How do variations in the temporal distribution of rainfall events affect ecosystem fluxes in seasonally water-limited Northern Hemisphere shrublands and forests?

被引：40

作者：

Ross, I. ^{[1
]}

Misson, L. ^{[1
]}

Rambal, S. ^{[1
]}

Arneth, A. ^{[2
,3
]}

Scott, R. L. ^{[4
]}

Carrara, A. ^{[5
]}

Cescatti, A. ^{[6
]}

Genesio, L. ^{[7
]}

机构：

[1] CEFE CNRS, F-34000 Montpellier, France

[2] Lund Univ, Dept Earth & Ecosyst Sci, S-22100 Lund, Sweden

[3] Karlsruhe Inst Technol, Inst Meteorol & Climate Res Atmospher Environm Re, Garmisch Partenkirchen, Germany

[4] ARS, USDA, SW Watershed Res Ctr, Tucson, AZ 85719 USA

[5] Fdn CEAM, Paterna 46980, Spain

[6] Commiss European Communities, Joint Res Ctr, Inst Environm & Sustainabil, I-21020 Ispra, Italy

[7] Natl Res Council CNR, Inst Biometeorol IBIMET, I-51045 Florence, Italy

来源：

BIOGEOSCIENCES | 2012年 / 9卷 / 03期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

CARBON-DIOXIDE EXCHANGE; SOIL CO2 FLUX; PRECIPITATION PULSES; HYDROLOGIC PROCESSES; CLIMATE-CHANGE; ACTIVE-ROLE; MEDITERRANEAN ECOSYSTEMS; TERRESTRIAL ECOSYSTEMS; USE STRATEGIES; GAS-EXCHANGE;

D O I：

10.5194/bg-9-1007-2012

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

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 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 water-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 rainfall distributions characterised by fewer and larger rainfall events have significantly lower gross primary productivity, slightly lower ecosystem respiration and consequently a smaller net ecosystem productivity.

引用

页码：1007 / 1024

页数：18