Only recently have investigators co

Only recently have investigators considered using these plants to clean up soil and waste sites that have been contaminated by toxic levels of heavy metals-an environmentally friendly approach known as phytoremediation. This scenario begins with the planting of hyperaccumulating species in the target area, such as an abandoned mine or an irrigation pond contaminated by runoff. Toxic minerals would first be absorbed by roots but later relocated to the stem and leaves. A harvest of the shoots would remove the toxic compounds off site to be burned or composted to recover the metal for industrial uses. After several years of cultivation and harvest, the site would be restored at a cost much lower than the price of excavation and reburial, the standard practice for remediation of contaminated soils. For examples, in field trials, the plant alpine pennycress removed zinc and cadmium from soils near a zinc smelter, and Indian mustard, native to Pakistan and India, has been effective in reducing levels of selenium salts by 50 percent in contaminated soils.

結果 (中文) 1:

只是最近才有考虑使用这些植物的有毒的重金属的环境友好的方式称为植物修复程度来清理土壤和废物被污染的网站的调查。这种情况下开始种植积累物种中的目标区域，例如一个废弃矿井或受径流污染灌溉池塘。首先能吸收有毒矿物根但后来搬迁到茎和叶。一片丰收的芽会删除离现场焚烧或堆肥来回收金属作工业用途的有毒化合物。经过几年的种植和收获，网站将会恢复比开挖和重新安葬，污染土壤修复标准操作规程的价格低得多的代价。例如，田间试验，在植物高山菥蓂去除锌和镉锌冶炼厂和印度芥菜，原产于巴基斯坦和印度，附近的土壤中已有效地减少污染土壤中 50%的硒盐水平。

結果 (中文) 3:

最近才有研究人员考虑使用这些植物来清理土壤和垃圾污染的重金属污染的环境友好的方法被称为植物修复的网站。这种情况下植物开始在目标区域种植，如一个废弃的矿井或被污染的灌溉池。有毒的矿物质首先被根吸收，但后来转移到茎和叶。收获的枝叶将移除有毒化合物非现场被焚烧、堆肥回收金属用于工业用途。经过几年的种植和收割，该网站将在成本比挖掘和重新安葬的价格低得多的恢复，对污染土壤修复标准的实践。例如，在现场试验中，阿尔卑斯菥植物锌厂附近的土壤中去除锌和镉，和印度芥菜，原产于巴基斯坦和印度，已经被污染土壤中的硒盐水平，有效降低百分之50。