Environmental and canopy stomatal control on ecosystem water use efficiency in a riparian poplar plantation

Xu, Hang; Zhang, Zhiqiang; Xiao, Jingfeng; Chen, Jiquan; Zhu, Mengxun; Cao, Wen; Chen, Zuosinan

doi:10.1016/j.agrformet.2020.107953

Cited by 28 publications

(13 citation statements)

References 104 publications

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“…Resource use efficiency (RUE) is generally defined as the amount of carbon obtained per unit of a resource consumed. At the ecosystem scale, light use efficiency (LUE; i.e., the capacity of an ecosystem to use solar radiation for photosynthesis) and water use efficiency (i.e., the trade‐off between photosynthetic productivity and water consumption) are essential characteristics reflecting ecosystem functions and adaptability to climate change (Keenan et al., 2013; Xu et al., 2020). It is well recognized that forest growth increases with age during early stages of development but often declines after reaching a peak (Besnard et al., 2018; Luyssaert et al., 2008; Tang et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

Canopy photosynthetic capacity drives contrasting age dynamics of resource use efficiencies between mature temperate evergreen and deciduous forests

Xiao

Zhang

et al. 2020

Global Change Biology

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Forest resource use efficiencies (RUEs) can vary with tree age, but the nature of these trends and their underlying mechanisms are not well understood. Understanding the age dynamics of forest RUEs and their drivers is vital for assessing the trade-offs between forest functions and resource consumption, making rational management policy, and projecting ecosystem carbon dynamics. Here we used the FLUXNET2015 and AmeriFlux datasets and published literature to explore the age-dependent variability of forest light use efficiency (LUE) and inherent water use efficiency as well as their main regulatory variables in temperate regions. Our results showed that evergreen forest RUEs initially increased before reaching the mature stage (i.e., around 90 years old), and then gradually declined; in contrast, RUEs continuously increased with age for mature deciduous forests. Changing canopy photosynthetic capacity (A max) was the primary cause of age-related changes in RUEs across temperate forest sites. More importantly, soil nitrogen (N) increased in mature deciduous forests through time but decreased in older evergreen forests. The age-dependent changes in soil N were closely linked with the age dynamics of A max for mature temperate forests. Additionally, soil nutrient conditions played a greater role in deciduous forest RUEs than evergreen forest RUEs. This study highlights the importance of stand age and forest type on temperate forest RUEs over the long term.

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Section: Introductionmentioning

confidence: 99%

Canopy photosynthetic capacity drives contrasting age dynamics of resource use efficiencies between mature temperate evergreen and deciduous forests

Xiao

Zhang

et al. 2020

Global Change Biology

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“…Biophysical parameters. The conductance of canopies (G c , mm s −1 ) of ecosystems in which the canopies are well-coupled to the atmosphere during the growing season essentially represent the stomata conductance of its leaves 43 , which was computed by inverting the Penman-Monteith equation as follows 44 :…”

Section: Declarations Methodsmentioning

confidence: 99%

“…When stomata can maintain the difference between soil and leaf water potential despite changes in VPD, canopy conductance and atmospheric evaporative demand are coupled to water potential along the soilplant-atmosphere continuum by the following relationship 50 : where g su is the surface conductance (i.e., the total ecosystem-atmosphere conductance, mm s -1 ), indicating g a and G c in series (g su =(g a -1 +G c -1 ) -1 ), Ψ s and Ψ l are soil and leaf water potential, respectively, K/A is the hydraulic conductance of the soil-to-canopy pathway (i.e., water ux per time, per leaf area, and per water potential gradient, mm s -1 ). At the canopy scale, K/A can be written as the ratio of water ux (i.e., evapotranspiration, ET) per ground surface area to water potential gradient during the growing season when plant transpiration dominates ecosystem water loss 43,50 . Thus, we calculated the theoretical G c at each VPD value and estimated the theoretical ratio for each site based on Eq.…”

Section: Declarations Methodsmentioning

confidence: 99%

Hyposensitive canopy conductance renders ecosystems vulnerable to extreme droughts

Zhang

Oren

et al. 2021

Preprint

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Increased drought intensity with rising atmospheric demand for water (hereafter VPD) increases the risk of tree mortality worldwide. Ecosystem-scale water-use strategy (WUSe), quantified here by canopy stomatal sensitivity to VPD (Sc), is increasingly recognized as a factor in drought-related ecosystem dysfunction. However, the links between Sc and ecosystem adaptation to and stability following droughts are poorly established. We examined how Sc regulates carbon sequestration, identifying ecosystems potentially susceptible to drought-induced mortality based on data from the global flux network, remote-sensing products, and plant functional-traits archive. We found that Sc is higher where ecosystem water availability is low in arid regions, reflecting conservative WUSe (i.e., hypersensitivity), but ecosystems of all regions converge on permissive WUSe (i.e., hyposensitivity) under ample water supply. During extreme droughts, hyposensitive and hypersensitive ecosystems achieved similar net ecosystem productivity employing considerably different structural-functional strategies. However, hyposensitive ecosystems, risking their hydraulic system with permissive WUSe, did not recover from extreme droughts as quickly. Models predicting current performance and future distributions of vegetation types should account for the greater vulnerability of hyposensitive ecosystems to intensifying atmospheric and soil drought.

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“…Meanwhile, the COS flux is found to be regulated by radiation and the vapor pressure deficit (VPD) [102][103][104][105]. In the diffusional pathway, environmental conditions, such as radiation, the leaf VPD, relative humidity (rH), nitrogen deposition, salinity and aerosol concentrations, also affect stomata conductance [106][107][108]. In the process of COS, CO 2 and H 2 O exchange, the molecule of COS is larger than CO 2 and the adhesional coefficient of COS is different from CO 2 [51,56].…”

Section: The Current State Of Investigation On Photosynthesis and Cos...mentioning

confidence: 99%

“…Blue font characters are the key environmental conditions we filtered from the literature. In the corresponding physiological processes, they act as regulators.The source literature is as follows: light intensity[37,41,51,86,87,90], rH[61][62][63]85,[90][91][92][93][94][106][107][108]115], VPD[102][103][104][105] and C a,COS and C a,CO 2[37,41,[50][51][52][53][54][55][56]60,73,87,97,98,109].…”

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confidence: 99%

Light and Water Conditions Co-Regulated Stomata and Leaf Relative Uptake Rate (LRU) during Photosynthesis and COS Assimilation: A Meta-Analysis

Wang

Chen

et al. 2022

Sustainability

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As a trace gas involved in hydration during plant photosynthesis, carbonyl sulfide (COS) and its leaf relative uptake rate (LRU) is used to reduce the uncertainties in simulations of gross primary productivity (GPP). In this study, 101 independent observations were collected from 22 studies. We extracted the LRU, stomatal conductance (gs), canopy COS and carbon dioxide (CO2) fluxes, and relevant environmental conditions (i.e., light, temperature, and humidity), as well as the atmospheric COS and CO2 concentrations (Ca,COS and Ca,CO2). Although no evidence was found showing that gs regulates LRU, they responded in opposite ways to diurnal variations of environmental conditions in both mixed forests (LRU: Hedges’d = −0.901, LnRR = −0.189; gs: Hedges’d = 0.785, LnRR = 0.739) and croplands dominated by C3 plants (Hedges’d = −0.491, LnRR = −0.371; gs: Hedges’d = 1.066, LnRR = 0.322). In this process, the stomata play an important role in COS assimilation (R2 = 0.340, p = 0.020) and further influence the interrelationship of COS and CO2 fluxes (R2 = 0.650, p = 0.000). Slight increases in light intensity (R2 = 1, p = 0.002) and atmospheric drought (R2 = 0.885, p = 0.005) also decreased the LRU. The LRU saturation points of Ca,COS and Ca,CO2 were observed when ΔCa,COS ≈ 13 ppt (R2 = 0.580, p = 0.050) or ΔCa,CO2 ≈ −18 ppm (R2 = 0.970, p = 0.003). This study concluded that during plant photosynthesis and COS assimilation, light and water conditions co-regulated the stomata and LRU.

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Environmental and canopy stomatal control on ecosystem water use efficiency in a riparian poplar plantation

Cited by 28 publications

References 104 publications

Canopy photosynthetic capacity drives contrasting age dynamics of resource use efficiencies between mature temperate evergreen and deciduous forests

Canopy photosynthetic capacity drives contrasting age dynamics of resource use efficiencies between mature temperate evergreen and deciduous forests

Hyposensitive canopy conductance renders ecosystems vulnerable to extreme droughts

Light and Water Conditions Co-Regulated Stomata and Leaf Relative Uptake Rate (LRU) during Photosynthesis and COS Assimilation: A Meta-Analysis

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