| 洋河流域不同土地利用类型土壤硒(Se)分布及影响因素 |
| 摘要点击 2644 全文点击 1245 投稿时间：2014-06-12 修订日期：2014-08-14 |
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| 中文关键词 土地利用 微量元素 Se 分布 影响因素 |
| 英文关键词 land use trace element selenium distribution influencing factors |
| 作者 | 单位 | E-mail | | 商靖敏 | 天津师范大学城市与环境科学学院, 天津市水资源与水环境重点实验室, 天津 300387
中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | shangjingmin@126.com | | 罗维 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | luow@rcees.ac.cn | | 吴光红 | 天津师范大学城市与环境科学学院, 天津市水资源与水环境重点实验室, 天津 300387 | | | 徐兰 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | | | 高佳佳 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | | | 孔佩儒 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | | | 毕翔 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | | | 程志刚 | 中国地质大学水资源与环境学院, 北京 100083 | |
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| 中文摘要 |
| 基于洋河流域土地利用方式、海拔高度、土壤、植被类型等采集流域上下游171个代表性表层土壤(0~10 cm),系统地分析了土壤总硒(Se)含量、分布及影响因素. 结果表明,洋河流域土壤总Se含量(以干重(dw)计,下同)在0.02~3.24 mg·kg-1之间,几何平均值为0.30 mg·kg-1,高于北京平原(0.20 mg·kg-1)、河北平原(0.19 mg·kg-1)和全国平均值(0.29 mg·kg-1). 洋河流域少Se(0.13~0.18 mg·kg-1)土壤主要分布在怀安县、宣化县以及怀来县, 多数地区土壤处于足Se水平(0.18~0.45 mg·kg-1),除此之外,在万全县、兴和县、天镇县及阳高县分布有富Se(0.45~2.0 mg·kg-1)土壤. 不同土地利用类型中Se含量有所差异,Se平均含量由高到低分别为: 林地>城镇工矿用地>草地>农业用地,其中农业用地平均含量为0.28 mg·kg-1. 成土母质、土壤类型对洋河流域Se含量影响较小. 黏粒含量与洋河流域表层土壤中Se相关性最好. Se含量随海拔增高显著增加,随pH增加显著减小. TOC、Fe和Al含量也是影响土壤Se含量的重要因素. |
| 英文摘要 |
| Based on different land use types, altitudes, soil and vegetation types etc, 171 representative topsoils(0-10 cm) were collected within the Yanghe watershed, China for determining the total concentrations, spatial distribution and influencing factors of selenium(Se). The results showed that the total selenium concentrations in soils within the watershed ranged from 0.02 to 3.24 mg·kg-1 dry weight(dw). The geometric mean of Se in soils within the watershed was 0.30 mg·kg-1, which was higher than those in Beijing plain(0.20 mg·kg-1), Hebei plain(0.19 mg·kg-1) and China(0.29 mg·kg-1). Soils which lacked Se(0.13-0.18 mg·kg-1) were mainly distributed in Huaian, Xuanhua, and Huailai counties. Se concentrations in most areas within the watershed were sufficient(0.18-0.45 mg·kg-1). In addition, Wanquan, Xinghe, Tianzhen and Yanggao counties also had some selenium-rich areas. Concentrations of Se were different under different land use types. They were of the following order: forest land>industrial and mining land>grassland>agricultural land. Agricultural land had the lowest concentrations of Se, with a mean concentration of 0.28 mg·kg-1. We also found that parent materials and soil types had no significant effects on soil Se concentrations within the Yanghe Watershed. The results indicated that Se concentrations were positively and significantly correlated with clay contents and altitudes, but negatively and significantly with pH values. Furthermore, TOC, Fe and Al concentrations were also important factors influencing the Se concentrations in soils within the Yanghe Watershed. |
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