Few multiyear precipitation–reduction experiments find a shift in the productivity–precipitation relationship

Marc Estiarte, Sara Vicca, Josep Peñuelas, Michael Bahn, Claus Beier, Bridget A. Emmett, Philip A. Fay, Paul J. Hanson, Roland Hasibeder, Jaime Kigel, Gyorgy Kröel-Dulay, Klaus Steenberg Larsen, Eszter Lellei-Kovács, Jean Marc Limousin, Romà Ogaya, Jean Marc Ourcival, Sabine Reinsch, Osvaldo Sala, Inger Kappel Schmidt, Marcelo Sternberg & 3 others Katja Tielbörger, Albert Tietema, Ivan A. Janssens

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)2570-2581
Number of pages12
JournalGlobal Change Biology
Volume22
Issue number7
DOIs
StatePublished - Jul 1 2016

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experiment
Experiments
Productivity
Ecosystems
productivity
structural change
ecosystem
nutrient loss
climate
Nutrients
Drying
Water
water
land
effect

Keywords

  • aboveground productivity
  • drought
  • precipitation
  • precipitation–reduction experiments
  • spatial fit
  • temporal fit

ASJC Scopus subject areas

  • Ecology
  • Global and Planetary Change
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Estiarte, M., Vicca, S., Peñuelas, J., Bahn, M., Beier, C., Emmett, B. A., ... Janssens, I. A. (2016). Few multiyear precipitation–reduction experiments find a shift in the productivity–precipitation relationship. Global Change Biology, 22(7), 2570-2581. https://doi.org/10.1111/gcb.13269

Few multiyear precipitation–reduction experiments find a shift in the productivity–precipitation relationship. / Estiarte, Marc; Vicca, Sara; Peñuelas, Josep; Bahn, Michael; Beier, Claus; Emmett, Bridget A.; Fay, Philip A.; Hanson, Paul J.; Hasibeder, Roland; Kigel, Jaime; Kröel-Dulay, Gyorgy; Larsen, Klaus Steenberg; Lellei-Kovács, Eszter; Limousin, Jean Marc; Ogaya, Romà; Ourcival, Jean Marc; Reinsch, Sabine; Sala, Osvaldo; Schmidt, Inger Kappel; Sternberg, Marcelo; Tielbörger, Katja; Tietema, Albert; Janssens, Ivan A.

In: Global Change Biology, Vol. 22, No. 7, 01.07.2016, p. 2570-2581.

Research output: Contribution to journalArticle

Estiarte, M, Vicca, S, Peñuelas, J, Bahn, M, Beier, C, Emmett, BA, Fay, PA, Hanson, PJ, Hasibeder, R, Kigel, J, Kröel-Dulay, G, Larsen, KS, Lellei-Kovács, E, Limousin, JM, Ogaya, R, Ourcival, JM, Reinsch, S, Sala, O, Schmidt, IK, Sternberg, M, Tielbörger, K, Tietema, A & Janssens, IA 2016, 'Few multiyear precipitation–reduction experiments find a shift in the productivity–precipitation relationship', Global Change Biology, vol. 22, no. 7, pp. 2570-2581. https://doi.org/10.1111/gcb.13269
Estiarte, Marc ; Vicca, Sara ; Peñuelas, Josep ; Bahn, Michael ; Beier, Claus ; Emmett, Bridget A. ; Fay, Philip A. ; Hanson, Paul J. ; Hasibeder, Roland ; Kigel, Jaime ; Kröel-Dulay, Gyorgy ; Larsen, Klaus Steenberg ; Lellei-Kovács, Eszter ; Limousin, Jean Marc ; Ogaya, Romà ; Ourcival, Jean Marc ; Reinsch, Sabine ; Sala, Osvaldo ; Schmidt, Inger Kappel ; Sternberg, Marcelo ; Tielbörger, Katja ; Tietema, Albert ; Janssens, Ivan A. / Few multiyear precipitation–reduction experiments find a shift in the productivity–precipitation relationship. In: Global Change Biology. 2016 ; Vol. 22, No. 7. pp. 2570-2581.
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