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Title: Spatial and temporal variations in plant water-use efficiency inferred from tree-ring, eddy covariance and atmospheric observations

Journal Article · · Earth System Dynamics (Online)
 [1];  [2];  [3];  [4];  [2]
  1. Utrecht Univ., Utrecht (The Netherlands)
  2. Univ. of Exeter, Exeter (United Kingdom)
  3. Met Office Hadley Centre, Exeter (United Kingdom)
  4. Centre for Ecology and Hydrology, Wallingford (United Kingdom)

Plant water-use efficiency (WUE), which is the ratio of the uptake of carbon dioxide through photosynthesis to the loss of water through transpiration, is a very useful metric of the functioning of the land biosphere. WUE is expected to increase with atmospheric CO2, but to decline with increasing atmospheric evaporative demand – which can arise from increases in near-surface temperature or decreases in relative humidity. We have used Δ13C measurements from tree rings, along with eddy covariance measurements from Fluxnet sites, to estimate the sensitivities of WUE to changes in CO2 and atmospheric humidity deficit. This enables us to reconstruct fractional changes in WUE, based on changes in atmospheric climate and CO2, for the entire period of the instrumental global climate record. We estimate that overall WUE increased from 1900 to 2010 by 48 ± 22 %, which is more than double that simulated by the latest Earth System Models. This long-term trend is largely driven by increases in CO2, but significant inter-annual variability and regional differences are evident due to variations in temperature and relative humidity. Here, there are several highly populated regions, such as western Europe and East Asia, where the rate of increase of WUE has declined sharply in the last 2 decades. Our data-based analysis indicates increases in WUE that typically exceed those simulated by Earth System Models – implying that these models are either underestimating increases in photosynthesis or underestimating reductions in transpiration.

Research Organization:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
Grant/Contract Number:
FG02-04ER63917; FG02-04ER63911
OSTI ID:
1313713
Journal Information:
Earth System Dynamics (Online), Vol. 7, Issue 2; ISSN 2190-4987
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Cited By (17)

Scarce population genetic differentiation but substantial spatiotemporal phenotypic variation of water-use efficiency in Pinus sylvestris at its western distribution range journal October 2018
Forest‐Type‐Dependent Water Use Efficiency Trends Across the Northern Hemisphere journal August 2018
Recent increases in terrestrial carbon uptake at little cost to the water cycle journal July 2017
Disentangling the role of photosynthesis and stomatal conductance on rising forest water-use efficiency journal August 2019
Coupling between the terrestrial carbon and water cycles—a review journal July 2019
Observed and modelled historical trends in the water‐use efficiency of plants and ecosystems journal May 2019
How do leaf and ecosystem measures of water-use efficiency compare? journal June 2017
Plant carbon metabolism and climate change: elevated CO 2 and temperature impacts on photosynthesis, photorespiration and respiration journal July 2018
Historical changes in the stomatal limitation of photosynthesis: empirical support for an optimality principle journal December 2019
Gas exchange and water‐use efficiency in plant canopies journal December 2018
Constraints to Vegetation Growth Reduced by Region-Specific Changes in Seasonal Climate journal February 2019
Interannual and Seasonal Variations in Ecosystem Transpiration and Water Use Efficiency in a Tropical Rainforest journal December 2018
Ideas and perspectives: how coupled is the vegetation to the boundary layer? journal January 2017
Examining the evidence for decoupling between photosynthesis and transpiration during heat extremes journal January 2019
Coupling between the terrestrial carbon and water cycles-a review text January 2019
Elevated CO2 Did Not Stimulate Stem Growth in 11 Provenances of a Globally Important Hardwood Plantation Species journal June 2020
Nitrogen leaching from natural ecosystems under global change: a modelling study journal March 2017

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