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0.1M KNO_3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。
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 KNO_3, 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.
出处
《应用生态学报》
CAS
CSCD
1990年第4期338-343,共6页
Chinese Journal of Applied Ecology
基金
国家自然科学基金
关键词
重金属
根际
化学行为
解吸
Desoiption, Rhizosphere effect, Ea ily desorped Cu, Difficultly desorped Cu, Desorption percentage.
