Looking deeper into the soil: biophysical controls and seasonal lags of soil CO2production and efflux

• DOI: 10.1890/09-0693.1
• Publication Date: 2010-06-22T04:32:24Z
• Authors: Rodrigo Vargas; Dennis D. Baldocchi; Michael F. Allen; Michael Bahn; T. Andrew Black; Scott L. Collins; Jorge Curiel Yuste; Takashi Hirano; Rachhpal S. Jassal; Jukka Pumpanen; Jianwu Tang
• Keywords: Seasonality; Moderate-resolution imaging spectroradiometer; Terrestrial ecosystem

We seek to understand how biophysical factors such as soil temperature (Ts), moisture (theta), and gross primary production (GPP) influence CO2 fluxes across terrestrial ecosystems. Recent advancements in automated measurements remote-sensing approaches have provided time series which lags relationships among variables can be explored. The purpose of this study is present new applications continuous efflux (F0) concentrations measurements. Here we explore variation Ts, theta, GPP (derived from NASA's moderate-resolution imaging spectroradiometer [MODIS]) F0 (Ps). focused on seasonal used at a daily timescale four vegetation types 13 sites quantify: (1) differences between (2) interactions with GPP. Mean annual Ts did not explain Ps types, but explained 73% 30% the variation, respectively. found evidence that or provide insights into role plant phenology information relevant about possible timing controls autotrophic heterotrophic processes. influences regulate are different dominant variable for explaining fluxes. emergence long-term flux measurement networks provides unique opportunity extended investigations processes near future.