globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12785
论文题名:
The combined effects of a long-term experimental drought and an extreme drought on the use of plant-water sources in a Mediterranean forest
作者: Barbeta A.; Mejía-Chang M.; Ogaya R.; Voltas J.; Dawson T.E.; Peñuelas J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期:3
起始页码: 1213
结束页码: 1225
语种: 英语
英文关键词: Phillyrea latifolia ; Quercus ilex ; Arbutus unedo ; Climate change ; Experimental drought ; Extreme drought ; Holm oak ; Mediterranean forest ; Stable isotopes ; Water uptake ; Water-use strategies
Scopus关键词: climate change ; drought ; evergreen tree ; extreme event ; forest ecosystem ; groundwater ; Mediterranean environment ; transpiration ; water uptake ; Arbutus unedo ; Phillyrea latifolia ; Quercus ilex ; water ; drought ; growth, development and aging ; hydrology ; longevity ; metabolism ; physiology ; season ; Spain ; species difference ; tree ; Droughts ; Hydrology ; Longevity ; Seasons ; Spain ; Species Specificity ; Trees ; Water
英文摘要: Vegetation in water-limited ecosystems relies strongly on access to deep water reserves to withstand dry periods. Most of these ecosystems have shallow soils over deep groundwater reserves. Understanding the functioning and functional plasticity of species-specific root systems and the patterns of or differences in the use of water sources under more frequent or intense droughts is therefore necessary to properly predict the responses of seasonally dry ecosystems to future climate. We used stable isotopes to investigate the seasonal patterns of water uptake by a sclerophyll forest on sloped terrain with shallow soils. We assessed the effect of a long-term experimental drought (12 years) and the added impact of an extreme natural drought that produced widespread tree mortality and crown defoliation. The dominant species, Quercus ilex, Arbutus unedo and Phillyrea latifolia, all have dimorphic root systems enabling them to access different water sources in space and time. The plants extracted water mainly from the soil in the cold and wet seasons but increased their use of groundwater during the summer drought. Interestingly, the plants subjected to the long-term experimental drought shifted water uptake toward deeper (10-35 cm) soil layers during the wet season and reduced groundwater uptake in summer, indicating plasticity in the functional distribution of fine roots that dampened the effect of our experimental drought over the long term. An extreme drought in 2011, however, further reduced the contribution of deep soil layers and groundwater to transpiration, which resulted in greater crown defoliation in the drought-affected plants. This study suggests that extreme droughts aggravate moderate but persistent drier conditions (simulated by our manipulation) and may lead to the depletion of water from groundwater reservoirs and weathered bedrock, threatening the preservation of these Mediterranean ecosystems in their current structures and compositions. © 2014 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61667
Appears in Collections:影响、适应和脆弱性

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作者单位: CSIC, Global Ecology Unit CREAF-CSIC-UAB, Cerdanyola del Vallès (Catalonia), Spain; CREAF, Cerdanyola del Vallès (Catalonia), Spain; Department of Crop and Forest Sciences - AGROTECNIO Center, University of Lleida, Lleida, Catalunya, Spain; Department of Integrative Biology, University of California at Berkeley, Berkeley, CA, United States

Recommended Citation:
Barbeta A.,Mejía-Chang M.,Ogaya R.,et al. The combined effects of a long-term experimental drought and an extreme drought on the use of plant-water sources in a Mediterranean forest[J]. Global Change Biology,2015-01-01,21(3)
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