Publication Date:
2022-05-25
Description:
Author Posting. © Ecological Society of America, 2010. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 20 (2010): 1569–1582, doi:10.1890/09-0693.1.
Description:
We seek to understand how biophysical factors such as soil temperature (Ts), soil moisture (θ), and gross primary production (GPP) influence CO2 fluxes across terrestrial ecosystems. Recent advancements in automated measurements and remote-sensing approaches have provided time series in which lags and relationships among variables can be explored. The purpose of this study is to present new applications of continuous measurements of soil CO2 efflux (F0) and soil CO2 concentrations measurements. Here we explore how variation in Ts, θ, and GPP (derived from NASA's moderate-resolution imaging spectroradiometer [MODIS]) influence F0 and soil CO2 production (Ps). We focused on seasonal variation and used continuous measurements at a daily timescale across four vegetation types at 13 study sites to quantify: (1) differences in seasonal lags between soil CO2 fluxes and Ts, θ, and GPP and (2) interactions and relationships between CO2 fluxes with Ts, θ, and GPP. Mean annual Ts did not explain annual F0 and Ps among vegetation types, but GPP explained 73% and 30% of the variation, respectively. We found evidence that lags between soil CO2 fluxes and Ts or GPP provide insights into the role of plant phenology and information relevant about possible timing of controls of autotrophic and heterotrophic processes. The influences of biophysical factors that regulate daily F0 and Ps are different among vegetation types, but GPP is a dominant variable for explaining soil CO2 fluxes. The emergence of long-term automated soil CO2 flux measurement networks provides a unique opportunity for extended investigations into F0 and Ps processes in the near future.
Description:
Data collection was possible thanks to NASA,
the NSF Center for Embedded Networked Sensing
(CCR-0120778), DOE (DE-FG02-03ER63638), CONACyT,
UCMEXUS, NSF (EF-0410408), NSF-LTER, KAKENHI
(12878089 and 13480150), the Academy of Finland (213093),
the Austrian Science Fund (FWF, P18756-B16), the Kearney
Foundation, the Canadian Foundation for Climate and
Atmospheric Sciences (CFCAS), and the Natural Science and
Engineering Research Council of Canada (NSERC). R. Vargas
was supported by grant DEB-0639235 during the preparation
of this manuscript.
Keywords:
Lags
;
Moderate-resolution imaging spectroradiometer (MODIS)
;
Photosynthesis
;
Soil CO2 efflux
;
Soil CO2 production
;
Soil CO2 sensors
;
Soil respiration
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
application/pdf
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