selenium-enriched soils were concentrated in the towns of Sayu and Jiupu, and selenium in soil was mainly inherited from carbonate rock, coal-bearing clay rock, basalt, and Quaternary sediments. Soils in carbonate rock and clay rock areas were affected simultaneously by supergene enrichment mechanisms, and soils from different parent material areas showed changes in the active proportion of selenium at different depths, especially at the depth of 20~60cm. The degree of selenium bioconcentration satisfied the relation: basalt > coal-bearing clastic rock > Quaternary sedimentary rock > carbonate rock. In the complex parent material section of the basin, Se demonstrated higher biological activity, and soil Se was more likely to accumulate in apple leaves, followed by roots, branches, and fruits. In addition, organic matter, pH, and soil parent material were the three key variables influencing selenium movement and accumulation in soil and crops, and soil Se tended to migrate into crops Particularly at pH 6.05~7.15. The temporal and spatial changes of soil Se in the area were primarily affected by differences in land cultivation methods and the mixing of unnatural sources, and the changes mostly occurred in the "high Se" and "low Se" regions. The appearance of unnatural Se sources was accompanied by the accumulation of other pollutants; therefore, it is recommended to strengthen source monitoring and pollutant risk assessment in these areas.
陈子万, 许晶, 杨树云, 侯召雷, 杨帆, 张富贵, 于林松. 滇东北高原盆地土壤—苹果作物系统硒时空分布及影响因素[J]. 中国环境科学, 2023, 43(2): 781-792.
CHEN Zi-wan, XU Jing, YANG Shu-yun, HOU Zhao-lei, YANG Fan, ZHANG Fu-gui, YU Lin-song. Spatio-temporal distribution and influencing factors of selenium in soil-crop system from the plateau basin region, Northeastern Yunnan. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 781-792.
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