地学前缘 ›› 2008, Vol. 15 ›› Issue (5): 36-46.

• 论文 • 上一篇    下一篇

成都平原区水稻土成土剖面Cd形态分布特征及影响因素研究

  

  1. 中国地质大学(北京) 地球科学与资源学院,北京 100083

  • 出版日期:2008-05-02 发布日期:2008-05-02
  • 作者简介:侯青叶(1978—),女,副教授,地球化学专业,环境地球化学和生态地球化学研究方向。E mail:qingyehou@126.com
  • 基金资助:

    中国地质调查局国土资源调查项目(GZTR20060201,GZTR20070201,GZTR0201)

Study of  distribution of geochemical speciation of cadmium and factors controlling the distribution in paddy soil profiles, Chengdu Plain, Southwest China.

  1. School of Earth Sciences and　Resources, China University of Geosciences(Beijing), Beijing 100083, China

  • Online:2008-05-02 Published:2008-05-02

PDF (PC)

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摘要：

成土过程中不同形态镉(Cd)迁移转化的影响因素研究对于了解Cd的地球化学行为具有非常重要的意

义。以四川省成都平原区农田生态系统水稻土剖面中不同形态Cd分布特征为例,探讨成土过程中不同形态

Cd的迁移转化影响因素及其生态危害性。结果表明:总量Cd、离子交换态Cd和碳酸盐Cd均表现出表层富集,

深层含量稳定的特征;岷江流域和沱江流域水稻土Cd含量的背景值分别为0147,0215 mg·kg-1。外源

输入耕层土壤中Cd主要为活动态,其增加量占Cd总量增加量的6071％～9052％,向下垂向迁移能力非常

弱。成土过程随着土壤中Cd总量增加,稳定态Cd含量显著增加,而活动态Cd含量明显降低。土壤的pH值主要

对碳酸盐态Cd含量有影响,pH值越大,其含量越高;随着土壤成熟度增高,粉粒和粘粒含量增加的同时,残渣

态Cd含量显著降低,而有机结合态Cd含量显著增高。耕层土壤中Cd的生物有效性系数高达059～065,已

经严重地影响到农作物安全。

关键词: 农田生态系统;不同形态镉;成土过程;水稻土;成都平原区

Abstract:

For understanding geochemical behaviors of cadmium (Cd), it is essential to study

the factors that affect the transport of different geochemical species of cadmium in the

pedogenetic process. We focus on the distribution features of cadmium species in paddy soil

profiles in Chengdu agroecosystems in Sichuan Province, in order to discuss the factors

controlling geochemical behaviors of cadmium species, and to assess the ecological safety.

It is known that Cd background values of paddy soils in Minjiang River and Tuojiang River

catchments are 0147 mg·kg-1 and 0215 mg·kg-1, respectively. The inputs of Cd Ion

exchange species and Cd carbonate species into cultivated soils dominate the total Cd

increments, and these cadmium species have limited ability to transfer along the profiles.

The total Cd, pH, total organic carbon (TOC) and clay minerals contents have significant

influence on the transferring of Cd species. The bioavailability index of cadmium for

cultivated paddy soil is very high; it ranges between 059 and 065, which suggests that

the cultivated soils have posed high risk on plant safety.

Key words:

Key words: agroecosystem; cadmium; pedogenetic process; paddy soil profiles

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