| 外源铜锌在我国典型土壤中的老化特征 |
| 徐明岗
; 王宝奇
; 周世伟
; 李淑芹
; 陈苗苗
; 段改莲
|
| 发表期刊 | 环境科学
 |
| ISSN | 0250-3301
|
| 2007-12-31
|
| 卷号 | 29期号:11 页码:3213-3218 |
| 关键词 | 老化
铜
锌
有效性
红壤
褐土
|
| 产权排序 | 中国农业科学院农业资源与农业区划研究所农业部植物营养与养分循环重点开放实验室;东北农业大学资源与环境学院;中国科学院烟台海岸带可持续发展研究所;北京市昌平区土肥站 |
| 通讯作者 | 徐明岗
|
| 作者部门 | 生物资源实验室
|
| 英文摘要 | 采用室内培养的方法,研究了我国3种典型土壤——红壤、水稻土和褐土,在铜、锌单一污染和复合污染下的老化过程.结果表明,有效态铜、锌(0.01 mol.L-1CaCl2提取的金属)随时间先是快速下降,然后缓慢降低,大约90 d是转折点.无论是在单一污染还是在复合污染土壤中,铜和锌的老化都没有显著差异,预示着这2个金属有相似的化学行为.铜、锌在红壤、水稻土和褐土中的老化最适合二级动力学方程(R2为0.9940~0.9999,p<0.0001),而抛物线扩散方程拟合程度较差,说明金属有效形态向无效形态的转化过程(老化)并不完全取决于扩散作用,它是表面聚合/沉淀作用、有机质包裹作用、扩散作用等交互的结果.铜锌在土壤中的老化显著受pH影响,在低pH土壤(红壤),金属有效形态比例高,老化速率慢,速率常数k2为4.36×10-3~7.05×10-3kg.(mg.d)-1;高pH土壤(褐土)中,金属有效形态比例低,老化速率快,k2为1.095×10-2~1.377×10-2kg.(mg.d)-1.也就是说,随土壤pH升高,金属的老化速率加快. |
| 中文摘要 | The aging processes of copper and zinc in single and combined metal-contaminated typical soils of China,red soil,paddy soil and cinnamon soil,were studied.The results showed that available copper and zinc(metals extracted by 0.01(mol·L)-1 CaCl2) decreased rapidly at initial stages,and then reduced slowly,where the turning point occurred at about 90 d.The difference in aging of copper and zinc was insignificant whether in single metal-contaminated soils or in combined metal-contaminated soils,suggested there were similar chemical behaviors between copper and zinc.The aging processes of copper and zinc in red soil,paddy soil and cinnamon soil fitted best a second-order equation(R2=(0.994?0)-(0.999?9),p<(0.000?1)),whereas parabolic diffusion equation has less goodness of fit. It indicated that the transformation from availability to unavailability of metals,i.e.aging,was not completely controlled by diffusion,but controlled by the interactions from surface nucleation/precipitation,occlusion by organic matter,and diffusion,etc.The aging of copper and zinc in soils was significantly affected by pH.In soils with low pH such as red soil,the ratio of available metals was higher and the aging rate was slower [constant of rate,k2 4.36×10-3-7.05×10-3(kg·(mg·d))-1];whereas in soils with high pH,for example in cinnamon soil,the ratio of available metals was lower and the aging rate was faster [k2 1.095×10-2-1.377×10-2(kg·(mg·d))-1].That is,the aging rate of metals in soils increased obviously with increasing pH. |
| 资助机构 | 国家重点基础研究发展规划(973)项目(2002CB410809)
|
| 收录类别 | CSCD
|
| 语种 | 中文
|
| CSCD记录号 | CSCD:3458955
|
| 引用统计 |
|
| 文献类型 | 期刊论文
|
| 条目标识符 | http://ir.yic.ac.cn/handle/133337/4137
|
| 专题 | 海岸带生物学与生物资源利用重点实验室_海岸带生物学与生物资源保护实验室
|
推荐引用方式
GB/T 7714 |
徐明岗,王宝奇,周世伟,等. 外源铜锌在我国典型土壤中的老化特征[J]. 环境科学 ,2007,29(11 ):3213-3218.
|
| APA |
徐明岗,王宝奇,周世伟,李淑芹,陈苗苗,&段改莲.(2007).外源铜锌在我国典型土壤中的老化特征.环境科学 ,29(11 ),3213-3218.
|
| MLA |
徐明岗,et al."外源铜锌在我国典型土壤中的老化特征".环境科学 29.11 (2007):3213-3218.
|
修改评论