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Title: Global patterns and climate drivers of water-use efficiency in terrestrial ecosystems deduced from satellite-based datasets and carbon cycle models

Journal Article · · Global Ecology and Biogeography
DOI:https://doi.org/10.1111/geb.12411· OSTI ID:1348319
 [1];  [2];  [3];  [4];  [3];  [5];  [3];  [3];  [6];  [7];  [8];  [6];  [3];  [9];  [10]
  1. Peking Univ., Beijing (China). Sino-French Inst. for Earth System Science, College of Urban and Environmental Sciences
  2. Peking Univ., Beijing (China). Sino-French Inst. for Earth System Science, College of Urban and Environmental Sciences; Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. of Alpine Ecology and Biodiversity, Inst. of Tibetan Plateau Research; Chinese Academy of Sciences (CAS), Beijing (China). Center for Excellence in Tibetan Plateau Earth Sciences
  3. Peking Univ., Beijing (China). Sino-French Inst. for Earth System Science, College of Urban and Environmental Sciences
  4. Lab. des Sciences du Climat et de l'Environnement (LSCE), Gif-sur-Yvette (France)
  5. CSIRO Land and Water Flagship, Canberra, ACT (Australia)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Inst., Environmental Sciences Division
  7. Peking Univ., Beijing (China). Sino-French Inst. for Earth System Science, College of Urban and Environmental Sciences; Lab. des Sciences du Climat et de l'Environnement (LSCE), Gif-sur-Yvette (France)
  8. Montana State Univ., Bozeman, MT (United States). Inst. on Ecosystems, Dept. of Ecology
  9. CSIRO Oceans and Atmosphere Flagship,Aspendale, Vic.(Australia)
  10. Peking Univ., Shenzhen (China). Shenzhen Graduate School

Our aim is to investigate how ecosystem water-use efficiency (WUE) varies spatially under different climate conditions, and how spatial variations in WUE differ from those of transpiration-based water-use efficiency (WUEt) and transpiration-based inherent water-use efficiency (IWUEt). LocationGlobal terrestrial ecosystems. We investigated spatial patterns of WUE using two datasets of gross primary productivity (GPP) and evapotranspiration (ET) and four biosphere model estimates of GPP and ET. Spatial relationships between WUE and climate variables were further explored through regression analyses. Global WUE estimated by two satellite-based datasets is 1.9 ± 0.1 and 1.8 ± 0.6g C m-2mm-1 lower than the simulations from four process-based models (2.0 ± 0.3g C m-2mm-1) but comparable within the uncertainty of both approaches. In both satellite-based datasets and process models, precipitation is more strongly associated with spatial gradients of WUE for temperate and tropical regions, but temperature dominates north of 50 degrees N. WUE also increases with increasing solar radiation at high latitudes. The values of WUE from datasets and process-based models are systematically higher in wet regions (with higher GPP) than in dry regions. WUEt shows a lower precipitation sensitivity than WUE, which is contrary to leaf- and plant-level observations. IWUEt, the product of WUEt and water vapour deficit, is found to be rather conservative with spatially increasing precipitation, in agreement with leaf- and plant-level measurements. In conclusion, WUE, WUEt and IWUEt produce different spatial relationships with climate variables. In dry ecosystems, water losses from evaporation from bare soil, uncorrelated with productivity, tend to make WUE lower than in wetter regions. Yet canopy conductance is intrinsically efficient in those ecosystems and maintains a higher IWUEt. This suggests that the responses of each component flux of evapotranspiration should be analysed separately when investigating regional gradients in WUE, its temporal variability and its trends.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725; 41530528; 2013CB956303
OSTI ID:
1348319
Journal Information:
Global Ecology and Biogeography, Vol. 25, Issue 3; ISSN 1466-822X
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 90 works
Citation information provided by
Web of Science

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Cited By (11)

Transpiration Dominates Ecosystem Water-Use Efficiency in Response to Warming in an Alpine Meadow journal February 2018
Spatiotemporal patterns of water use efficiency in China and responses to multi-scale drought journal January 2020
Satellite and Station Observations Demonstrate Water Availability's Effect on Continental‐Scale Evaporative and Photosynthetic Land Surface Dynamics journal January 2019
Precipitation and carbon-water coupling jointly control the interannual variability of global land gross primary production journal December 2016
Climate drivers of the terrestrial carbon cycle variability in Europe journal May 2019
Assessment of ecosystem resilience to hydroclimatic disturbances in India journal September 2017
On the use of alternative water use efficiency parameters in dryland ecosystems: a review journal June 2019
Response of Ecosystem Water Use Efficiency to Drought over China during 1982–2015: Spatiotemporal Variability and Resilience journal July 2019
Effects of Climate Factors and Human Activities on the Ecosystem Water Use Efficiency throughout Northern China journal November 2019
Phenology Plays an Important Role in the Regulation of Terrestrial Ecosystem Water-Use Efficiency in the Northern Hemisphere journal June 2017
Spatiotemporal Patterns of Terrestrial Evapotranspiration in Response to Climate and Vegetation Coverage Changes across the Chinese Loess Plateau journal August 2019