Distribution characteristics, migration transformation and influencing factors of Ge in soil-rice system in Shuangyang River Basin, Heilongjiang Province
Liang Shuai1,2,3(), Dai Hui-Min1,2,3(), Zhao Jun4, Liu Guo-Dong1,2,3, Liu Kai1,2,3, Zhai Fu-Rong5, Han Xiao-Meng1,2,3, Wei Ming-Hui1,2,3, Zhang Zhe-Huan1,2,3
1. Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034 2. Key Laboratory of Black Soil Evolution and Ecological Effects, Ministry of Natural Resources, Shenyang 110034 3. Key Laboratory of Black Soil Evolution and Ecological Effects, Liaoning Province, Shenyang 110034 4. Xi’an Geological Survey Center, China Geological Survey, Xi’an 110034 5. Liaoning Institute of Geology and Mineral Resources Co., Ltd., Shenyang 110034
Soil germanium natural endowment, genesis sources, ecological and environmental effects and human health assessment are important research directions in the ecological geology of black soil, and the quantitative study of germanium distribution characteristics, migration transformation and influencing factors in the soil-rice human system is of great significance to the development of germanium-rich agricultural products and human health in black soil areas. Based on the 1∶50,000 ecogeochemical survey of land quality in the Shuangyang River Basin, we obtained germanium and other elemental data from multi-media such as soil-forming parent material, top soil, rice seeds, root soil and human hair, and used GIS and SPSS software to statistically analyze the data. The results showed that the germanium content of the top soil ranged from 0.996×10-6 to 1.626×10-6, with an average value of 1.326×10-6, and the high value areas were mainly distributed in the northwest and central south of the north side of Shuangyang River; 70.55 km2 and 166.9 km2 of germanium-rich and germanium-sufficient arable land were delineated, which had a greater potential for developing green germanium-rich and selenium-rich agricultural products. Soil-forming parent material is the main factor affecting the germanium content of topsoil, and soil type and land use type have less influence; soil environment with acidic and organic matter deficiency may be more favorable for germanium enrichment. The germanium content of rice seeds ranged from 0.24×10-6 to 3.40×10-6, with a mean value of 1.59×10-6, and the samples meeting the moderate and strong uptake criteria accounted for 40% and 60%, respectively, and were at significantly germanium-rich levels. The germanium uptake coefficient (Ax)was significantly negatively correlated with the root soil germanium content (p=-0.34*), indicating that low concentrations of soil germanium have a promoting effect on rice growth and development, and high concentrations of germanium have an inhibitory or toxic effect on rice growth; it was positively correlated with the root soil pH (p=0.40), indicating that the migration and transformation ability of rice to germanium elements gradually increases with the increase of soil pH. Adult hair germanium levels were at normal healthy levels, but germanium levels in immature female hair significantly exceeded the reference range, and more detailed studies are needed for human health assessment.
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Liang Shuai, Dai Hui-Min, Zhao Jun, Liu Guo-Dong, Liu Kai, Zhai Fu-Rong, Han Xiao-Meng, Wei Ming-Hui, Zhang Zhe-Huan. Distribution characteristics, migration transformation and influencing factors of Ge in soil-rice system in Shuangyang River Basin, Heilongjiang Province. Geophysical and Geochemical Exploration, 2022, 46(6): 1555-1564.
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