当前位置:
文档之家› 微生物与植物联合修复土壤重金属污染
微生物与植物联合修复土壤重金属污染
than
that in
non
accumulators.In the heavy metal accumulators,the
proportion
of
heavy metal resistant strains in endophytic fungi Was However,in the
non
higher
studied the endurance
anti-heavy metal nature
of microbes
of the
samples,selected strains with
ones
good
for heavy metals,from which we further selected the and Cd and tested
或Ni以及复合添加Cd和Ni的土壤中,单一接种抗性菌或两株菌的复合接种都提 高了重金属在植物体内的转运系数和累积系数。不接菌处理时,与单一重金属cd
或Ni污染的情况下比较,在CA.Ni复合污染状况下Cd和Ni的转移系数和富集系 数都提高,植物地上和地下cd和Ni的浓度都比单一重金属污染土壤中植物体内的 含量增加。这表明植物对Cd和Ni的吸收存在一定的正相关性.
complex
strains inoculate the
or
effect was more obvious when two of the microbes complex were inoculated.In the soil added with only Cd
or
Ni,both
single stain inoculate and
物质的吸收,提高植物的抗重金属胁迫能力等,从而保护植物减弱伤害,还有可能
促进植物对重金属的富集,进而加快土壤重金属污染修复进程。 微生物的生存范围很广,土壤中和植物体内都有多种微生物存在.本论文通过 对大宝山采矿废水污染地区的土样和植物样采集,研究两类样品中微生物的重金属 抗性,筛选对重金属耐性较强的菌株,并从这些抗性菌中挑选出对Ni和Cd同时具有 较强抗性的微生物,研究其生物学特性,最后用盆栽试验检验抗性菌株与植物对重 金属污染土壤联合修复效应.研究结果如下: 1通过纯培养分离方法分别从重金属富集植物(大叶相思)与非富集植物(水 禾、水稻)根内及根际分离到不同种类的真菌菌株,对其中重金属抗性菌株的筛选 结果表明:三种植物内生真菌中重金属抗性菌株比例高于根际真菌,其中重金属富 集植物的内生真菌抗性菌株数目高于非富集植物内生真菌,且富集植物重金属抗性 内生真菌的比例明显高于根际真菌,但非富集植物水禾和水稻重金属抗性内生真菌 的比例与根际真菌菌株差别并不明显。这些重金属抗性真菌多属于青霉、曲霉、镰 刀菌、木霉等与植物有密切关系的种属。这些结果初步表明重金属富集植物内生真 菌与其宿主植物富集重金属的能力有密切关系.
a
and
Trichoderma sp.,ct a1.These results indicated
close relationship
between
heavy
metal resistant endophytic fungus in heavy metal accumulators host plants to accumulate heavy metals. 2
Abstract
Once heavy metals,such
as
Pb,Cd(non-biology
surviving
elements)as well
as Zn,
Ni(biology
surviving
can
elements)have
reached certain concentrations after
plants
on
the
soils
witll heavy metal pollution.Results from the study were summarized
as
follows:
1 The method of pure culture isolation was used to obtain different kinds of fungus strains from the roots and thizospheres of
关键词;植物重金属
内生菌根际微生物联合修复
Ⅱ
中山大学硕士学位论文
Micro—phyto
combined remediation
on
heavy metal polluted soils
Major:Environment Science
Name:Jiang Miu
Supervisor:Prof.Zhang Renduo
and
those in rhizosphere.The heavy metal resistant fungi in the plants mainly belong to the
species closely related
to
plants,such as
Penicillium sp.,Aspergillus sp.,Fusarium sp.
having strong resistance to Hi
studied
their biological nature.Lastly,utilizing the pot culture experiment,we effects
the combined remediation
of
the resistance strains and
than that in rhizosphere.
accumulators(Hygroryza
aristata and Oryza
sativa),the
proportion
difference of heavy metal resistant strains was not obvious between endophytic fungi
the plant growth to
3 In heavy metal polluted soils,those resistant strains certain extent,resulting in higher heights
and
larger fresh
weights.The enhancement
translocation factor and bioaccumulation
Ni),the
as
coefficient and
of Cd and Ni,as well increased in the
the
concentrations
of Cd
and
Ni in the shoots
roots of plants
中山大学硕士学位论文
2
G16和}【8对重金属Cd和Ni都具有较强抗性,经鉴定,G16为曲霉菌,鹏
为木霉菌。两株菌对重金属都有一定的活化能力但两株菌都不产吲哚。
3抗性微生物对重金属污染土壤中生长的植物有一定的促进作用,其株高、鲜
重都高于对照,尤其是两种微生物复合接种,促进作用更为明显。在单独添加Cd
microbes,combined remediation.
中山大学硕士学位论文
第1章文献综述
1.1研究背景
土壤是农业生产的基础,是人类环境的组成部分,是人类最基本、最广泛、最
重要、不可替代的自然资源。由于土壤中存在着大量的有机物、无机物、微生物和
enhanced heavy metal translocation factor
and
bioaccumulation
coefficient in
plants.
In the case of no.inoculation,compared with single heavy metal pollution(CA
by
microbes
on
is very wide and there analyses of soil-and
areaΒιβλιοθήκη variety ofmicrobes
an area
existing in soils and plants.Based
plant・sam#es
from
polluted with
mining waste water in Dabao Mountain,in this thesis,first we
中山大学 硕士学位论文 微生物与植物联合修复土壤重金属污染 姓名:姜敏 申请学位级别:硕士 专业:环境科学 指导教师:张仁铎 20070607
中山大学硕士学位论文
微生物与植物联合修复土壤重金属污染
环境科学 硕士生:姜敏 指导老师:张仁铎教授
摘要
当铅、铬、镉等非生物生存所需的重金属以及锌、镍等生物生存所需的重金属 物质在介质中达到一定的浓度时可能会对生物产生抑制作用,但自然界中的一些微 生物与重金属长期接触后,却能减少被毒害程度或受毒后迅速恢复生长。在重金属 含量较高的介质中,抗重金属微生物和植物之间的相互作用不仅会影响植物对营养
to aspergillus,sp and H8 belongs to
trichoderma sp.,both of which possessed Certain ability of activating heavy metals but did not
produce indole. promoted
a
in the media,
microbe growth some