The aim of this thesis was the experimental evaluation of thermogravimetry (TG) to assess the status of organic matter supply in agricultural soils. TG is an innovative analytical method for recording thermal mass losses (TML) during heating of soil samples from room temperature to 950 °C. The determination of TML in 10 °C temperature increments (TG indicators) is a central method of TG data evaluation. There is a very close correlation between selected temperature ranges and classically determined soil properties (organic carbon, total nitrogen and clay content). The regression parameters of these relationships can be used to estimate soil properties and to assess the quality of SOM.:List of Tables VI
List of Figures VII
List of Abbreviations VIII
Summary 10
Zusammenfassung 13
Chapter One – Synthesis: Thermogravimetry – a promising technique to assess the status of organic matter supply in agricultural soils 16
1 Introduction 16
1.1 Soils and agriculture 16
1.2 The Importance of soil organic matter (SOM) 17
1.3 Current challenges in the assessment of SOM as an indicator of soil quality 18
1.4 Main objectives 20
2 Methodological Approach 22
2.1 General approach 22
2.2 Experimental areas and soil description 22
2.3 Application of thermogravimetric analysis (TG) 28
2.4 Experimental design 29
2.4.1 SOC content determination using TML (chapter two and chapter five) 29
2.4.2 Detectability of thermal stabilities of organic amendments in soil samples using TML (chapter two) 30
2.4.3 Comparison between biological and thermal stability of SOM (chapter two and chapter three) 30
2.4.4 Linking thermogravimetric data with soil properties, thermal stability of SOM and SOC fractions (chapter four and chapter five) 31
3 Results and Discussion 32
3.1 Thermogravimetric-based fingerprint predictions of soil properties and soil organic matter stability (chapter two and chapter three) 32
3.2 Linking thermogravimetric indicators with functional SOC fractions to assess SOM quality (chapter four and chapter five) 35
4. Research needs and perspectives 37
5. Conclusion 40
References 40
Chapter Two: Contribution of organic amendments to soil organic matter detected by thermogravimetry 51
Chapter Three: Detectability of degradable organic matter in agricultural soils by thermogravimetry 52
Chapter Four: Linking soil organic matter thermal stability with contents of clay, bound water, organic carbon and nitrogen 53
Chapter Five: Linking thermogravimetric data with soil organic carbon fractions 54
Appendix 55
List of publications 55
Acknowledgments 56
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:73264 |
| Date | 23 December 2020 |
| Creators | Tokarski, David |
| Contributors | Kalbitz, Karsten, Sommer, Michael, Leifeld, Jens, Technische Universität Dresden |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:doctoralThesis, info:eu-repo/semantics/doctoralThesis, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 10.1002/jpln.201700537, 10.1002/jpln.201800516, 10.1016/j.geoderma.2017.12.001, 10.1016/j.geoderma.2019.114124, 10.1002/jpln.201700537, 10.1002/jpln.201800516, 10.1016/j.geoderma.2017.12.001, 10.1016/j.geoderma.2019.114124 |
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