10.5061/DRYAD.5242J
Hanan, Erin J.
Washington State University
University of California, Santa Barbara
Tague, Christina Naomi
University of California, Santa Barbara
Schimel, Joshua P.
University of California, Santa Barbara
Data from: Nitrogen cycling and export in California chaparral: the role
of climate in shaping ecosystem responses to fire
Dryad
dataset
2016
chaparral
mineralization
ecohydrology modeling
wildfire
Nitrification
RHESSys
Mediterranean-type ecosystems
leaching
semi-arid
mechanistic model
plant-soil-water interactions
National Science Foundation
https://ror.org/021nxhr62
DEB-0952599
2016-09-23T14:53:31Z
2016-09-23T14:53:31Z
en
https://doi.org/10.1002/ecm.1234
80770188 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Climate change models predict that interannual rainfall variability will
increase in California over the next several decades; these changes will
likely influence how frequently California ecosystems burn and how they
respond to fire. Fires uncouple N mobilization from uptake by destroying
plant biomass and increasing nitrification. Following fire, autumn and
winter rains can leach N into streams from slopes that have been denuded.
The amount of N exported depends on how rapidly soil microbes metabolize
it into mobile forms such as NO3-, and the rate that recovering plants
take up available N. However, the long-term effects of a changing climate
on postfire N dynamics remain unknown. We used the ecohydrologic model
RHESSys (regional hydro-ecologic simulation system) to evaluate how
interannual climate variability may affect the magnitude of N
mineralization, nitrification, N export, and plant recovery following
fire. N export was highest when fire was followed by drought; even though
there was less water moving through the system, dry conditions prolonged
the period during which N mobilization was decoupled from plant uptake. We
also found that the effects of drought on N export were magnified in
stands dominated by obligate seeders, which initially recovered more
slowly than resprouters. These findings suggest that climate may regulate
N balance most powerfully by influencing how quickly plants “turn on” and
begin to immobilize N.
Model version and URLModelSettings.rtfInputs, settings, and state
variables for RHESSys simulationsThis includes all files necessary to run
RHESSys simulations with the file structure already set up.hanan2016.tar
Southern California