Title: How do variations in the temporal distribution of rainfall events affect ecosystem fluxes in seasonally water-limited Northern Hemisphere shrublands and forests?
Authors: ROSS I.MISSON LaurentRAMBAL S.ARNETH A.SCOTT R.CARRARA ArnaudCESCATTI AlessandroGENESIO Lorenzo
Citation: BIOGEOSCIENCES vol. 9 no. 1007–1024
Publisher: COPERNICUS GESELLSCHAFT MBH
Publication Year: 2011
JRC N°: JRC68611
ISSN: 1726-4170
URI: http://www.biogeosciences.net/9/1007/2012/bg-9-1007-2012.html
http://publications.jrc.ec.europa.eu/repository/handle/JRC68611
DOI: 10.5194/bg-9-1007-2012
Type: Articles in periodicals and books
Abstract: As a result of climate change, rainfall regimes became more extreme over the course of the 20th century, characterised by fewer and larger rainfall events. Such changes are expected to continue throughout the current century. The effect of changes in the 5 temporal distribution of rainfall on ecosystem carbon fluxes is poorly understood, with most available information coming from experimental studies of grassland ecosystems. Here, continuous measurements of ecosystem carbon fluxes and precipitation from the worldwide FLUXNET network of eddy-covariance sites are exploited to investigate the effects of differences in rainfall distribution on the carbon balance of seasonally water10 limited shrubland and forest sites. Once the strong dependence of ecosystem fluxes on total annual rainfall amount is accounted for, results show that sites with more extreme rainfall distributions have significantly lower gross productivity, slightly lower ecosystem respiration and consequently a smaller net ecosystem productivity.
JRC Directorate:Sustainable Resources

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