期刊论文

中文

地质通报

1671-2552

2022

41

4

533-544

10.12097/j.issn.1671-2552.2022.04.002

国家自然科学基金项目《贵州岩溶区土壤剖面铀； 钍的富集机制及其环境活性研究》（批准号：41373115）； 湖南省自然科学基金项目《湘西岩溶区土壤剖面岩-土界面土层镉超常富集的地球化学机制》（批准号：2020JJ4524）；

本校为第一机构

通过对贵州岩溶区19条风化剖面Cd分布特征的研究,初步揭示了贫Cd碳酸盐岩发育的土壤中Cd的富集机制及Cd含量的约束因素。①贫Cd基岩发育的土壤同样可以导致Cd的明显富集,甚至超常富集,且含量峰值通常位于土壤层底部(T1)。②Cd在基岩中通常优先赋存在酸不溶相,另一方面,由于基岩酸不溶物含量一般极低,酸溶相的Cd占全岩Cd的比例仍处于绝对优势。在富Cd的基岩酸不溶物基础上,叠加了来自酸溶相中Cd的贡献,是岩溶区土壤Cd普遍富集的原因。③土壤中Cd的含量与其在基岩或基岩酸不溶物中的含量均不相关。T1中Cd的含量受制于Cd在基岩酸不溶物中的含量、基岩酸溶相Cd占全岩中Cd的质量百分数、T1中Cd的亏损...

Based on the study on the distribution characteristics of Cd for 19 weathering profiles in the karst areas of Guizhou, China, this work preliminarily revealed the enrichment mechanisms of Cd and the restrictive factors of Cd contents in soils developed on Cd-poor carbonate rocks. The main conclusions are as follows:① Soils derived from Cd-poor bedrocks can also contain obvious enrichment or even supernormal enrichment phenomenon of Cd, and the summit content of Cd is usually located at the bottom of the soil layer(i.e., T1).② Cd generally pre...