声明
CONTENTS
ABSTRACT
摘要
Chapter 1 Review of literature
1.1.Enzymes activities in soils
1.1.1 Overview
1.1.2 Significance of enzymes activities in soils
1.2.Factors effecting enzymes activities in soils
1.2.1 Organic amendments
1.2.2 Inorganic amendments
1.2.3.Moisture contents
1.2.4 pH
1.3.Soil microbial biomass and community
1.3.1 Overview
1.3.2.Significance of soil microbial biomass and community
1.4.Factors effecting soil microbial biomass and community
1.4.1.Organic amendments
1.4.2.Inorganic amendments
1.4.3.Moisture content
1.4.4.PH
1.5.Microcalorimetry
1.5.1.Overview
1.5.2.Significance of microcalorimetry
1.5.3.Advantages of microcalorimetry over traditional techniques/methods
1.6.Application of microcalorimetry
1.6.1.Determination of microbial activity
1.6.2.Determination of microbial biomass
1.6.3.Determination of enzymes activity
1.7.Aims
1.7.1.Oxidative enzymes the ultimate regulator of soil organic matter
1.7.2.Microcalorimetric evaluation of soil microbiological properties in Red soil
1.7.3.Estimation of enzymatic,microbial and chemical properties in Brown soil by microcalorimetry
Chapter 2 Oxidative enzymes the ultimate regulator:implications for factors affecting their efficiency
2.1.Introduction
2.2.Materials and Methods
2.2.1.Soil sampling
2.2.2.Soil sampling sites
2.2.3.Experimental design
2.2.4.Analyses of soil and organic amendments
2.2.5.Soil enzyme activities
2.2.6.Soil C and N mineralization
2.2.7.Soil dissolved organic matter
2.2.8.Soil phenolic compounds,amino acids and reducing sugars
2.2.9.Statistical analysis
2.3.Results
2.3.1.Oxidative enzyme activities
2.3.2.Hydrolytic enzyme activities
2.3.3.Total organic matter and dissolved organic matter
2.3.4.C and N mineralization
2.3.5.Phenolic compounds,amino acids and reducing sugars
2.3.6.Soil pH
2.3.7.Correlation analysis
2.4.Discussion
2.4.1.Oxidative and hydrolytic enzymes and organic matter decomposition
2.4.2.Predominating factors affecting oxidative and hydrolytic enzymes activity
2.5.Conclusions
Chapter 3 Microcalorimetric evaluation of microbiological properties in Red soil
3.1.Introduction
3.2.Materials and Methods
3.2.1.Soil sampling and collection site
3.2.2.Experimental layout
3.2.3.Analyses of soil and organic amendments
3.2.4.Analysis of soil microbial biomass
3.2.5.Analysis of soil microbial population
3.2.6.Microcalorimetry
3.2.7.Statistical analyses
3.3.Results
3.3.1.Soil redox potential (Eh) under plant residues and dogmatic water gradients
3.3.2.Soil microbial biomass and its links with microcalorimetric parameters
3.3.3.MBC/MBN ratio plant residues and dogmatic water gradients
3.3.4.Soil microbial communities and their correlations with microcalorimetric parameters
3.3.5.Microcalorimetric parameters under organic manipulation and stringent water regimes
3.4.Discussion
3.4.1.Microcalorimetric parameters as indices of soil microbial properties
3.4.2.Microcalorimetric parameters as influenced by organic treatments and water gradients
3.4.3.Impact of organic amendments and water regimes on soil microbial properties
3.5.Conclusions
Chapter 4 Estimation of enzymatic and biochemical properties in Brown soil by microcalorimetry
4.1.Introduction
4.2.Materials and Methods
4.2.1.Soil sampling
4.2.2.Experimental design
4.2.3.Analyses of soil and organic amendments
4.2.4.Soil enzyme activities
4.2.5.Soil microbial biomass and population
4.2.6.Soil C and N mineralization
4.2.7.Soil dissolved organic matter
4.2.8.Microcalorimetry
4.2.9.Statistical analysis
4.3 Results
4.3.1.Soil enzymatic activities under organic manipulation and water regimes
4.3.2.Soil microbial biomass and ratio under organic manipulation and water regimes
4.3.3.Soil microbial population under organic manipulation and water regimes
4.3.4.Relationship of soil enzymatic and microbial activities with microcalorimetric parameters
4.3.5.Soil chemical properties under organic manipulation and water regimes
4.3.6.Soil chemical properties and their association to microcalorimetric parameters
4.3.7.Microcalorimetric parameters under organic manipulation and water regimes
4.4.Discussion
4.4.1.Microcalorimetric parameters as indices of soil enzymatic,microbial and chemical properties
4.4.2.Impact of organic amendments and water regimes on soil enzymatic,microbial and chemical properties
4.5.Conclusions
Chapter 5 Concluding Remarks and Perspectives
References
ACKNOWLEDGEMENT
LIST OF PUBLICATIONS