Biophysical limits to responses of water flux to vapor pressure deficit in seven tree species with contrasting land use regimes

Gao, Jianguo; Zhao, Ping; Shen, Wei; Niu, Junfeng; Zhu, Liwei; Ni, Guoxi

doi:10.1016/j.agrformet.2014.10.007

Cited by 46 publications

(32 citation statements)

References 63 publications

(78 reference statements)

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“…In our study, the increase in daily E t with increasing VPD suggests a weak stomatal control of transpiration and indicates possible anisohydric regulation and non‐conservative water use. This response is in agreement with the view point of Gao et al (), who described that this eucalypt hybrid has relatively low stomatal control of water use. Moreover, the precipitation showed a significantly uneven distribution, and the stand‐scale transpiration did not show a significant linear relationship with precipitation ( p > .05).…”

Section: Discussionsupporting

confidence: 92%

Stand‐scale transpiration of a Eucalyptus urophylla × Eucalyptus grandis plantation and its potential hydrological implication

et al. 2018

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Quantifying tree transpiration at a stand scale is important for understanding the hydrological impact of Eucalyptus plantations on the local water yield and water balance. In this study, we aimed to explore the seasonal and monthly changes in stand transpiration, its response to climatic factors, and hydrological impacts of a 5‐year‐old Eucalyptus urophylla × Eucalyptus grandis plantation in Guangxi Province, Southern China. Stand‐scale transpiration (Et) and potential evapotranspiration (ETo) were determined, and seasonal sensitivity of daily Et to vapour pressure deficit was analysed by using the monitored sap flux of the E. urophylla × E. grandis plantation and the associated environmental factors during a 2‐year experimental period from June 2012 to May 2014. The results showed that the monthly Et values in the wet seasons were higher than those in the dry seasons, and a temporal Et difference was observed between the 2 years of the experiment. Generally, within a whole experimental year, the highest water consumption mainly occurred from May to August, accounting for more than 40% of the annual total, and the lowest transpiration values (approximately 10 mm) mainly occurred from January to March. This monthly variation would be partly attributed to the difference of climatic factors. Clear seasonal variations were also observed for the ETo values, the Et/ETo and the Et/P (precipitation) ratios, and the dryness index (DI, ETo/P). Compared to the wet seasons, higher ETo and DI (>1) values occurred in the dry seasons. Moreover, the linear relationships between the daily stand‐scale transpiration and vapour pressure deficit for the selected months (representing spring, summer, autumn, and winter) suggest weak stomatal control of eucalypt trees. In consideration of the short rotation practices (5–7 years), the non‐conservative character of water use of eucalypt plantation, as well as the ratios of Et/ETo, Et/P, and DI, we suggested that Eucalyptus plantations in Guangxi Province might pose a potential threat to catchment water yield and management in this region. The findings of this study will assist in managing the increasing hydrological and water resource concerns related to the rapid expansion of Eucalyptus plantations in Southern China.

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Section: Discussionsupporting

confidence: 92%

Stand‐scale transpiration of a Eucalyptus urophylla × Eucalyptus grandis plantation and its potential hydrological implication

et al. 2018

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“…It is common for species within the same ecosystem to employ opposing hydraulic strategies (e.g., risk prone or risk adverse; McCulloh et al, ; Ford et al, ). Disparities in transpiration volume and timing, due to differences in whole‐plant hydraulic strategies employed within the same forest, have important implications for forest growth and response to drought and disturbance (Roman et al, ; McDowell et al, ; Matheny et al, ; Gao et al, ; Gu, Pallardy, Hosman, & Sun, ; Wullschleger, Meinzer, & Vertessy, ). Several water flux studies have shown that many species of ring‐porous, anisohydric oak continue to transpire after other species curtail their water use during mild to moderate drought (e.g., von Allmen, Sperry, & Bush, ; Baldocchi & Xu, ; Hernandez‐Santana, Martinez‐Fernandez, Moran, & Cano, ; Matheny et al, ).…”

Section: Introductionmentioning

confidence: 99%

Contrasting strategies of hydraulic control in two codominant temperate tree species

et al. 2016

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Biophysical controls on plant water status exist at the leaf, stem, and root levels. Therefore, we pose that hydraulic strategy is a combination of traits governing water use at each of these three levels. We studied sap flux, stem water storage, stomatal conductance, photosynthesis, and growth of red oaks (Quercus rubra) and red maples (Acer rubrum). These species differ in stomatal hydraulic strategy and xylem architecture and may root at different depths. Stable isotope analysis of xylem water was used to identify root water uptake depth. Oaks were shown to access a deeper water source than maples. During non‐limiting soil moisture conditions, transpiration was greater in maples than in oaks. However, during a soil dry down, transpiration and stem water storage decreased by more than 80% and 28% in maples but only by 31% and 1% in oaks. We suggest that the preferential use of deep water by red oaks allows the species to continue transpiration and growth during soil water limitations. In this case, deeper roots may provide a buffer against drought‐induced mortality. Using 14 years of growth data, we show that maple growth correlates with mean annual soil moisture at 30 cm but oak growth does not. The observed responses of oak and maple to drought were not able to be explained by leaf and xylem physiology alone. We employed the Finite‐difference Ecosystem‐scale Tree Crown Hydrodynamics model version 2 plant hydrodynamics model to demonstrate the influence of root, stem, and leaf controls on tree‐level transpiration. We conclude that all three levels of hydraulic traits are required to define hydraulic strategy.

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“…which presumes that J s is equal to canopy transpiration, and J s is not influenced by hydraulic capacitance [30,31].…”

Section: Canopy Conductance Per Sapwood Areamentioning

confidence: 99%

Assessing Environmental Control of Sap Flux of Three Tree Species Plantations in Degraded Hilly Lands in South China

Wang

Lintunen

Zhao

et al. 2020

Forests

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Prerequisite for selection of appropriate tree species in afforestation programs is to understand their water use strategy. Acacia mangium Willd., Schima wallichii Choisy, and Cunninghamia lanceolata (Lamb.) Hook are the three main vegetation restoration pioneer species in southern China, but no comparative research on the water use strategy of these three tree species have been reported. Our objective was to gain a detailed understanding of how photosynthetically active radiation (PAR), vapor pressure deficit (VPD), and soil water content (SWC) at different soil depths control the sap flux density (Js) in the dry and wet seasons. We measured the Js of these three tree species by using the thermal dissipation method in low subtropical China. We found that both S. wallichii and C. lanceolata differed clearly in their stomatal behavior from one season to another, while A. mangium did not. The canopy conductance per sapwood area of S. wallichii and C. lanceolata was very sensitive to VPD in the dry season, but not in the wet season. The Js of A. mangium was negatively correlated to SWC in all soil layers and during both seasons, while the other two species were not sensitive to SWC in the deeper layers and only positively correlated to SWC in dry season. Our results demonstrate that the three species have distinct water use strategies and may therefore respond differently to changing climate.

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Biophysical limits to responses of water flux to vapor pressure deficit in seven tree species with contrasting land use regimes

Cited by 46 publications

References 63 publications

Stand‐scale transpiration of a Eucalyptus urophylla × Eucalyptus grandis plantation and its potential hydrological implication

Stand‐scale transpiration of a Eucalyptus urophylla × Eucalyptus grandis plantation and its potential hydrological implication

Contrasting strategies of hydraulic control in two codominant temperate tree species

Assessing Environmental Control of Sap Flux of Three Tree Species Plantations in Degraded Hilly Lands in South China

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