摘要
区域Cd地球化学异常成因机理及其生态效应研究是目前多目标地球化学调查工作中的一个热点问题,但是许多问题仍不明确。本次研究结果表明,区域Cd地球化学异常由自然地质作用形成,主要受土壤机械(粒级)组成的控制,Cd的累积过程遵循吸附沉淀机理,由此决定了土壤中Cd的活性组分含量比较高,并导致部分异常区某些作物中Cd的含量超标。进一步研究发现,Cd异常的生态效应还具有区域分异特征,并因土地耕作方式不同而异,这一发现为农作物合理布局提供了依据。
The study of the origin and ecological effect of regional Cd geochemical anomalies are a hot topic in multi-target geochemical survey now. But many problems are still unclear. This study indicates that regional Cd geochemical anomalies are formed by natural geological processes and are mainly controlled by the mechanical composition or grain sizes of soils. The cumulative process of Cd follows the mechanics of adsorption and deposition, thus determining the relatively high content of the Cd active component in soils and resulting in the presence of the Cd content surpassing the state standards in some crops. Further study shows that the ecological effect of Cd anomalies differs from area to area and changes with the cultivation manner. This provides a basis for the rational layout of crop growth.
出处
《地质通报》
CAS
CSCD
北大核心
2004年第11期1083-1087,共5页
Geological Bulletin of China
基金
中国地质调查局地质调查项目(200214200034
200220130004)资助。
关键词
平原区
Cd地球化学异常
成因机理
生态效应
plain areas
Cd geochemical anomaly
genetic mechanism
ecological effect
