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 E. Sala; Inger Kappel Schmidt; Marcelo Sternberg; Katja Tielbörger; Albert Tietema; Ivan A. Janssens

doi:10.1111/gcb.13269

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 E. Sala, Inger Kappel Schmidt, Marcelo SternbergKatja Tielbörger, Albert Tietema, Ivan A. Janssens

LUKKET: Skov, natur og biomasse

68 Citationer (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.

Originalsprog	Engelsk
Tidsskrift	Global Change Biology
Vol/bind	22
Udgave nummer	7
Sider (fra-til)	2570-2581
ISSN	1354-1013
DOI	https://doi.org/10.1111/gcb.13269
Status	Udgivet - 1 jul. 2016

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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., ... 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

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, J-M, Ogaya, R, Ourcival, J-M, Reinsch, S, Sala, OE, 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, bind 22, nr. 7, s. 2570-2581. https://doi.org/10.1111/gcb.13269

@article{bbe7c1fdf61d4292ae4685d4752948e4,

title = "Few multiyear precipitation-reduction experiments find a shift in the productivity-precipitation relationship",

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. ",

author = "Marc Estiarte and Sara Vicca and Josep Pe{\~n}uelas and Michael Bahn and Claus Beier and Emmett, {Bridget A.} and Fay, {Philip A.} and Hanson, {Paul J.} and Roland Hasibeder and Jaime Kigel and Gyorgy Kr{\"o}el-Dulay and Larsen, {Klaus Steenberg} and Eszter Lellei-Kov{\'a}cs and Jean-Marc Limousin and Rom{\`a} Ogaya and Jean-Marc Ourcival and Sabine Reinsch and Sala, {Osvaldo E.} and Schmidt, {Inger Kappel} and Marcelo Sternberg and Katja Tielb{\"o}rger and Albert Tietema and Janssens, {Ivan A.}",

year = "2016",

month = jul,

day = "1",

doi = "10.1111/gcb.13269",

language = "English",

volume = "22",

pages = "2570--2581",

journal = "Global Change Biology",

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T1 - Few multiyear precipitation-reduction experiments find a shift in the productivity-precipitation relationship

AU - Estiarte, Marc

AU - Vicca, Sara

AU - Peñuelas, Josep

AU - Bahn, Michael

AU - Beier, Claus

AU - Emmett, Bridget A.

AU - Fay, Philip A.

AU - Hanson, Paul J.

AU - Hasibeder, Roland

AU - Kigel, Jaime

AU - Kröel-Dulay, Gyorgy

AU - Larsen, Klaus Steenberg

AU - Lellei-Kovács, Eszter

AU - Limousin, Jean-Marc

AU - Ogaya, Romà

AU - Ourcival, Jean-Marc

AU - Reinsch, Sabine

AU - Sala, Osvaldo E.

AU - Schmidt, Inger Kappel

AU - Sternberg, Marcelo

AU - Tielbörger, Katja

AU - Tietema, Albert

AU - Janssens, Ivan A.

PY - 2016/7/1

Y1 - 2016/7/1

N2 - 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.

AB - 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.

U2 - 10.1111/gcb.13269

DO - 10.1111/gcb.13269

M3 - Journal article

C2 - 26946322

SN - 1354-1013

VL - 22

SP - 2570

EP - 2581

JO - Global Change Biology

JF - Global Change Biology

IS - 7

ER -

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

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