The present study attempted to evaluate the influence of human activity on major elements （Na2O, MgO, A1203, SiO2, K2O, CaO, Fe203）, and to find a method to explore correlations between major elements and human dist...The present study attempted to evaluate the influence of human activity on major elements （Na2O, MgO, A1203, SiO2, K2O, CaO, Fe203）, and to find a method to explore correlations between major elements and human disturbances, according to geospatial theories and methods. The study results indicate that landscapes influence major elements in diverse ways： Al2O3 is closely related to road and mine landscapes; strong relationships exist between MgO, Fe2O3, CaO, and SiO2 and roads; Na2O, SiO2, and Fe2O3 are unrelated to city landscapes; and Na2O is unrelated to road and mine landscapes.展开更多
Urbanization, particularly the transformation of agricultural land into urban areas, significantly impacts soil quality, especially concerning the concentration and distribution of heavy metals. This study investigate...Urbanization, particularly the transformation of agricultural land into urban areas, significantly impacts soil quality, especially concerning the concentration and distribution of heavy metals. This study investigates the spatial distribution of six heavy metals (As, Cd, Cr, Pb, Ni, and Zn) in soils at the urban-rural interface of Chengdu, focusing on areas transitioning from agricultural land to urbanized land and back to agricultural land. The study analyzes the three-dimensional spatial distribution of heavy metals and assesses the impact of urbanization on soil contamination. It was found that the top 1-m soil layer exhibited higher concentrations of heavy metals compared to the bedrock and deeper soil layers. A combination of geochemical assessments, including the Ratio of Secondary Phase to Primary Phase (RSP) and the Risk Assessment Code (RAC), was used to evaluate the ecological risks posed by these metals. The findings indicate that Cd is the most hazardous contaminant, with contamination levels being particularly high in older urban areas (N2, Shuangliu) and at river confluences (N6, Huayang). Soils in the old urban area not only had a higher total amount of heavy metals but also had a higher proportion of its heavy metal exchangeable form. These areas face significant ecological risks, and the study suggests that targeted soil remediation strategies should be developed, with a focus on urban soil reclamation and risk mitigation.展开更多
基金supported by the Youth Science Foundation (Grant Nos. 41101174 and 41301094)the Lead Strategic Project of the Chinese Academy of Sciences (Grant No. XDB03030507)+1 种基金the Hundred Young Talents Program of the Institute of Mountain Hazards and Environment (Grant No. SDSQB-2015-02)the Open Fund for Key Laboratory of Geoscience Spatial Information Technology of Ministry of Land and Resources (Grant No. KLGSIT2016-01)
文摘The present study attempted to evaluate the influence of human activity on major elements （Na2O, MgO, A1203, SiO2, K2O, CaO, Fe203）, and to find a method to explore correlations between major elements and human disturbances, according to geospatial theories and methods. The study results indicate that landscapes influence major elements in diverse ways： Al2O3 is closely related to road and mine landscapes; strong relationships exist between MgO, Fe2O3, CaO, and SiO2 and roads; Na2O, SiO2, and Fe2O3 are unrelated to city landscapes; and Na2O is unrelated to road and mine landscapes.
基金supported by the Science and Technology Department of Sichuan Province,China(2018JY0033)the Department of Natural Resources of Sichuan Province,China(KJe2019e3)the Luzhou Bureau of Science,Technology and Human Resources,China(2023JYJ075 and 2024JYJ072).
文摘Urbanization, particularly the transformation of agricultural land into urban areas, significantly impacts soil quality, especially concerning the concentration and distribution of heavy metals. This study investigates the spatial distribution of six heavy metals (As, Cd, Cr, Pb, Ni, and Zn) in soils at the urban-rural interface of Chengdu, focusing on areas transitioning from agricultural land to urbanized land and back to agricultural land. The study analyzes the three-dimensional spatial distribution of heavy metals and assesses the impact of urbanization on soil contamination. It was found that the top 1-m soil layer exhibited higher concentrations of heavy metals compared to the bedrock and deeper soil layers. A combination of geochemical assessments, including the Ratio of Secondary Phase to Primary Phase (RSP) and the Risk Assessment Code (RAC), was used to evaluate the ecological risks posed by these metals. The findings indicate that Cd is the most hazardous contaminant, with contamination levels being particularly high in older urban areas (N2, Shuangliu) and at river confluences (N6, Huayang). Soils in the old urban area not only had a higher total amount of heavy metals but also had a higher proportion of its heavy metal exchangeable form. These areas face significant ecological risks, and the study suggests that targeted soil remediation strategies should be developed, with a focus on urban soil reclamation and risk mitigation.
