近日，中国科学院地球化学研究所刘意章团队报道了西南喀斯特表层土壤岩性对镉分布及潜在风险的影响。相关论文于2026年5月26日发表在《地球化学学报》杂志上。

岩溶地区的土壤面临地质成因镉富集的威胁。然而，目前学界对影响岩溶土壤中镉空间分布及其潜在风险的因素仍知之甚少。

研究组聚焦于岩性对岩溶土壤中镉总含量及其对作物风险的影响。采集了中国西南典型岩溶区的环境样品并进行分析，系统比较了碳酸盐岩区和碎屑岩区样品中的镉含量。结果显示，碳酸盐岩的镉浓度（0.50 mg/kg）高于碎屑岩（0.14 mg/kg）。富镉区（0.3–1.5 mg/kg）主要分布在碳酸盐岩下伏区域，该区域土壤平均镉含量（0.87 mg/kg）是碎屑岩发育土壤（0.43 mg/kg）的两倍。

研究区土壤中镉的富集主要来源于地质成因，而灌溉水和大气沉降的输入贡献较小。尽管碳酸盐岩发育土壤的总镉含量更高，但碳酸盐岩区和碎屑岩区玉米中的镉浓度相当，而碳酸盐岩区水稻中的镉含量甚至更低。总体而言，岩性塑造了土壤中镉的空间分布，且土壤总镉含量与生态风险并非正相关。因此，在区域土壤管理中，除总镉含量外，还应考虑岩性差异。

附：英文原文

Title: Influence of lithology on cadmium distribution and potential risks in karst surface soils, southwestern China

Author: Wei, Shuangshuang, Yang, Chaogui, Li, Qingguang, Ning, Zengping, Liu, Yizhang

Issue&Volume: 2026-05-26

Abstract: Soils from karst regions are facing the threat of geogenic cadmium (Cd) enrichment. However, factors influencing the spatial distribution of Cd and its potential risks in karst soils remain poorly understood. This study focused on the effects of lithology on total Cd content in karst soils and its risks to crops. Environmental samples from a typical karst area in southwestern China were collected and analyzed, and Cd in samples from carbonate and clastic regions was systematically compared. The results showed that carbonate rocks exhibited higher Cd concentration (0.50 mg/kg) than the clastic rocks (0.14 mg/kg). The Cd-rich zones (0.3–1.5 mg/kg) are primarily distributed in areas underlain by carbonate rocks, where the mean Cd content (0.87 mg/kg) was twice that in soils developed from clastic rocks (0.43 mg/kg). Geogenic sources primarily contribute to Cd enrichment in the studied soils, whereas the inputs from irrigation water and atmospheric deposition were minor. Despite higher total Cd content in carbonate-derived soils, the Cd concentrations in maize from both carbonate and clastic regions were comparable, whereas Cd levels in rice from carbonate regions were lower. Collectively, lithology shapes the spatial distribution of Cd in soil, and total soil Cd content was not positively correlated with ecological risks. Therefore, in addition to total Cd content, lithological differences should also be taken into account in regional soil management.

DOI: 10.1007/s11631-026-00883-1

Source: https://link.springer.com/article/10.1007/s11631-026-00883-1