Contrasting response of grassland versus forest carbon and water fluxes to spring drought in Switzerland

被引：129

作者：

Wolf, Sebastian ^{[1
,2
]}

Eugster, Werner ^{[2
]}

Ammann, Christof ^{[3
]}

Haeni, Matthias ^{[2
]}

Zielis, Sebastian ^{[2
]}

Hiller, Rebecca ^{[4
]}

Stieger, Jacqueline ^{[2
]}

Imer, Dennis ^{[2
]}

Merbold, Lutz ^{[2
]}

Buchmann, Nina ^{[2
]}

机构：

[1] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA

[2] Swiss Fed Inst Technol, Inst Agr Sci, CH-8092 Zurich, Switzerland

[3] Res Stn Agroscope Reckenholz Tanikon ART, CH-8046 Zurich, Switzerland

[4] Swiss Fed Labs Mat Sci & Technol EMPA, CH-8600 Dubendorf, Switzerland

来源：

ENVIRONMENTAL RESEARCH LETTERS | 2013年 / 8卷 / 03期

基金：

瑞士国家科学基金会;

关键词：

Swiss FluxNet; drought response; eddy covariance; carbon dioxide fluxes; water vapour fluxes; water deficit; evapotranspiration; water-use efficiency; NET ECOSYSTEM PRODUCTIVITY; EUROPE-WIDE REDUCTION; EDDY-COVARIANCE; SUMMER; EXCHANGE; BUDGET; HEAT; SEQUESTRATION; VARIABILITY; DYNAMICS;

D O I：

10.1088/1748-9326/8/3/035007

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Since the European summer heat wave of 2003, considerable attention has been paid to the impacts of exceptional weather events on terrestrial ecosystems. While our understanding of the effects of summer drought on ecosystem carbon and water vapour fluxes has recently advanced, the effects of spring drought remain unclear. In Switzerland, spring 2011 (March-May) was the warmest and among the driest since the beginning of meteorological measurements. This study synthesizes Swiss FluxNet data from three grassland and two forest ecosystems to investigate the effects of this spring drought. Across all sites, spring phenological development was 11 days earlier in 2011 compared to the mean of 2000-2011. Soil moisture related reductions of gross primary productivity (GPP) were found at the lowland grassland sites, where productivity did not recover following grass cuts. In contrast, spring GPP was enhanced at the montane grassland and both forests (mixed deciduous and evergreen). Evapotranspiration (ET) was reduced in forests, which also substantially increased their water-use efficiency (WUE) during spring drought, but not in grasslands. These contrasting responses to spring drought of grasslands compared to forests reflect different adaptive strategies between vegetation types, highly relevant to biosphere-atmosphere feedbacks in the climate system.

引用

页数：12

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