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Spatial variability and temporal trends in water‐use efficiency of European forests

pmid: 25156251
Spatial variability and temporal trends in water‐use efficiency of European forests
AbstractThe increasing carbon dioxide (CO2) concentration in the atmosphere in combination with climatic changes throughout the last century are likely to have had a profound effect on the physiology of trees: altering the carbon and water fluxes passing through the stomatal pores. However, the magnitude and spatial patterns of such changes in natural forests remain highly uncertain. Here, stable carbon isotope ratios from a network of 35 tree‐ring sites located across Europe are investigated to determine the intrinsic water‐use efficiency (iWUE), the ratio of photosynthesis to stomatal conductance from 1901 to 2000. The results were compared with simulations of a dynamic vegetation model (LPX‐Bern 1.0) that integrates numerous ecosystem and land–atmosphere exchange processes in a theoretical framework. The spatial pattern of tree‐ring derived iWUE of the investigated coniferous and deciduous species and the model results agreed significantly with a clear south‐to‐north gradient, as well as a general increase in iWUE over the 20th century. The magnitude of the iWUE increase was not spatially uniform, with the strongest increase observed and modelled for temperate forests in Central Europe, a region where summer soil‐water availability decreased over the last century. We were able to demonstrate that the combined effects of increasing CO2 and climate change leading to soil drying have resulted in an accelerated increase in iWUE. These findings will help to reduce uncertainties in the land surface schemes of global climate models, where vegetation–climate feedbacks are currently still poorly constrained by observational data.
- French National Centre for Scientific Research France
- University of Helsinki Finland
- American Museum of Natural History United States
- Paul Scherrer Institute Switzerland
- Technical University of Munich Germany
Dendrochronology, Time Factors, 550, Climate Change, ta1171, Forests, Carbon Cycle, Trees, Water Cycle, Environmental Science(all), Canvi climàtic, Environmental Chemistry, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Dendrocronologia, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Climatology, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Carbon Isotopes, Global and Planetary Change, Boscos, Geography, Ecology, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, Climatic changes, Carbon Dioxide, Models, Theoretical, ta4112, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment, Climatic change, Europe, Climatologia, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, Europa, environment, Canvis climàtics
Dendrochronology, Time Factors, 550, Climate Change, ta1171, Forests, Carbon Cycle, Trees, Water Cycle, Environmental Science(all), Canvi climàtic, Environmental Chemistry, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Dendrocronologia, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Climatology, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Carbon Isotopes, Global and Planetary Change, Boscos, Geography, Ecology, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, Climatic changes, Carbon Dioxide, Models, Theoretical, ta4112, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment, Climatic change, Europe, Climatologia, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, Europa, environment, Canvis climàtics
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citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).183 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 1% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Top 10% impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 1% visibility views 69 download downloads 299 - 69views299downloads
Data source Views Downloads Diposit Digital de la Universitat de Barcelona 69 299


