NDLI: Separating the effects of moisture and temperature on soil CO2 efflux in a coniferous forest in the Sierra Nevada mountains

Content Provider	Springer Nature Link
Author	Qi, Ye Xu, Ming
Copyright Year	2001
Abstract	Separating the effects of soil temperature and moisture on soil CO$_{2}$ efflux is critical to modeling and understanding the belowground carbon dynamics of forest ecosystems. We developed two analytical procedures to separate the effects of soil temperature and moisture, based on continuous measurements of the CO$_{2}$ efflux, temperature and moisture of the soil at a ponderosa pine plantation in the Sierra Nevada Mountains in California, from May 1998 to August 1999. We found that the combined effects of temperature and moisture on the seasonal variation of soil CO$_{2}$ efflux could be effectively separated and represented with the product of a temperature term and a moisture term. The relationship between soil CO$_{2}$ efflux and temperature could be well described using a power function. This relationship was modified by soil moisture which affects only the coefficient, but not the exponent, of the power function. We also found that when soil moisture was held constant, the temperature effect explained 82% of the temporal variation in CO$_{2}$ efflux of the soil. Similarly, when temperature was held constant, the moisture effects explained 84% of the variation. Temperature and moisture together explained 89% of the total temporal variations in soil CO$_{2}$ efflux. A multiplicative formulation with power functions representing both temperature and moisture dependences was recommended for modeling soil CO$_{2}$ efflux. This formulation can be used to model the seasonal trend of soil CO$_{2}$ efflux of the forest based on temperature and moisture, two key variables influenced by climate change and management practices.
Starting Page	15
Ending Page	23
Page Count	9
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	237
Issue Number	1
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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