Natural colonizers effectively restore heavy metal polluted wasteland.

IF 3.4 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Lakshmi Pathak, Kavita Shah
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引用次数: 0

Abstract

In India, ∼30% of total land is degraded due to pollution, salinization, and nutrient loss. Change in soil-quality at urban waste-dumping site prior and after cow-dung amendment was compared with control agriculture soil. The soil at waste-dumping site had elevated pH, EC, temperature and lowered OC and NPK concentrations when compared to control. Polymetallic pollution of Cr, Cd, Pb, and Ni beyond permissible limits was obtained. Cow-dung amendment restored soil physicochemical properties at the waste-dumping site, with increasing soil moisture, CEC and OC; however, a slight change in soil bulk-density and heavy-metal concentration post-amendment was noted. The seven natural colonizers present at the waste-dumping site accumulated more metals in roots than shoots. Datura innoxia had maximum bioaccumulation of Cr, Calotropis procera of Cd and Ni and Parthenium hysterophorus of Pb in roots. All these plants had Bioacccumulation factor (BAfroot )>1 and translocation factor (Tf) <1 for Cd and serve as its phytostabilizer except Calotropis procera which had BAfroot >1 and Tf >1 and is identified as a phytoextractor for Cd. Cow-dung amendment alone appeared to be insufficient and additionally the revegetation of natural colonizers is recommended for effective reduction in heavy metal load and improving overall soil health at wasteland. Such eco-restoration may also minimize risks to biodiversity in India.

自然殖民者能有效恢复被重金属污染的荒地。
在印度,由于污染、盐碱化和养分流失,30% 的土地退化。牛粪添加前后,城市垃圾倾倒地的土壤质量变化与对照农业土壤进行了比较。与对照组相比,垃圾倾倒地土壤的 pH 值、EC 值、温度升高,OC 和 NPK 浓度降低。铬、镉、铅和镍的多金属污染超出了允许限值。牛粪改良剂恢复了垃圾倾倒地的土壤理化性质,增加了土壤水分、CEC 和 OC;但改良后土壤容重和重金属浓度略有变化。废物倾倒地点的七种自然定殖物在根部积累的金属多于芽部。曼陀罗(Datura innoxia)根部对铬的生物蓄积量最大,柘树(Calotropis procera)根部对镉和镍的生物蓄积量最大,蕨类植物(Parthenium hysterophorus)根部对铅的生物蓄积量最大。所有这些植物的生物累积因子(BAfroot)均大于 1,而转位因子(Tf)则大于 1。仅靠牛粪添加剂似乎还不够,因此建议在荒地上重新种植天然定殖植物,以有效减少重金属负荷,改善整体土壤健康状况。这种生态恢复还可以最大限度地降低对印度生物多样性的风险。
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来源期刊
International Journal of Phytoremediation
International Journal of Phytoremediation 环境科学-环境科学
CiteScore
7.60
自引率
5.40%
发文量
145
审稿时长
3.4 months
期刊介绍: The International Journal of Phytoremediation (IJP) is the first journal devoted to the publication of laboratory and field research describing the use of plant systems to solve environmental problems by enabling the remediation of soil, water, and air quality and by restoring ecosystem services in managed landscapes. Traditional phytoremediation has largely focused on soil and groundwater clean-up of hazardous contaminants. Phytotechnology expands this umbrella to include many of the natural resource management challenges we face in cities, on farms, and other landscapes more integrated with daily public activities. Wetlands that treat wastewater, rain gardens that treat stormwater, poplar tree plantings that contain pollutants, urban tree canopies that treat air pollution, and specialized plants that treat decommissioned mine sites are just a few examples of phytotechnologies.
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