The CO2 efflux (Fsoil)

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Table of contents

Chapter 1: General Introduction
1.1. Global Carbon cycle
1.2. Scientific Context of the Thesis: DEEPSURF Project
1.3. Aims of the thesis
1.4. Chapters Structure
1.5. CO2 and CH4 Dynamic in Critical Zone
1.5.1. Humidity
1.5.2. Temperature
1.5.3. Soil pH Values
1.5.4. Nutrients
1.5.5. Exposure and Air Pressure
1.5.6. Land Use Changes
1.5.7. Stand and Plant types
1.5.8. Hydrobiogeochemical Processes
1.5.9. Measurement methods for gas exchange
Chapter 2: Metrology
Resume
Abstract
2.1. Fundamental and Instrumental Generalities: Application to Gas Studies
2.1.1. FTIR Spectroscopy (FTIRS)
2.1.2. Cavity Ring-Down Spectroscopy (CRDS)
2.1.3. Gas Chromatography (GC)
2.2. Laboratory Gases Analysis
2.2.1. Gas Analyzers and Gas standard Preparation
2.2.2. Calibration Strategy
2.3. Results
2.3.1. Calibration results of CO2 and CH4
2.3.2. Cross-Validation
2.4. Intermediate Conclusion
Chapter 3: Subsoil CO2 and Micrometeorological Monitoring
Resume
Abstract
3.1. Introduction
3.2. Materials and Methods
3.2.1. Study site description
3.2.2. In-situ Subsoil Gases and Auxiliaries Data Measurements
3.2.3. Micrometeorological Measurement
3.2.4. Principal Component and Wavelet Analysis
3.2.5. In-situ Subsoil Gases Measurement
3.2.6. Seasonal, Daily, and Hourly Variations
3.3. Discussion
3.3.1. CO2 molar fraction dynamics
3.3.2. Analysis of Wind Turbulence and Soil moisture Content
3.3.3. Analysis of Pressure pumping Effect due to Wind Turbulence
3.4. Conclusion
Chapter 4: Long-Term Eddy Covariance Analysis
Resume
Abstract
4.1. Introduction
4.2. Materials and Methods
4.2.1. The Fundamental of Eddy Covariance Technique
4.2.2. Instrumentation and Measurements
4.2.3. Data Processing
4.2.4. The flux footprint
4.2.5. Drought Index and Vegetation State
4.3. Results
4.3.1. Seasonal variations in environmental variables
4.3.2. Variations of Carbon Exchange
4.3.3. Vegetation State
4.3.4. Thinning and Fluxes
4.4. Discussion
4.4.1. Soil and atmospheric dryness across the years
4.4.2. Ecosystem Respiration Responses
4.4.3. Gross Primary Productivity Response
4.5. Intermediate Conclusion
Chapter 5: Subsoil Gases and Eddy Covariance Analysis
Resume
Abstract
5.1. Introduction
5.2. Materials and Methods
5.2.1. CO2 storage calculation
5.2.2. Ecosystem Respiration and Flux Footprint
5.2.3. Soil Gases Sampling and Analysis
5.3. Results
5.3.1. Ecosystem Respiration, CO2 Storage, and Environmental Driver Dynamics
5.3.2. Isotopic Composition
5.3.3. Relationship between soil CO2 and other gas compositions
5.4. Discussion
5.4.1. Change in Soil CO2 storage Due to Subsoil Ventilation
5.4.2. Controlling Processes on Subsoil CO2 in Temperate Forest
5.5. Conclusion
Chapter 6: General Discussion and Conclusion
References
Annex
7.1 Installation of Borehole Instrument
7.2. Percentage of filtered and missing data from flux tower
7.3. Half-hourly Measurement of Borehole and Flux Tower Data (2019-2020)