| 紫色土外源砷的形态分配与化学、生物有效性 |
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| 引用本文： | 苗金燕,何峰,魏世强,刘刚.紫色土外源砷的形态分配与化学、生物有效性[J].应用生态学报,2005,16(5):899-902. |
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| 作者姓名： | 苗金燕 何峰 魏世强 刘刚 |
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| 作者单位： | 1. 重庆交通学院, 重庆 400074;2. 重庆南岸茶园博士后科研工作站, 重庆 401336;3. 西南农业大学资源环境学院, 重庆 400716 |
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| 基金项目： | 重庆市科委科技攻关资助项目(20016655). |
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| 摘 要： | 采用盆栽试验与化学分析相结合的方法研究了外源As在酸性、中性、钙质紫色土中的形态分配及其化学、生物有效性特征.结果表明,土壤本底As68%～86%为残留态,外源As加入10d后50.2%～61.1%转化为残留态,至收获期(60d)仅增1%～2%.酸性紫色土中活性态As分配为:A(交换态)As>Al As>Fe As>Ca As;中性紫色土:A As>Al As>Ca As>Fe As;石灰性紫色土:A As>Ca As>Al As>Fe As.浸提剂HCl、NaHCO3、NH4Cl对土壤As的提取能力不同,与植物吸收As的相关性也有差异.NH4Cl主要提取交换态As,对土壤As的原有形态影响最小,与植株吸收量呈极显著相关,可作为不同土壤有效As的通用浸提剂.多元回归表明,酸性紫色土决定植株吸As量的是Al As和Fe As,中性、石灰性紫色土为A As和Ca As.试验发现,Al As分级时存在F-的干扰,1mol·L-1H3BO3可有效掩蔽.
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| 关 键 词： | 紫色土 砷 形态 有效性 |
| 文章编号： | 1001-9332(2005)05-0899-04 |
| 收稿时间： | 2003-09-04 |
| 修稿时间： | 2003年9月4日 |
Forms and bio-availabilities of exogenous arsenic in purple soils |
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| MIAO Jinyan,HE Feng,Wei Shiqiang,LIU Gang.Forms and bio-availabilities of exogenous arsenic in purple soils[J].Chinese Journal of Applied Ecology,2005,16(5):899-902. |
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| Authors: | MIAO Jinyan HE Feng Wei Shiqiang LIU Gang |
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| Affiliation: | 1. Chongqing Jiaotong University, Chongqing 400074, China;2. Chayuan Postdoctoral Center of Scientific and Research, Chongqing Nan′an 401336, China;3. College of Resources and Environment Science, Southwest Agriculture University, Chongqing 400716, China |
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| Abstract: | This study showed that after As was added into purple soils for 10 days, 50.2%-61.1% of it transformed into residual As, occupying 68%-86% in original soils. For acid purple soil, the As forms were Al-As > Fe-As> Ca-As; for neutral purple soil, they were Ca-As > Al-As > Ca-As > Fe-As > A-As, and for calcic purple soil, they were Ca-As > Al-As > Fe-As >A-As. It is suggested that NH4Cl could be used as common extractant for different soils, because it slightly affected original As forms in soils, and showed a highly significant correlation (P = 0.01) to plant absorption. From pluralistic regressive analysis of plant As content and each As form, Al-As and Fe-As were the main available forms in acid purple soil, but A-As and Ca-As were the most important fractions in neutral and calcic purple soils. The study also showed that H3BO3 could restrain the F interference in the operation of As speciation separations. |
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| Keywords: | Purple Soil Arsenic Form Availability |
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