Li Xia, Wei Xiao-Feng, Wu Jin, Yin Zhi-Qiang, Wan Li-Qin, Sun Hou-Yun, An Yong-Long
College of Water Sciences, Beijing Normal University, Beijing, 100875 China.
China Institute of Geo-Environment Monitoring, Beijing, 100081 China.
J Mt Sci. 2022;19(5):1245-1262. doi: 10.1007/s11629-021-7015-9. Epub 2022 May 14.
Geochemical differentiation of soils has a series of consequences on plant and places pressure on the ecological environment. The quantitative evaluation of element migration in the Earth's critical zone is a challenging task. In this study, two demonstration study areas of Georgi were selected, and multiple chemical weathering indexes, chemical loss fraction, mass migration coefficients and biological enrichment coefficient method were used to assess the ecological and geochemical suitability. The results show that for the element of Fe, Zn, Se, Cu, Co, Ni, Mo and Ge, the degree of weathering and soil maturation, were greater in the rhyolitic tuff area than in the Plagioclase gneiss area. In both research sites, the heavy metal level of samples in Georgi did not exceed the standard limits. The plagioclase gneiss region's surface soil environment was more alkaline, and the content of soil organic matter was lower, resulting in a higher bioenrichment intensity of Ge, Co, Cu, and Se elements in Georgi than in the rhyolite-tuff area. The elements of Cd, Nb, Mo, Pb and As are considerably enriched in the soil of the plagioclase gneiss area but lost by leaching in the soil of the rhyolite tuff area, which is connected to the interplay of elemental abundance and human impact in the parent materials. This study provides a good example of how to assess growth suitability of Chinese medicinal materials in the Earth's critical zone.
土壤的地球化学分异对植物产生了一系列影响，并给生态环境带来压力。对地球关键带中元素迁移进行定量评估是一项具有挑战性的任务。本研究选取了格鲁吉亚的两个示范研究区域，采用多种化学风化指数、化学损失分数、质量迁移系数和生物富集系数法来评估生态和地球化学适宜性。结果表明，对于铁、锌、硒、铜、钴、镍、钼和锗元素，流纹质凝灰岩区域的风化程度和土壤成熟度高于斜长片麻岩区域。在两个研究地点，格鲁吉亚样品的重金属含量均未超过标准限值。斜长片麻岩区域的表层土壤环境碱性更强，土壤有机质含量更低，导致格鲁吉亚地区锗、钴、铜和硒元素的生物富集强度高于流纹质凝灰岩区域。镉、铌、钼、铅和砷元素在斜长片麻岩区域的土壤中显著富集，但在流纹质凝灰岩区域的土壤中因淋溶而流失，这与母质中元素丰度和人类影响的相互作用有关。本研究为评估地球关键带中中药材生长适宜性提供了一个很好的范例。
