Extracting Information on Rain-Induced Pulses of Ecosystem Respiration across Scales Spanning the Plot, Canopy and Planetary Boundary Layer (Invited)

Details Extracting Information on Rain-Induced Pulses of Ecosystem Respiration across Scales Spanning the Plot, Canopy and Planetary Boundary Layer (Invited) Extracting Information on Rain-Induced Pulses of Ecosystem Respiration across Scales Spanning the Plot, Canopy and Planetary Boundary Layer (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.b24b..01b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #B24B-01

Physics

[0400] Biogeosciences, [0426] Biogeosciences / Biosphere/Atmosphere Interactions, [0428] Biogeosciences / Carbon Cycling, [1843] Hydrology / Land/Atmosphere Interactions

Scientific paper

Semi-arid ecosystems experience huge pulses in respiration, following rain events. Here we characterize the dynamics of these rain-induced pulses by examining field-scale flux measurements from an annual grassland and oak savanna understory that consisted of 50 pulse events collected from over 18 site-years of measurements. We examine this problem in terms of antecedent conditions (e.g. number of prior pulses, exposure to sunlight) and current conditions (amount of rain, amount of dead vegetation). Causative explanations are provided by a set of laboratory and field manipulation studies on litter samples that were exposed to different levels of rain and sunlight--our working hypothesis is that the magnitude of the respiration pulse is modulated by differing degrees of photodegradation. To understand the regional extent of the pulses, we interpret time courses in CO2 concentration with a planetary boundary layer box model. The magnitude of the rain-induced respiration pulses is a function of the exposure of litter to sunlight, so greater pulses emanate from an open grassland than the understory of a savanna. These pulses can result in CO2 effluxes that approach 8 gC m-2 d-1, and these effluxes remain elevated, above background, for up to 20 days. We find that the pulses are regional in nature because they can cause a sudden jump in CO2 in the well-mixed planetary boundary layer of over 30 ppm.

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