沈阳张士污灌区4种杂草不同阶段富集Cd的研究  

Enrichment of Cadmium at Different Growth Periods of 4 Weeds in Shenyang Zhangshi with Wastewater Irrigation

作　　者：文秋红[1] 史锟[1] 于丽华[1] 

机构地区：[1]大连交通大学环境科学与工程学院,辽宁大连116028

出　　处：《农业环境科学学报》2005年第5期843-848,共6页Journal of Agro-Environment Science

基　　金：国家自然科学基金杰出人才基金资助(39425013)

摘　　要：通过在沈阳张士Cd污染区不同阶段(每月月底)采集4种生物量较大的杂草、土壤和水,研究杂草镉富集数量及其富集量最大的时期。在杂草Cd吸收量最大时期收获杂草,可从土壤中带走更多的Cd。结果表明,4种杂草根Cd富集数量最大值的顺序为,稗草(Echinochtoacrusgalli)(84.48mg·kg-1)>藜(Chenopodium)(71.39mg·kg-1)>芦苇(Phragmites)(29.77mg·kg-1)>蒲草(Typha)(7.56mg·kg-1);芦苇、藜和稗草所有测定时期Cd含量都是根>茎叶,蒲草在8月份和9月份测定Cd含量为茎叶>根。藜根和茎叶在8月份达到最大值;芦苇根8月份吸收Cd量最大,茎叶5月份Cd含量最大;蒲草根7月份吸收Cd量最大,茎叶8月Cd含量最大;稗草根和茎叶在6月份Cd含量最大。土壤Cd含量有随温度增加而增加的趋势,最大值为29.44mg·kg-1;水的Cd含量均小于植物和土壤。杂草Cd含量变化与土壤和水Cd含量变化有一定的相关性。Absorption and accumulation of Cd at different growth periods by 4 weeds growing in Cd-contaminated area at Zhangshi Irrigation in Shenyang were studied with sampling each month. It has been found that enrichment of Cd in the 4 weeds was in an order： Echinochtoa crusgalli〉 Chenopodium 〉Phragmites〉Typha, and the highest Cd concentration （84.48 mg·kg^-1） was discovered in Echinochtoa crusgalli in June. The distribution of Cd concentrations were： root〉shoot in Echinochtoa crusgalli, Chenopodium and Phragmites, but in Typha, Cd concentration was higher in shoot than that in root during August to September. Cd uptake and accumulation in Chenopodium root and shoot were enhanced in August. While in Chenopodium Cd in shoot was enhanced in May and in root was in August, but Cd concentration of Typha root in July reached the highest concentration. In order to eliminate more Cd from soil, and harvesting Echinochtoa crusgualli, Chenopodium, Phragmites, Typha in June, August, August and July respectively, is proposed, according to the results mentioned above. The Cd concentration in soil increased with temperature and the highest Cd concentration was found to be 29.44mg·kg^-1. The Cd concentrations of water were lower than that of weeds and soil.

关 键 词：Cd污染区 杂草 生长阶段 富集 

分 类 号：X173[环境科学与工程—环境科学]