Importance of roots for nutrient cycling

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Table of contents

Chapter 1 | Introduction
1.1 Changes in climate and biodiversity
1.2 Importance of roots for nutrient cycling
1.3 General aspects of biodiversity belowground
1.4 Fine root dynamics
1.4.1 Environmental effects on fine root dynamics
1.4.2 Biodiversity effects and resource availability
1.5 Decomposition
1.5.1 Climate and trait control on the decomposition of leaves and roots
1.5.2 Direct and indirect effects of tree diversity on decomposition
1.6 Rationale and research questions
References
Chapter 2 | Materials and Methods
2.1 Study design
2.2 Site description
2.3 Methods
2.3.1 Tree species studied and tree inventory
2.3.2 Belowground productivity and turnover
2.3.3 Vertical root profiles
2.3.4 Decomposition
2.3.5 Soil analyses
2.4 Data treatment
2.5 Organization of the Result chapters
References
Chapter 3 | Effect of tree mixtures and water availability on belowground complementarity of fine roots of birch and pine planted on sandy podzol
3.1 Introduction
3.2 Materials and Methods
3.2.1 Study site
3.2.2 Field sampling
3.2.3 Root sorting
3.2.4 Data collection and computation of root morphology variables
3.2.5 Calculation of vertical root distribution index
3.2.6 Calculation of diversity metrics
3.2.7 Data analysis
3.3 Results
3.3.1 Overall treatment effects on fine root biomass and morphology
3.3.2 Vertical root patterns
3.3.3 Relative fine root attributes
3.4 Discussion
3.4.1 General considerations
3.4.2 Effect of mixing tree species on vertical root segregation and belowground overyielding
3.4.3 Pronounced vertical root segregation and belowground overyielding under ambient water supply
3.4.4 Depth-specific effects on relative yield
3.5 Conclusion
Acknowledgements
References
Chapter 4 | Fine root dynamics in response to tree species mixing, stand density, and water availability
Abstract
4.1 Introduction
4.2 Materials and Methods
4.2.1 Study site and experimental design
4.2.2 Fine root production and turnover
4.2.3 Fine root decomposition
4.2.4 Chemical analysis of roots
4.2.5 Root litter input and C, N, P fluxes in the soil
4.2.6 Data analysis
4.3 Results
4.3.1 Differences in fine root morphology and chemistry between species, and between ingrowth cores and root standing biomass cores
4.3.2 Fine root production and turnover
4.3.3 Fine root decomposition
4.4 Discussion
4.4.1 General considerations
4.4.2 Effect of tree species mixing
4.4.3 Effect of stand density
4.4.4 Effect of irrigation
4.4.5 Implications for carbon and nutrient cycling
4.5 Conclusion