重金属在根际中的化学行为——Ⅱ.土壤中吸附态铜解吸的根际效应

应用生态学报 ›› 1990, Vol. 1 ›› Issue (4): 338-343.

重金属在根际中的化学行为——Ⅱ.土壤中吸附态铜解吸的根际效应

王建林, 刘芷宇

中国科学院南京土壤研究所, 南京 210008

收稿日期:1990-02-23 出版日期:1990-10-25 发布日期:1990-10-25
基金资助:
国家自然科学基金资助课题

Chemical behavior of heavy metals in rhizosphere Ⅱ. The rhizosphere effect of desorption of adsorbed Cu in soils

Wang Jianlin, Liu Zhiyu

Institute of Soil Science, Academia Sinica, Nanjing 210008

Received:1990-02-23 Online:1990-10-25 Published:1990-10-25

摘要/Abstract

摘要： 用第四纪红壤性水稻土(QP)、淀浆白土(WP)、第四纪红土(QR)和赤红壤(LR)研究了土壤中吸附态铜的解吸的根际效应。结果表明,吸附态铜可分为0.1MKNO₃解吸的易解吸态铜和0.1MHCl解吸的难解吸态铜。随吸附量增加,易解吸态铜百分数增加,而难解吸态铜百分数下降。易解吸态铜在根际土中的量小于非根际土中的量,各土壤的根际效应依次为:QP>WP>LR>QR;其平均解吸百分数则为:QR>LR>WP>QP。难解吸态铜的量为根际土大于非根际土,各土壤的根际效应为:WP>LR>QP>QR,其平均解吸百分数依次为QP>WP>LR>QR。根际中铜吸附的增加主要是因为难解吸态铜的增加。

关键词: 解吸, 根际效应, 易解吸态铜, 难解吸态铜, 解吸百分数

Abstract: In this paper,the rhizosphere effect of desorption of adsorbed Cu previously in the Quaternary reddic paddy soil (QP),Lateritic red soil(LR),Quaternary red earth (QR) and White bleaching paddy soil(WP) were investigated. The results showed that the adsorbed Cu could be divided into the easily desorped Cu (Cuedes),which could be desorped by 0.1M KNO₃,and the difficultly desorped Cu (Cuddes),which would be desorped by 0.1M HCl. As the adsorption of Cu increased,the desorption percentage of Cuedes increased,while that of Cuddes decreased. For Cuedes,it was less in rhizosphere soil than in bulk soil,the rhizosphere effect of samples was shown as QP>WP>LR>QR,and the mean desorption percentage of easily desorped Cu were in the order of QP<WP<LR<QR. For Cuddes,it was much in the rhizosphere soil,the rhizosphere effect was shown as WP>LR>QP>QR,and the mean desorption percentage of difficultly desorped Cu were in the order of QP>WP>LR>QR. The total desorption percentage of samples were QP>WP>QR>LR. The increase of Cu adsorption in rhizosphere was mainly attributed to the increase of difficultly desorped Cu.

Key words: Desoiption, Rhizosphere effect, Ea ily desorped Cu, Difficultly desorped Cu, Desorption percentage

王建林, 刘芷宇. 重金属在根际中的化学行为——Ⅱ.土壤中吸附态铜解吸的根际效应[J]. 应用生态学报, 1990, 1(4): 338-343.

Wang Jianlin, Liu Zhiyu. Chemical behavior of heavy metals in rhizosphere Ⅱ. The rhizosphere effect of desorption of adsorbed Cu in soils[J]. Chinese Journal of Applied Ecology, 1990, 1(4): 338-343.

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