声明
摘要
Abstract
1 Introduction
1.1 The physicochemical properties and meehanism of Atrazine
1.1.1 The physicochemical properties of Atrazine
1.1.2 The mechanism of Atrazine
1.2 Present situation and application of atrazine pollution of atrazine in black soil area
1.2.1 Application of Atrazine
1.2.2 Pollution status in black soil region of Northeast China
1.3 The harm of atrazine pollution
1.3.1 Atrazine harm to ecological environment
1.3.2 Atrazine hazards to human health
1.4 Biodegradation of Atrazine
1.4.1 Phytoremediation of atrazine pollution
1.4.2 Bioremediation of atrazine contamination
1.4.3 Microbial Communities involved in atrazine degradation
1.5 Hypothesis
1.6 Aims and Objectives
2 Materials and Methods
2.1 Soil Sampling
2.2 Chemicals and different carbon,nitrogen sources
2.3 Material used for Bioremediation
2.4 Opted pH and Temperature Parameters
2.5 Experimental Design to Measure Impact of Soil pH and Temperature
2.6 Soil Treatment Preparation
2.7 Preparation of Arthrobactor sp.Strain DNS10
2.8 Experimental Design for Different Bioremediation Strategies
2.9 Extraction and Determination of Atrazine from all Set Treatments
2.10 Atrazine measurement and calculation
2.11 Soil DNA extraction
2.12 Bacterial 16SrDNA V3 PCR amplification of the variable region gene
2.13 Denaturing gradient gel electrophoresis(DGGE)method of operation
2.14 Statistical Analysis
3 Results
3.1 Residual atrazine under different parameters
3.2 Atrazine removal percentage at different pH and temperatures
3.3 Temperature and pH significances on different bioremediation approaches
3.4 Extractable atrazine concentration in different selected sources
3.5 Atrazine degradation potential of different bioremediation strategies
3.6 Percentage of atrazine bioremediation for each microcosm
3.7 Correlation coefficient matrix for different bioremediation variables
3.8 PCR-DGGE Anlaysis
4 Discussion
4.1 Pesticide and herbicide contamination
4.2 Atrazine contamination
4.3 Atrazine bioremediation
4.4 Effective Bioremediation Techniques
4.5 Use of microbial strains in atrazine bioremediation
4.6 Different carbon and nitrogen sources utilized in atrazine bioremediation
4.7 Combined application of bioremediation treatments
4.8 Consequences of recent study
4.9 Impact of soil pH and temperature on atrazine bioremediation
Conclusion
Acknowledgements
References
Research Publication in Period of Ph.D Education