2 - Field measurements of soil respiration: principles and constraints, potentials and limitations of different methods

Summary

INTRODUCTION

Soil respiration is a major component in the carbon balance of terrestrial ecosystems and has been measured in the field for more than eight decades. In this chapter, we will describe the measurement of soil CO₂ efflux at the soil surface that can be considered as equivalent to soil CO₂ production when integrated over long time periods (week, month or season). At shorter time scales the transport of CO₂ may uncouple the soil CO₂ efflux from its production inside the soil. Different methods have been developed to measure this efflux. These methods can affect the object being measured by disturbing the biochemical processes involved in CO₂ production, the physical properties influencing CO₂ movement towards the soil surface, or by changing the environmental conditions in the soil. Therefore, soil respiration measurements in the field are one of the most difficult among the ecosystem flux measurements. So far, no single method has been established as the standard but comparisons, which give important indications on their accuracy, have been performed. The choice of the measurement methodology is not limited to that of a measurement system. The experimenter has to elaborate a protocol depending on the temporal and spatial scales studied. In this chapter, we will describe the most commonly used methodologies for measuring soil CO₂ efflux and present their history, principles and constraints (Section 2.2).