Whole-system responses of experimental plant communities to climate extremes imposed in different seasons

被引：230

作者：

De Boeck, Hans J. ^{[1
]}

Dreesen, Freja E. ^{[1
]}

Janssens, Ivan A. ^{[1
]}

Nijs, Ivan ^{[1
,2
]}

机构：

[1] Univ Antwerp, Res Grp Plant & Vegetat Ecol, Dept Biol, B-2610 Antwerp, Belgium

[2] King Saud Univ, Riyadh, Saudi Arabia

来源：

NEW PHYTOLOGIST | 2011年 / 189卷 / 03期

关键词：

climate; CO2; fluxes; drought; extreme events; heat wave; plants; seasonality; SPECIES RICHNESS; INFRARED HEATER; TREE MORTALITY; CARBON BALANCE; CO2; FLUXES; ECOSYSTEM; DROUGHT; TEMPERATURE; EVENTS; PRODUCTIVITY;

D O I：

10.1111/j.1469-8137.2010.03515.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Discrete climate events such as heat waves and droughts can have a disproportionate impact on ecosystems relative to the temporal scale over which they occur. Research oriented towards (extreme) events rather than (gradual) trends is therefore urgently needed. Here, we imposed heat waves and droughts (50-yr return time) in a full factorial design on experimental plant communities in spring, summer or autumn. Droughts were created by removing the controlled water table (rainout shelters prevented precipitation), while heat waves were imposed with infrared heaters. Measurements of whole-system CO2 exchange, growth and biomass production revealed multiple interactions between treatments and the season in which they occurred. Heat waves had only small and transient effects, with infrared imaging showing little heat stress because of transpirational cooling. If heat waves were combined with drought, negative effects observed in single factor drought treatments were exacerbated through intensified soil drying, and heat stress in summer. Plant recovery from stress differed, affecting the biomass yield. In conclusion, the timing of extreme events is critical regarding their impact, and synergisms between heat waves and drought aggravate the negative effects of these extremes on plant growth and functioning.

引用

页码：806 / 817

页数：12

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