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当前位置: 首页 > 文章 > 土壤pH值对冻融黑土重金属Cd赋存形态的影响 农业环境科学学报 2008,27 (02) 176-180
Position: Home > Articles > Effects of pH on the Fraction Transformations of Cd in Phaiozem Soil at the Condition of Freeze/Thaw Cycles Journal of Agro-Environment Science 2008,27 (02) 176-180

土壤pH值对冻融黑土重金属Cd赋存形态的影响

作  者：
王洋;刘景双;王金达;王国平
单  位：
中国科学院东北地理与农业生态研究所
关键词：
重金属Cd;形态转化;pH值;冻融循环;黑土
摘  要：
冻融作用对不同土壤pH值的重金属Cd赋存形态的转化产生显著影响,以24h为一个冻融周期,对2.5mgCd·kg-1的黑土冻融8次的实验结果表明,pH值6.0～4.5时,冻融作用促进重金属交换态和有机结合态Cd含量增加,铁锰氧化物结合态和残渣态Cd含量降低;pH值6.0～9.5时,冻融作用促进交换态和有机结合态Cd含量降低,铁锰氧化物结合态和残渣态Cd含量增高。从重金属Cd赋存形态的转化可得,随着土壤pH值的升高,冻融作用促进重金属Cd生物有效态含量降低。
译  名：
Effects of pH on the Fraction Transformations of Cd in Phaiozem Soil at the Condition of Freeze/Thaw Cycles
作  者：
WANG Yang1,2,LIU Jing-shuang1,WANG Jin-da1,WANG Guo-ping1 (1.Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, China; 2.Graduate School, Chinese Academy of Sciences, Beijing 100049, China)
关键词：
heavy metal Cd; fraction transformations; pH value; freeze/thaw cycles; the phaiozem
摘  要：
Freeze/thaw process is one of the important environment factors which can cause the soil physical-chemical and biological properties change. The impacts of pH on the Cd fractions transformation in phaiozem soil at the condition of freeze/thaw cycles (FTCs) were investigated. The results indicate that FTCs can promote Cd fraction transformations at different soil pH. When the pH value is from 4.5 to 6.0, the FTCs promote the increase of exchangeable and organic matter binding fraction Cd and the decrease of iron-manganese oxides binding fraction and residual fraction Cd. Adversely when the pH value is from 6.0 to 9.5, the FTCs promote the decrease of exchangeable and organic matter binding fraction Cd and the increase of iron-manganese oxides binding fraction and residual fraction Cd. The results also indicate that FTCs can cause the decrease of available Cd content with the increase of soil pH.

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