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Title: Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest

Abstract

At the ecosystem scale, water-use efficiency (WUE) is defined broadly as the ratio of carbon assimilated to water evaporated by an ecosystem. WUE is an important aspect of carbon and water cycling and has been used to assess forest ecosystem responses to climate change and rising atmospheric CO2 concentrations. This study investigates the influence of meteorological and radiation variables on forest WUE by analyzing an 18 year (1998–2015) half-hourly time series of carbon and water fluxes measured with the eddy covariance technique in an old-growth conifer forest in the Pacific Northwest, USA. Three different metrics of WUE exhibit an overall increase over the period 1998–2007 mainly due to an increase in gross primary productivity (GPP) and a decrease in evapotranspiration (ET). However, the WUE metrics did not exhibit an increase across the period from 2008 to 2015 due to a greater reduction in GPP relative to ET. The strength of associations among particular meteorological variables and WUE varied with the scale of temporal aggregation used. In general, vapor pressure deficit and air temperature appear to control WUE at half-hourly and daily time scales, whereas atmospheric CO2 concentration was identified as the most important factor controlling monthly WUE. Carbon and watermore » fluxes and the consequent WUE showed a weak correlation to the Standard Precipitation Index, while carbon fluxes were strongly dependent on the combined effect of multiple climate factors. The inferred patterns and controls on forest WUE highlighted have implications for improved understanding and prediction of possible adaptive adjustments of forest physiology in response to climate change and rising atmospheric CO2 concentrations.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2];  [3];  [4]; ORCiD logo [3]
  1. Oregon State Univ., Corvallis, OR (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Pacific Northwest Research Station, Corvallis, OR (United States). USDA Forest Service
  4. Utah State Univ., Logan, UT (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1548371
Report Number(s):
LLNL-JRNL-764032
Journal ID: ISSN 1748-9326; 954037
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Environmental Research Letters
Additional Journal Information:
Journal Volume: 14; Journal Issue: 7; Journal ID: ISSN 1748-9326
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Jiang, Yueyang, Still, Christopher J., Rastogi, Bharat, Page, Gerald F. M., Wharton, Sonia, Meinzer, Frederick C., Voelker, Steven, and Kim, John B. Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest. United States: N. p., 2019. Web. https://doi.org/10.1088/1748-9326/ab2612.
Jiang, Yueyang, Still, Christopher J., Rastogi, Bharat, Page, Gerald F. M., Wharton, Sonia, Meinzer, Frederick C., Voelker, Steven, & Kim, John B. Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest. United States. https://doi.org/10.1088/1748-9326/ab2612
Jiang, Yueyang, Still, Christopher J., Rastogi, Bharat, Page, Gerald F. M., Wharton, Sonia, Meinzer, Frederick C., Voelker, Steven, and Kim, John B. Tue . "Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest". United States. https://doi.org/10.1088/1748-9326/ab2612. https://www.osti.gov/servlets/purl/1548371.
@article{osti_1548371,
title = {Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest},
author = {Jiang, Yueyang and Still, Christopher J. and Rastogi, Bharat and Page, Gerald F. M. and Wharton, Sonia and Meinzer, Frederick C. and Voelker, Steven and Kim, John B.},
abstractNote = {At the ecosystem scale, water-use efficiency (WUE) is defined broadly as the ratio of carbon assimilated to water evaporated by an ecosystem. WUE is an important aspect of carbon and water cycling and has been used to assess forest ecosystem responses to climate change and rising atmospheric CO2 concentrations. This study investigates the influence of meteorological and radiation variables on forest WUE by analyzing an 18 year (1998–2015) half-hourly time series of carbon and water fluxes measured with the eddy covariance technique in an old-growth conifer forest in the Pacific Northwest, USA. Three different metrics of WUE exhibit an overall increase over the period 1998–2007 mainly due to an increase in gross primary productivity (GPP) and a decrease in evapotranspiration (ET). However, the WUE metrics did not exhibit an increase across the period from 2008 to 2015 due to a greater reduction in GPP relative to ET. The strength of associations among particular meteorological variables and WUE varied with the scale of temporal aggregation used. In general, vapor pressure deficit and air temperature appear to control WUE at half-hourly and daily time scales, whereas atmospheric CO2 concentration was identified as the most important factor controlling monthly WUE. Carbon and water fluxes and the consequent WUE showed a weak correlation to the Standard Precipitation Index, while carbon fluxes were strongly dependent on the combined effect of multiple climate factors. The inferred patterns and controls on forest WUE highlighted have implications for improved understanding and prediction of possible adaptive adjustments of forest physiology in response to climate change and rising atmospheric CO2 concentrations.},
doi = {10.1088/1748-9326/ab2612},
journal = {Environmental Research Letters},
number = 7,
volume = 14,
place = {United States},
year = {2019},
month = {7}
}

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