声明
ABSTRACT
摘要
CONTENTS
CHAPTER 1．INTRODUCTION AND REVIEW OF LITERATURE
1．1 Potentially toxic trace elements(PTEs)
1．2 Sources of potential toxic trace elements(PTEs)in the environment
1．3 Global overview of PTEs pollution
1．4 Chinese scenario of soil pollution
1．5 Detrimental impacts of PTEs on public health and plants
1．5．1 Zinc(Zn)
1．5．2 Lead(Pb)
1．5．3 Cadmium(Cd)
1．5．4 Copper(Cu)
1．5．6 Mercury(Hg)
1．5．7 Arsenic(As)
1．5．8 Chromium(Cr)
1．5．9 Aluminum(Al)
1．6 Soil remediation techniques
1．7 Phytoremediation and its importance
1．8 Microbes assisted phytoremediation
1．9 Streptomyces pactum for phytoremediation：A novel soil microorganism
1．9．1 Fate of plants used in the phytoremediation of PTEs
1．9．2 Immobilization of PTEs in polluted soil using organic amendments
1．9．3 The nature of biochar and its potential to adsorb PTEs
1．9．4 Limitations of biochar as soil amendment
1．10 Effect of PTEs on enzyme activity
1．10．1 Soil enzymatic activities affected by PTEs
1．10．2 Plant antioxidant activities as function of soil contamination
1．11 Research objectives
CHAPTER 2．MATERIALS AND METHODS
2．1．2 Feng County(FC)
2．1．3 Chenzhou(CZ)
2．2 Materials Collection
2．2．1 Collection of contaminated soil samples
2．2．2 Isolation of Streptomyces pactum
2．2．3 Raw materials for composting
2．2．4 Biochar collection
2．3 Experimental Methods
2．3．1 Soil，compost and biochar analysis
2．3．2 Plant analysis
2．4 Quality control and statistical analysis
CHAPTER 3．ROLE OF STREPTOMYCES PACTUM IN PHYTOREMEDIATION OF TRACE ELEMENTS IN MINE POLLUTED SOILS OF SHAANXI，NORTHWEST CHINA
3．1 Introduction
3．2 Materials and Methods
3．2．1 Samples collection
3．2．2 Experiment Methods
3．3 Results and Discussion
3．3．1 Characteristics of the studied soils and medical stone compost
3．3．2 Effect of Streptomyces pactum on PTEs uptake by Brassica juncea
3．3．3 Effect of Streptomyces pactum on growth attributes of Brassica juncea
3．3．4 Effect of Streptomyces pactum on leaf antioxidant activities
3．3．5 Phytoextraction indices of trace elements
3．4 Conclusions
CHAPTER 4．USING BAMBOO BIOCHAR WITH COMPOST FOR STABILIZATION AND PHYTOTOXICITY REDUCTION OF TRACE ELEMENTS IN MINES CONTAMINATED SOILS OF SHAANXI PROVINCE，CHINA
4．1 Introduction
4．2 Materials and Methods
4．2．1 Materials collection
4．2．2 Experimental Methods
4．3 Results and Discussion
4．3．1 Characteristics of studied softs，medical stone compost and bamboo biochar
4．3．2 Effect of biochar amendments on soil pH and EC
4．3．3 Effect of biochar amendments on PTEs bioavailability
4．3．4 Effect of biochar on PTEs translocation in Brassica juncea shoot
4．3．5 Effect of biochar on PTEs accumulation in Brassica juncea root
4．3．6 Phytotoxicity assay of Brassica juncea in polluted soils
4．3．7 Effect of biochar on the soil enzymatic activities
4．3．8 Effect of bioehar on the plant antioxidant enzymes
4．3．9 Phytoextraction indices of PTEs
4．4 Conclusions
CHAPTER 5．INTEGRATED EFFECT OF STREPTOMYCES PACTUM(ACT12)AND BIOCHAR ON THE PHYTOEXTRACTION OF POTENTIAL TOXIC TRACE ELEMENTS IN CONTAMINATED SOILS
5．1 Introduction
5．2 Materials and Methods
5．3 Results and Discussion
5．3．1 Physico-chemical characteristics of soil，compost and biochar
5．3．2 Effect of biochar and Act12 on soil pH and EC
5．3．3 Effect of biochar and Act12 on bioavailable fraction of PTEs
5．3．4 Effect of biochar and Act12 on phytoextraction of PTEs in sorghum shoots
5．3．5 Effect of biochar and Act12 on phytoextraction of PTEs in sorghum root
5．3．6 Plant growth promotion by biochar and Act12
5．3．7 Effect of biochar and Act 12 on the soil enzymatic activities
5．3．8 Effect of biochar and Act12 on the plant anti-enzymatic activities
5．3．9 Lipid peroxidation product
5．3．10 Phytoextraction indices of PTEs
5．4 Conclusions
SUMMARY AND MAIN CONCLUSIONS
SUGGESTIONS AND RECOMMENDATIONS
REFERENCES
NOMENCLATURE
ABOUT THE AUTHOR
PUBLISHED PEER REVIEWED PAPERS(SCI)
