Water use efficiency at multi-time scales and its response to episodic drought and wet periods in a typical subtropical evergreen forest of Southeast China

Li, Yunping; Zhang, Ke; Liu, Linxin

doi:10.1016/j.ecolind.2023.110254

Cited by 7 publications

(3 citation statements)

References 70 publications

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“…Previous studies have indicated that relative humidity and vapor pressure deficit predominantly influence actual and potential evapotranspiration. The air's relative humidity to some extent determines the sensitivity of transpiration to stomatal conductance [51], with an increase in relative humidity facilitating plant water transpiration [52][53][54][55]. Our study corroborates this perspective, demonstrating that WUE decreases with rising RH.…”

Section: The Main Drivers Of Wue Variation In Ecosystemssupporting

confidence: 84%

Dynamics of Water Use Efficiency of Coniferous and Broad-Leaved Mixed Forest in East China

Du,

Xie,

Liu

et al. 2024

Forests

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The aim of our study is to understand the patterns of variation in water use efficiency (WUE) in coniferous and broad-leaved mixed forest ecosystems across multiple scales and to identify its main controlling factors. We employ the eddy covariance method to gather data from 2017, 2018, and 2020, which we use to calculate the gross primary productivity and evapotranspiration of these forests in East China and to determine WUE at the ecosystem level. The mean daily variation in WUE ranges from 4.84 to 7.88 gC kg−1 H2O, with a mean value of 6.12 gC kg−1 H2O. We use ridge regression analysis to ascertain the independent effect of environmental factors on WUE variation. We find that WUE responds differently to environmental factors at different time scales. In mixed conifer ecosystems, temperature and relative humidity emerge as the most significant environmental factors influencing WUE variability. Especially at the seasonal scale, temperature and relative humidity can explain more than 51% of the WUE variation. Our results underscore the varied effects of environmental factors on WUE variation across different time scales and aid in predicting the response of WUE to climate change in coniferous and broad-leaved mixed forest ecosystems.

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Section: The Main Drivers Of Wue Variation In Ecosystemssupporting

confidence: 84%

Dynamics of Water Use Efficiency of Coniferous and Broad-Leaved Mixed Forest in East China

Du,

Xie,

Liu

et al. 2024

Forests

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show abstract

“…The SM and RH were obtained from ERA5-Land and ERA5 reanalysis datasets, respectively (Muñoz Sabater, 2019;Hersbach et al, 2023). The VPD was calculated using RH and TEM (Jiao et al, 2019;Li et al, 2023). These datasets were processed into annual values with a spatial resolution of 0.05° for the period from 2003 to 2018.…”

Section: Datamentioning

confidence: 99%

“…The influencing factors of WUE had significant spatial heterogeneity and varied with the time scales. Li et al (2023) employed structural equation modeling (SEM) to investigate the influences of WUE in a subtropical evergreen forest in southeastern China and found that WUE responded significantly to soil moisture (SM) at different time scales (from half-hourly to monthly scales). Qin et al (2023) used geographic detector modeling (GDM) to discover that land surface temperature (LST) had the strongest driving effect on WUE in Central Asia, and temperature (TEM) had the largest interaction effect with vegetation cover.…”

Section: Introductionmentioning

confidence: 99%

Responses of ecosystem water use efficiency to drought in the Lancang–Mekong River Basin

Xuan

Wang

2023

Front. Ecol. Evol.

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The ecosystem water use efficiency (WUE), a crucial indicator of how climate change will affect terrestrial ecosystems, depicts the coupling of the carbon gain and water loss in terrestrial ecosystems. In this study, the spatiotemporal variations in the WUE and its responses to drought in the Lancang–Mekong River Basin (LMRB) from 1982 to 2018 were investigated using the gross primary productivity (GPP) and evapotranspiration (ET) data acquired from the Global Land Surface Satellite (GLASS) products. The analyses revealed that: (1) the mean yearly WUE for the LMRB was 1.63 g C kg−1 H2O, with comparatively higher values in forests and warm temperate climatic types. The interaction of temperature and leaf area index was the main factor affecting the spatial distribution of WUE. The yearly WUE for the entire region exhibited a decreasing trend with a rate of −0.0009 g C kg −1 H2O·yr−1, and the spatially significantly decreasing area accounted for 41.67% of the total area. (2) The annual WUE was positively correlated with drought in the humid regions, accounting for 66.55% of the total area, while a negative relationship mainly occurred in the high-altitude cold region. (3) The ecosystem WUE lagged behind the drought by 3 months in most regions. The lag effect was more apparent in the grassland-dominated upstream region and the cropland-dominated Mekong Delta. (4) The resilience analysis revealed that the ecosystems in forests and temperate climate types were strongly resistant to drought, while the grassland and high-altitude regions with a dry and cold climate had relatively poor resilience. The results of this study shed light on how the WUE responds to drought across diverse land use types, climate types, and elevation gradients, uncovering fresh insights into the potential mechanisms behind the impact of drought on water and carbon cycles within ecosystems.

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Impacts of heat and drought on the dynamics of water fluxes in a temperate deciduous forest from 2012 to 2020

Elizabeth,

Arain

2024

Agricultural and Forest Meteorology

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Water use efficiency at multi-time scales and its response to episodic drought and wet periods in a typical subtropical evergreen forest of Southeast China

Cited by 7 publications

References 70 publications

Dynamics of Water Use Efficiency of Coniferous and Broad-Leaved Mixed Forest in East China

Dynamics of Water Use Efficiency of Coniferous and Broad-Leaved Mixed Forest in East China

Responses of ecosystem water use efficiency to drought in the Lancang–Mekong River Basin

Impacts of heat and drought on the dynamics of water fluxes in a temperate deciduous forest from 2012 to 2020

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