期刊
ECOLOGICAL MONOGRAPHS
卷 87, 期 1, 页码 76-90出版社
WILEY
DOI: 10.1002/ecm.1234
关键词
chaparral; climate change; ecohydrology modeling; leaching; mechanistic model; Mediterranean-type ecosystems; mineralization; nitrification; plant-soil-water interactions; regional hydro-ecologic simulation system; semiarid; wildfire
类别
资金
- National Science Foundation RAPID Grant [DEB-0952599]
- Santa Barbara Coastal Long-Term Ecological Research project [OCE-0620276, OCE-1232779]
- Integrated Network for Terrestrial Ecosystem Research on Feedbacks to the Atmosphere and ClimatE (INTERFACE)
- Division Of Ocean Sciences
- Directorate For Geosciences [1232779] Funding Source: National Science Foundation
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.
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