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Table of contents
CHAPTER 1 GENERAL INTRODUCTION
I. CONTEXT OF STUDY
I.1. GLOBAL CARBON CYCLE
I.2. SOIL ORGANIC CARBON
I.3. INTERACTION OF C CYCLE WITH OTHER CYCLES
II. STATE OF THE ART
II.1. INTRODUCTION TO PRIMING EFFECT
II.2. MEASURING PRIMING EFFECT
II.3. WHY PRIMING EFFECT IS IMPORTANT
II.4. KNOWLEDGE GAPS
III. OBJECTIVES OF THESIS
III.1. HYPOTHESES OF THESIS
III.2. APPROACHES OF THE STUDY
IV. THESIS LAYOUT
V. REFERENCES
CHAPTER 2 PLANT CLIPPING DECELERATES THE MINERALIZATION OF RECALCITRANT SOIL ORGANIC MATTER UNDER MULTIPLE GRASSLAND SPECIES
I. SUMMARY
II. INTRODUCTION
III. MATERIALS & METHODS:
III.1. SOIL SAMPLING AND PLANT SOWING
III.2. LABELLING SYSTEM & MESOCOSM
III.3. RESPIRATION MEASUREMENT
III.4. SOIL AND PLANT ANALYSES
III.5. PLFA MEASUREMENTS
III.6. STATISTICAL ANALYSES
IV. RESULTS
IV.1. PLANT BIOMASS AND ISOTOPIC COMPOSITION
IV.2. RESPIRATION FLUXES
IV.3. SOLUBLE C & MINERAL NITROGEN IN SOIL
IV.4. MICROBIAL BIOMASS & COMMUNITY COMPOSITION
V. DISCUSSION
VI. REFERENCES
CHAPTER 3 LIVING ROOTS INDUCE THE MINERALIZATION OF 15, 000 YEARS OLD ORGANIC C FROM DEEP SOIL OF A TEMPERATE GRASSLAND
I. SUMMARY
II. INTRODUCTION
III. MATERIALS & METHODS
III.1. SOIL SAMPLING AND PLANT SOWING
III.2. RESPIRATION MEASURES
III.3. SOIL CARBON FRACTIONS
III.4. SOIL NITROGEN
III.5. PLFA MEASUREMENTS
III.6. STATISTICAL ANALYSES
IV. RESULTS
IV.1. SOM MINERALIZATION & RHIZOSPHERE PRIMING EFFECT
IV.2. MINERAL NITROGEN IN SOIL
IV.3. ROOT LITTER AND SOIL ORGANIC C
IV.4. MICROBIAL BIOMASS & COMMUNITY COMPOSITION
V. DISCUSSION
VI. CONCLUSION
VII. REFERENCES
CHAPTER 4 TEMPERATURE RESPONSE OF ORGANIC C MINERALIZATION: A NEW EXPERIMENTALLY TESTED THEORY BASED ON ENZYME INACTIVATION AND MICROBIAL ENERGY LIMITATION RECONCILES THE RESULTS OF LAB AND ECOSYSTEM EXPERIMENTS
I. SUMMARY
II. INTRODUCTION
III. THEORY
IV. EXPERIMENTAL TEST
V. MATERIALS AND METHODS
V.1. SOIL SAMPLING AND EXPERIMENTAL DESIGN
V.2. LABELLING SYSTEM & MESOCOSM
V.3. RESPIRATION MEASUREMENT
V.4. STATISTICAL ANALYSIS
VI. RESULTS
VI.1. EFFECT OF PLANT ON SOIL RESPIRATION
VI.2. EFFECT OF TEMPERATURE ON FRESH C RESPIRATION
VI.3. TESTING THE THEORY: EFFECT OF TEMPERATURE ON RECALCITRANT C MINERALIZATION IN PLANTED AND BARE SOILS
VII. CONCLUSION
VIII. REFERENCES
CHAPTER 5 ARTICLES IN PREPARATION
PART 1: THE EFFECT OF SIX GRAMINEAE AND ONE LEGUMINOUS SPECIES ON SOIL ORGANIC MATTER DYNAMICS IN TEMPERATE GRASSLAND
PART 2: DOES HIGHER AVAILABILITY OF N DECREASE SOIL ORGANIC C MINERALIZATION AND STORE MORE ORGANIC C?
PART 3: DECOUPLING THE EFFECT OF ROOT EXUDATES, MYCORRHIZAE AND ROOTS ON SOIL C PROCESSES IN THREE TEMPERATE GRASSLAND SPECIES
REFERENCES
CHAPTER 6 ROLE OF PLANT RHIZOSPHERE ACROSS MULTIPLE SPECIES, GRASSLAND MANAGEMENT AND TEMPERATURE ON MICROBIAL COMMUNITIES AND LONG-TERM SOIL ORGANIC MATTER DYNAMICS
I. GENERAL DISCUSSION
II. PERSPECTIVES
III. REFERENCES:
ANNEX OF THE THESIS
ACELLULAR RESPIRATION: RECONSTITUTION OF AN OXIDATIVE
METABOLISM BY ENZYMES RELEASED FROM DEAD CELLS
