globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13269
论文题名:
Few multiyear precipitation–reduction experiments find a shift in the productivity–precipitation relationship
作者: Estiarte M.; Vicca S.; Peñuelas J.; Bahn M.; Beier C.; Emmett B.A.; Fay P.A.; Hanson P.J.; Hasibeder R.; Kigel J.; Kröel-Dulay G.; Larsen K.S.; Lellei-Kovács E.; Limousin J.-M.; Ogaya R.; Ourcival J.-M.; Reinsch S.; Sala O.E.; Schmidt I.K.; Sternberg M.; Tielbörger K.; Tietema A.; Janssens I.A.
刊名: Global Change Biology
出版年: 2016
卷: 22, 期:7
起始页码: 2570
结束页码: 2581
语种: 英语
英文关键词: aboveground productivity ; drought ; precipitation ; precipitation–reduction experiments ; spatial fit ; temporal fit
Scopus关键词: aboveground production ; drought ; precipitation (climatology) ; spatial analysis ; temporal analysis
英文摘要: Well-defined productivity–precipitation relationships of ecosystems are needed as benchmarks for the validation of land models used for future projections. The productivity–precipitation relationship may be studied in two ways: the spatial approach relates differences in productivity to those in precipitation among sites along a precipitation gradient (the spatial fit, with a steeper slope); the temporal approach relates interannual productivity changes to variation in precipitation within sites (the temporal fits, with flatter slopes). Precipitation–reduction experiments in natural ecosystems represent a complement to the fits, because they can reduce precipitation below the natural range and are thus well suited to study potential effects of climate drying. Here, we analyse the effects of dry treatments in eleven multiyear precipitation–manipulation experiments, focusing on changes in the temporal fit. We expected that structural changes in the dry treatments would occur in some experiments, thereby reducing the intercept of the temporal fit and displacing the productivity–precipitation relationship downward the spatial fit. The majority of experiments (72%) showed that dry treatments did not alter the temporal fit. This implies that current temporal fits are to be preferred over the spatial fit to benchmark land-model projections of productivity under future climate within the precipitation ranges covered by the experiments. Moreover, in two experiments, the intercept of the temporal fit unexpectedly increased due to mechanisms that reduced either water loss or nutrient loss. The expected decrease of the intercept was observed in only one experiment, and only when distinguishing between the late and the early phases of the experiment. This implies that we currently do not know at which precipitation–reduction level or at which experimental duration structural changes will start to alter ecosystem productivity. Our study highlights the need for experiments with multiple, including more extreme, dry treatments, to identify the precipitation boundaries within which the current temporal fits remain valid. © 2016 John Wiley & Sons Ltd
资助项目: Estiarte, M. ; Global Ecology Unit CREAF-CSIC-UAB, CSICSpain ; 电子邮件: m.estiarte@creaf.uab.cat
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61371
Appears in Collections:影响、适应和脆弱性

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作者单位: Global Ecology Unit CREAF-CSIC-UAB, CSIC, Cerdanyola del Vallès, Catalonia, Spain; CREAF, Cerdanyola del Vallès, Barcelona, Catalonia, Spain; Department of Biology, University of Antwerp, Wilrijk, Belgium; Institute of Ecology, University of Innsbruck, Sternwarte str. 15, Innsbruck, Austria; Department of Geoscience and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, Frederiksberg C, Denmark; NIVA, Center for Catchments and Urban Water Research, Oslo, Norway; Center for Ecology and Hydrology, Environment Centre Wales, Bangor, Gwynedd, United Kingdom; USDA-ARS, 808 E Blackland Rd, Temple, TX, United States; Oak Ridge National Laboratory, Climate Change Science Institute, Oak Ridge, TN, United States; Institute for Plant Sciences and Genetics, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel; Institute of Ecology and Botany, MTA Centre for Ecological Research, Vacratot, Hungary; Centre d'Ecologie Fonctionnelle et Evolutive CEFE, UMR5175, CNRS, Université de Montpellier, Université Paul-Valéry Montpellier, EPHE, 1919 Route de Mende, Montpellier, Cedex 5, France; School of Life Sciences and School of Sustainability, Arizona State University, Tempe, AZ, United States; Department of Molecular Biology & Ecology of Plants, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel; Department of Biology, Plant Ecology Group, University of Tübingen, Auf der Morgenstelle 3, Tübingen, Germany; Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, PO Box 94240, Amsterdam, Netherlands

Recommended Citation:
Estiarte M.,Vicca S.,Peñuelas J.,et al. Few multiyear precipitation–reduction experiments find a shift in the productivity–precipitation relationship[J]. Global Change Biology,2016-01-01,22(7)
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