成都平原土壤中Cd的空间分布与第四纪单元响应分析

A study of the spatial distribution and genesis of Cd in soil of Chengdu plain

通过样品采集和室内分析,研究了成都平原区土壤中Cd高含量区的区域分布特征和第四纪分布的空间响应关联。在绵远河、石亭江流域冲积物中存在Cd含量高值区。在同一流域Ⅰ、Ⅱ级阶地→Ⅲ级阶地→Ⅳ级或Ⅴ级阶地冲积物中Cd含量逐渐降低。发育于龙门山的河流(绵远河、石亭江)沉积物Cd含量显著高于其他水系沉积物。Cd高含量分布区与不同级次的阶地相吻合的特征表明其控制因素显著,属于地质作用的产物。这一结论与多数研究者认为的人为因素引起的具有根本区别。

Based on sample collection and laboratory analysis, this paper studied the distribution features and genesis of Cd in soil of high content areas in Chengdu plain 13ing in the alluvium of Mianyuan River and Shiting River basin. The high content areas of Cd are distributed in alluvium of Terrace 1 and 2, and gradually decrease from Terrace 3 to Terrace 5. The content of Cd in alluvium along the two rivers developed in the Longmeng Mountain is remarkably higher than that of other water systems. The feature that the high content areas of Cd are consistent with different terraces indicate evidently that the evolution of geological processes served as a controlling factor. This conclusion is radically different from the opinion of most investigators that it resulted from human factors.