| 天津市典型污灌区冬小麦各生育期的重金属分析 |
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| 引用本文： | 马传鑫,汪志荣,高琼,金星龙,何莎.天津市典型污灌区冬小麦各生育期的重金属分析[J].环境化学,2010,29(1). |
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| 作者姓名： | 马传鑫 汪志荣 高琼 金星龙 何莎 |
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| 作者单位： | 天津理工大学环境科学与安全工程学院,天津,300384 |
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| 基金项目： | 天津市教委项目(20060520)资助 |
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| 摘 要： | 通过对天津市冬小麦生长的各个阶段的各个部位及土壤中重金属含量的分析,评价了污灌区农田土壤-植被系统的污染状况,运用转运系数和富集系数表征了重金属元素在作物中迁移和积累的能力.结果表明,冬小麦田土壤质量属2级尚清洁标准,土壤中Cd污染最严重,Hg污染次之.返青期、拔节期、抽穗期和成熟期,同一时期冬小麦不同部位的重金属含量整体呈现自下至上递减的趋势,即根>茎>叶>果实,而同一部位冬小麦的不同时期的重金属含量各有特点.从转运系数和富集系数上看,根富集重金属的能力要大于茎、叶和果实;重金属由土壤向根迁移的过程中,迁移能力顺序为:Pb>Cd>Hg>Cr>As,Pb迁移能力最强.冬小麦果实中As,Cd,Cr,Hg,Pb和Se含量均超过《食品中污染物限量》中规定的限值,说明研究区域目前已经不宜再种植冬小麦.
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| 关 键 词： | 冬小麦 污灌区 土壤-植物系统 生育期 重金属 |
HEAVY METAL ANALYSIS OF WINTER WHEAT AT EACH STAGE IN TYPICAL SEWAGE IRRIGATED AREA OF TIANJIN |
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| MA Chuan-xin,WANG Zhi-rong,GAO Qiong,JIN Xing-long,HE Sha.HEAVY METAL ANALYSIS OF WINTER WHEAT AT EACH STAGE IN TYPICAL SEWAGE IRRIGATED AREA OF TIANJIN[J].Environmental Chemistry,2010,29(1). |
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| Authors: | MA Chuan-xin WANG Zhi-rong GAO Qiong JIN Xing-long HE Sha |
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| Institution: | School of Environmental Science and Safety Engineering;Tianjin University of Technology;Tianjin;300384;China |
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| Abstract: | Based on the analysis of heavy metal content of wheat and soil at different period,the contamination extent of soil-plant system is assessed,and transportation factor(TF)and bio-concentration(BCF)are used to describe heavy metal ability of transportation and deposition in winter wheat.From the results,soil quality of winter wheat field in xiqing district,Tianjin,belongs to levels 2,the highest pollutant is Cd,Hg is second.At different stages,including turn green,jointing,heading and ripeness,the content of ... |
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| Keywords: | winter wheat sewage irrigated area soil-plant system growth period heavy metals |
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