| 赵汝东,胡义镰,Ed Barrett-Lennard,Neil Coles,姜灿烂,吴嘉平.河湖底泥对农田土壤性状及DTPA态重金属的影响[J].农业环境科学学报,2015,34(1):97-102. |
| 河湖底泥对农田土壤性状及DTPA态重金属的影响 |
| Effects of River and Lake Sediments on Cultivated Soil DTPA-extractable Heavy Metals and Other Properties |
| 投稿时间：2014-07-22 |
| DOI：10.11654/jaes.2015.01.014 |
| 中文关键词: 土壤重金属 DTPA 硫 酸化 |
| 英文关键词: soil heavy metal DTPA sulfur acidification |
| 基金项目:科技部国际合作项目(#KY-2012-09-05) |
| 作者 | 单位 | E-mail | | 赵汝东 | 浙江大学环境与资源学院, 杭州 310058 | | | 胡义镰 | 浙江大学环境与资源学院, 杭州 310058 | | | Ed Barrett-Lennard | Institute of Agriculture, the University of Western Australia, Crawley, WA 6009, Australia | | | Neil Coles | Institute of Agriculture, the University of Western Australia, Crawley, WA 6009, Australia | | | 姜灿烂 | 南京农业大学资源与环境科学学院, 南京 210095 | | | 吴嘉平 | 浙江大学海岛海岸研究所, 杭州 310058 | jw67@zju.edu.cn |
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| 中文摘要: |
| 选取我国南方平原区有作物生长障碍的典型旱地和水田,采集土壤样品进行分析,诊断作物生长障碍因子.结果显示,施用底泥的水田和旱地土壤pH值均显著下降,而有效硫、电导率以及土壤DTPA态重金属(Ni、Zn、As、Cr、Co、Cu、Hg和Sn)均显著升高:土壤pH最低值为3.63,有效硫最高值达1 667.74 mg·kg-1,电导率为2 216.67 μS·cm-1.分析表明,施用底泥引起的土壤酸化和部分DTPA态重金属(特别是Ni、Zn、As和Cr)含量的升高是影响作物生长的主要因素,底泥中的盐分对其也可能有一定影响.因此,河湖库底泥农用前须进行分析和风险评估. |
| 英文摘要: |
| River sediment is rich in organic materials and could be used to amend cultivated soils. However, heavy metals in river sediment may threaten soil health and subsequently crop performance following the river sediment applied to soils. This study investigated DTPA-extractable heavy metals in cultivated soils amended with river sediment in river network plain area, Southern China. Soil samples were collected from selected paddy fields and dry land where river sediment had been applied(200~300 t·hm-2), soils from fields without river sediment application as controls. Soil pH decreased obviously(the lowest value was 3.63), while soil available sulfur, electric conductivity, and DTPA-extractable heavy metals(Ni, Zn, As, Cr, Co, Cu, Hg and Sn) increased obviously after sediment applications. The highest values of both soil available sulfur and electric conductivity were observed in dry land(1 667.74 mg·kg-1 and 2 216.67 μS·cm-1, respectively). Statistical analysis(Correlation analysis, cluster analysis and principal component analysis) further showed that river sediment applications caused the enhancement of soil heavy metals in the fields. The present results suggest that accelerated soil acidification and high DTPA-extractable heavy metals(e.g., Ni, Zn, As, Cr, Co, Cu, Hg and Sn) contribute to the poor crop-performance. Additionally, the salinity from river sediment might also affect crop performance.This study shows that environmental safety assessment must be conducted before river and lake sediments can be applied into farming land. |
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