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Shifting Impacts of Climate Change: Long-Term Patterns of Plant Response to Elevated CO2, Drought, and Warming Across Ecosystems

Chapter in book
Authors Louise C. Andresen
Christoph Müller
Giovanbattista de Dato
Jeffrey S Dukes
Bridget A Emmett
Marc Estiarte
Anke Jentsch
György Kröel-Dulay
Lüscher Andreas
Shuli Niu
Josep Peñuelas
Peter B Reich
Sabine Reinsch
Roma Ogaya
Inger K Schmidt
Manuel K Schneider
Marcelo Sternberg
Albert Tietema
Kai Zhu
Mark C Bilton
Published in Large-Scale Ecology: Model Systems to Global Perspectives
Pages 437–473
ISBN 978-0-08-100935-2
Publisher Elsevier
Publication year 2016
Published at Department of Earth Sciences
Pages 437–473
Language en
Links dx.doi.org/10.1016/bs.aecr.2016.07....
Subject categories Terrestrial ecology, Climate Research

Abstract

Field experiments that expose terrestrial ecosystems to climate change factors by manipulations are expensive to maintain, and typically only last a few years. Plant biomass is commonly used to assess responses to climate treatments and to predict climate change impacts. However, response to the treatments might be considerably different between the early years and a decade later. The aim of this data analysis was to develop and apply a method for evaluating changes in plant biomass responses through time, in order to provide a firm basis for discussing how the ‘short-term’ response might differ from the ‘long-term’ response. Across 22 sites situated in the northern hemisphere, which covered three continents, and multiple ecosystems (grasslands, shrublands, moorlands, forests, and deserts), we evaluated biomass datasets from long-term experiments with exposure to elevated CO2 (eCO2), warming, or drought. We developed methods for assessing biomass response patterns to the manipulations using polynomial and linear (piecewise) model analysis and linked the responses to sitespecific variables such as temperature and rainfall. Polynomial patterns across sites indicated changes in response direction over time under eCO2, warming, and drought. In addition, five distinct pattern types were confirmed within sites: ‘no response’, ‘delayed response’, ‘directional response’, ‘dampening response’, and ‘altered response’ patterns. We found that biomass response direction was as likely to change over time as it was to be consistent, and therefore suggest that climate manipulation experiments should be carried out over timescales covering both short- and long-term responses, in order to realistically assess future impacts of climate change.

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