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	Jordfuktkurva	Mätning av markrespiration
Ämnesområde	Agronomi	Agronomi
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1956-1980	Mid-20th century (chamber methods formalised ~1950s–1970s; automated systems ~1990s)
Upphovsperson	Willard Robert Gardner, Rollin H. Brooks, Arthur T. Corey	Multiple contributors
Typ	Empirical soil water retention model	Field measurement technique
Ursprungskälla	Gardner, W. R. (1956). Representation of soil aggregate-size distribution by a logarithmic-normal distribution. Soil Science Society of America Journal, 20(2), 151-153.	Hanson, P. J., Edwards, N. T., Garten, C. T., & Andrews, J. A. (2000). Separating root and soil microbial contributions to soil respiration: A review of methods and observations. Biogeochemistry, 48(1), 115–146.
Alias	Water Retention Curve, pF Curve, Characteristic Curve, SWRC	soil CO2 efflux measurement, soil carbon flux measurement, belowground respiration measurement, soil surface CO2 flux measurement
Närliggande	3	1
Sammanfattning	The soil moisture curve (or soil water retention curve, SWRC) describes the relationship between soil water content and soil matric potential (water tension). It characterizes how tightly water is bound in pores of different sizes: large pores drain at low tensions (wet soils), while smaller pores retain water at high tensions (dry soils). Quantifying this relationship is essential for water balance modeling, unsaturated flow prediction, and assessing plant-available water.	Soil respiration measurement quantifies the rate at which CO2 is released from the soil surface to the atmosphere, integrating contributions from root respiration and microbial decomposition of organic matter. It is a fundamental technique in agronomy, ecology, and climate science, providing insight into belowground carbon cycling, soil biological activity, and ecosystem carbon balance. Measurements are typically made using static or dynamic chambers placed on the soil surface.