共查询到19条相似文献,搜索用时 234 毫秒
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分析了我国重金属污染现状,从超富集植物、植物挥发、植物积累、植物代谢、植物固定等方面探讨了重金属污染修复技术,阐述了超富集植物修复机型,为重金属污染土壤治理提供参考。 相似文献
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我国农耕地有1/5被重金属污染,目前治理土壤重金属污染常用理化方法,但成本昂贵,存在一定局限性.现在植物修复被重金属污染的土壤的技术,受到广泛重视.植物修复技术有植物吸收、植物挥发、植物稳定三大类型,它们各有自己的优缺点,运用综合技术修复被污染的土壤,成为未来的研究和发展方向. 相似文献
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铅锌超富集植物及耐性植物筛选研究进展 总被引:4,自引:0,他引:4
目前利用重金属超富集植物的提取作用从污染土壤中去除重金属被认为是最有前途的重金属污染土壤修复技术之一.本研究从植物修复作用机理入手,分析了超富集植物和耐性植物的特点与解毒机制,列出了Pb-Zn超富集植物种类,最后分析了Pb-Zn植物筛选中存在的问题,并对超富集植物的筛选和植物修复工作研究进行了展望,旨在为重金属铅锌超富集植物和耐性植物筛选研究提供技术参考. 相似文献
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浅谈土壤重金属污染的植物修复 总被引:1,自引:0,他引:1
我国农耕地有1/5被重金属污染,目前治理土壤重金属污染常用理化方法,但成本昂贵,存在一定局限性。现在植物修复被重金属污染的土壤的技术,受到广泛重视。植物修复技术有植物吸收、植物挥发、植物稳定三大类型,它们各有自己的优缺点,运用综合技术修复被污染的土壤,成为未来的研究和发展方向。 相似文献
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植物对土壤Cd、Pb污染的修复与抗性机理研究进展 总被引:3,自引:0,他引:3
近年来,土壤重金属污染呈现扩大趋势,其中Cd、Pb污染尤为严重。重金属污染治理方法虽有很多,但各有利弊。传统的物理和化学治理方法存在花费高、操作难、容易破坏土壤理化特性和干扰土壤生物多样性等问题。近年来,植物修复技术逐渐被人们所认知和重视,它具有原位修复、廉价、对环境友好等优点。文中从重金属Cd、Pb对植物的影响、植物修复技术和植物抗性机理3个方面对国内外相关研究进展进行综述,并展望今后的发展方向,以期对未来土壤重金属污染修复技术和基础研究提供参考。 相似文献
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A. Fedorkov 《Forest Pathology》2007,37(2):136-142
A field experiment with artificial soil contamination by the heavy metals copper and nickel was established in Kola Peninsula, northern Russia. To study the effect of soil contamination by heavy metals without SO2 air pollution on the Scots pine trees growth the experiment was located outside the range of forest damage due to emissions from a copper–nickel smelter. Retardation in tree diameter growth over 15 years after contamination with 20 kg of metallurgical dust per 100 m2 plot was 54%, 10 kg 27%, 5 kg 16% and 2.5 kg 7%, respectively, compared with growth in control plots. Thus, decreasing Scots pine growth due to heavy metal pollution was demonstrated. 相似文献
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桉树在土壤重金属污染区土壤生物修复的应用前景 总被引:1,自引:0,他引:1
本文首先提出了重金属污染的概念,指出了土壤修复的几种基本方法及其优缺点,对我国土壤重金属污染的现状及土壤重金属污染植物修复技术的研究进展进行了概括和总结。阐述了桉树作为重金属污染富集植物的研究依据,认为将桉树用于重金属污染土壤的修复,一方面可在避免种植食用性植物前提下对重金属污染的土壤实行植物修复,另一方面可缓解当前木材资源供给压力,提高经济收益,具有明显的科学和现实意义。 相似文献
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林地在维持森林生态系统稳定、保护物种多样性、促进经济发展及保障人民生活等方面起着重要作用。但如今大气干湿沉降、矿区及工业生产污染以及有机肥超量施用等造成的重金属污染问题正日益威胁着森林生态系统正常功能的发挥。微生物在林地重金属污染修复方面具有明显效果,对其修复机制进行研究具有重要的理论意义。文中综述林地重金属污染物的来源及微生物修复机制,介绍微生物对重金属的吸附、累积,通过代谢过程对重金属进行氧化、还原、甲基化、去甲基化等生物转化,以及通过矿化、络合作用钝化重金属来修复重金属污染等修复机理,并提出研究展望,以为后续林地土壤微生物修复提供参考。 相似文献
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Hermle S Vollenweider P Günthardt-Goerg MS McQuattie CJ Matyssek R 《Tree physiology》2007,27(11):1517-1531
Fast-growing trees such as Salix viminalis L. and Populus tremula L. are well suited to phytoremediate heavy metal contaminated soils. However, information on tree performance, particularly leaf function, under conditions of heavy metal contamination is scarce. We used yearly coppiced saplings of S. viminalis and P. tremula growing in model ecosytems to test four hypotheses: (1) heavy metal contamination impairs photosynthesis by injuring leaf structure; (2) the effects of heavy metal contamination are enhanced by acidified rainwater and low soil pH; (3) heavy metal contamination increases dark respiration and, thus, repair processes; and (4) heavy metal contamination is tolerated and remediated better by S. viminalis than by P. tremula. We investigated heavy metal accumulation, tissue injury and gas exchange in leaves of plants subjected to controlled soil contamination with heavy metal dust. Additional treatments included acidic and calcareous natural forest subsoils in combination with irrigation with rainwater at pH 5.5 or 3.5. In both provenances of P. tremula that were studied, but not in S. viminalis, heavy metal treatment reduced photosynthesis and transpiration by varying amounts, except in the hot and dry summer of 2003, but had no effect on dark respiration. At light saturation, net CO(2) uptake and water-use efficiency were reduced by heavy metal contamination, whereas the CO(2) concentration in the leaf intercellular air space was increased. Rainwater pH and subsoil pH only slightly modified the effects of the heavy metal treatment on P. tremula. Gas exchange responses of P. tremula to heavy metals were attributed to leaf structural and ultrastructural changes resulting from hypersensitive-response-like processes and accelerated mesophyll cell senescence and necroses in the lower epidermis, especially along the transport pathways of heavy metals in the leaf lamina. Overall, the effects of heavy metals on P. tremula corroborated Hypothesis 1, but refuted Hypotheses 2 and 3, and were inconclusive for Hypothesis 4. Both P. tremula and S. viminalis showed appreciable potential for storing heavy metals in aging foliage. 相似文献