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应用生态学报 ›› 2002, Vol. ›› Issue (5): 555-558.

• 研究论文 • 上一篇    下一篇

紫色土外源锌、镉形态的生物有效性

朱波1, 青长乐2, 牟树森2   

  1. 1. 中国科学院成都山地灾害与环境研究所, 成都 610041;
    2. 西南农业大学资源环境学院, 重庆 500635
  • 收稿日期:1999-10-15 修回日期:2000-10-25
  • 通讯作者: 朱波,男,1966年生,博士,研究员,主要从事农业生态、土壤学和生物地球化学循环方面的研究,发表论文40多篇.E-mail:bzhu@imde.ac.cn
  • 基金资助:
    中国科学院知识创新工程资助项目(KZCX2413)

Bioavailability of exotic zinc and cadmium in purple soil

ZHU Bo1, QING Changle2, MU Shusen 2   

  1. 1. Institute of Mountain Hazards and Environment, Chinese Academy of Scienees, Chengdu 610041;
    2. College of Resource and Environment, Southwest Agricultural University, Chongqing 500635
  • Received:1999-10-15 Revised:2000-10-25

摘要: 通过对7种形态Zn、Cd与有效态Zn、Cd(DTPA提取)的相关分析及各形态Zn、Cd与植株Zn、Cd含量的通径分析,评价各形态Zn、Cd的生物有效性及对植株的相对贡献和途径.结果表明,交换态Zn、Cd与有效态Zn、Cd呈极显著正相关(r=0.954、0.953),交换态Zn、Cd与植株Zn、Cd含量的通径系数为1.267、1.168,交换态Zn、Cd有效性高,具有最大的生物活性,对植株Zn、Cd含量的贡献最大.其它形态如碳酸盐结合态锌、氧化锰结合态Zn、Cd通过交换态作用于植株的通径链系数(间接通径系数)分别为0.856、0.592、0.723,上述形态对植株Zn、Cd含量也有影响,具有一定的生物相对有效性,但通过交换态间接作用.交换态不仅自身具有最大的生物有效性,而且还作为其它形态Zn、Cd生物有效性的中介,为紫色土其它Zn、Cd库流向植株的主要通道.

关键词: 紫色土, Zn, Cd, 形态分配, 生物有效性, 通径分析, 封丘县, 农业景观, 景观异质性, 两栖类, 黄河下游地区

Abstract: Correlation analysis between seven forms and available amounts (extracted by DTPA) of Zn and Cd, and their path analysis from soil to lettuce ( Lactuca sativ L.)were conducted to evaluate bioavailability of zinc and cadmium and their contributions to the plant.The results showed that exchangeable Zn and Cd were significantly correlated to available Zn and Cd ( r=0.954 and 0.953) at significance level of 0.01,and path coefficients of exotic Zn and Cd to tissue Zn and Cd were 1.267 and 1.168 respectively,indicating the high bioavailability of exchangeable Zn and Cd in purple soil.Exotic Zn and Cd made the most contribution to the plant, while the path chain coefficients of CAB Zn, MnO Zn, and Cd to the plant by indirect action of exchangeable forms were 0.856,0.592,0.723,respectively,showing that they may make some other contributions to tissue Zn and Cd through exchangeable forms.Therefore, exchangeable Zn and Cd are not only highest available,but also are bioavailable bridges and main paths from purple soil to the plant

Key words: Purple soil, Zn, Cd, Form distribution, Bioavailability, Path analysis, agricultural landscape, landscape heterogeneity, Fengqiu Country, the lower reaches of the Yellow River., amphibians

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