土壤污染的植物修复机理简介英文版

• Phytovolatilization
Taking use of plant roots to absorb pollution elements and promoting them into volatile form.The current study focuses on selenium, mercury, arsenic.
Degradation process of AT
Phenol degradation under anaerobic conditions
• Phytostabilization
The use of the patience plant roots secrete substances to reduce pollutant bioavailability and mobility. eg1:The carbon dioxide produced by the plant roots activities will change the pH of the soil,thus affecting the solubility and mobility of the metal.
• Chemical repair Precipitation（沉淀）, adsorption（吸附）, oxidationreduction, hydrolysis（水解）, polymerization（聚合）, adjusting the pH
• Biological repair Microbial remediation（微生物修复）， phytoremediation （植物修复）
Nearly 20 years
1970s to 1990s
1950s to 1970s
outlook
Basic theory
Applied Research
Screening nurture
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Modern biotechnology ◄
繁华与没落， 发展的背后隐藏的是什么？
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ATP enzyme sulfide
SeO42Anaerobic bacteria
CH3SeCH3（CH3Se2CH3）
Hg- reductase
Hg2+（soil）
As- reductase
MeHg
Hg（air）
（CH3)2AsO2-
（CH3)2As or As(g)
Others：populeas（杨树）—ChlorinБайду номын сангаасted solvents（氯化溶剂） Seres lac viciam（紫云英）—TCE（三氯乙烯）
• Brief mechanism of absorption and transformation of heavy metals by plants The plant through the region, forming depossition or chelate for detoxification of heavy metals inside the cell,and the chelating effect is the most important, chelating substances found in plants are mainly MTs(金属硫蛋白)，PCs（植物螯 合素），organic acid(有机酸)，amino acid(氨基酸).
指利用植物及其根际微生物的共存体系来吸收、容纳、转化、或转移 污染物的特性，通过在污染地种植植物，实现部分或完全修复土壤、 水体和大气污染的一门环境污染原位治理技术。
Section II The mechanisms of phytoremediation technology
phytoextraction(植物提取作用)
eg2:Root exudates of certain metal-binding proteins and certain special organic acids can chelate heavy metals. Adhesive substance secreted by root and rhizosphere of pb2 +, Cu2 +, Cd2 +and other heavy metal ion complexation, the formation of a stable chelate pollution pollutants in soil.
eg：Thelaspi caerulescens—Zn
Potential cellular mechanisms available for metal detoxification and tolerance in Thelaspi caerulescens 蓝天遏蓝菜重金属耐性及解毒的细胞学机制
Seres lac viciam（TCE）
Indico sinapis（Se）
populeas（Chlorinated solvents）
• Phytodegradation
Phytodegradationis the process that the pollutants absorbed by plants through the participant of Enzymes and plant hormones of plant in the metabolic process and degradation in plants in vitro. The main mechanism of degradation of organic pollutants in plants, including hydroxylation（羟基化作用)and the enzyme oxidative degradation（酶氧化降解) process. Organic pollutants can be metabolized in plants：AT(除草剂阿 特拉津)，TNT，DDT，HBC(杀真菌剂)，DEHP(增塑剂)， PCBs(多氯联苯),etc.
• Rhizo-degradation
By the combined effect of plant roots and soil microbial degradation of organic pollutants.
Types: Aerobic metabolism Anaerobic degradatio Humification
①Binging to cell wall and root exudates ②Repair of cell wall ③Efflux into apoplast by heavy metal transporter ④Repair protetion of plasma membrane ⑤Chelation in cytosol by various ligands ⑥Scavenging active oxygen by antioxidant system ⑦Transport and accumlation metals in vacuole
Phytoremediation
• Refers to the use of plants and their rhizosphere microorganisms coexist system to absorb, accommodate, transformation, or the characteristics of the transfer of pollutants, pollution to grow plants, partially or completely repair an environmental pollution of soil, water and air pollution in situcontrol technology.
● Concept
● The mechanisms of
phytoremediation technology
● Look into the future
Section I Concept
Classification of the soil repair
• Physical repair Tilling the soil(翻土), new soil（客土）, heat treatment（热 处理）, leaching（淋洗）, curing（固化）, landfill（填 埋）.
phytodegradation（植物降解作用） phytovolatilization（植物挥发作用） phytostabilization（植物稳定作用） rhizo-degradation（根标降解作用）
mechanisms
●Phytoextraction(植物提取作 用)
Hyperaccumulator（重金属超富集植物） absorb heavy metals from the soil and transported to the harvesting of the site.
Microbial degradation of Bap
Section III Look into the future
Future development
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Broad prospects A branch of the environmental treatment of pollutants developed rapidly Turned their attention to hyperaccumulators Hyperaccumulators Research plant heavy metal tolerance mechanism starting
惊变——大自然
保护我们的地球 保护生存的环境
replay
Thank you~~~
First discovered hyperaccumulator nickel hyperaccumulators， Originating in South Africa the herb Berkheya coddii leaves containing Ni content up to 11600mg/Kg. Zinc hyperaccumulators, cadmium hyperaccumulator, lead hyperaccumulators, arsenic hyperaccumulator, etc.