植物对~(137)Cs污染土壤的修复

选用了南瓜、油菜、虎尾草、红梗叶甜菜、东升叶甜菜和红甜菜等几种植物,通过盆栽模拟,研究不同活度137Cs污染的广东大亚湾水稻土、浙江秦山水稻土和北京褐土的生物修复作用。结果表明,供试植物在3种土壤上均对137Cs有较强的吸收能力,并随137Cs施入量的增加而增加,两者呈显著正相关r2=0.9989。在污染水平相同的情况下,试验发现,虎尾草、油菜和南瓜所吸收137Cs的比活度随土壤的pH值降低而增加。6种植物的生物修复能力差异较大,综合评价结果为,对137Cs污染土壤修复能力的顺序是:虎尾草>油菜>红梗叶甜菜>南瓜>红甜菜>东升叶甜菜。

PLANT REMEDIATION OF SOIL CONTAMINATED WITH ~(137)Cs

A pot experiment was conducted to evaluate the bio-remediation of soils contaminated with 137Cs. The selected plants are Cucurbita moschata Duchesne, Brassica chinensis L,Chloris virgata, Beta oulgaris L.Hongye, Beta oulgaris L.Dongshengye and Beta oulgaris L. The soils samples were taken from the paddy field, 2 km from the Dayawan nuclear power plant and Qinshan nuclear power plant,respectively, and cinnamon soil from the cultivated land in Beijing. The results show that all the employed species of plant have a higher accumulation to 137Cs with the increased grade of the radioactivity of 137Cs. A good correlation exist with the coefficient (r2) of 09989. When the contaminated radioactivity of 137Cs is in the same level the uptake of Cucurbita moschata Duchesne, Brassica chinensis L. and Chloris virgata increased with the decrease of pH value ranged 522～769. The ability of bioremediation in the orders were Chloris virgata, Brassica chinensis L., Beta oulgaris L.Hongye, Cucurbita moschata Duchesne, Beta oulgaris L.and Beta oulgaris L.Dongshengye, according to the comprehensive evaluation of transfer factor, specific activity of plant in dry weight of biomass and total absorption of 137Cs by the individual plant in the same area.