Sap flux-scaled transpiration and stomatal conductance response to soil and atmospheric drought in a semi-arid sagebrush ecosystem

Naithani, Kusum J.; Ewers, B. E.; Pendall, Elise

doi:10.1016/j.jhydrol.2012.07.008

Cited by 97 publications

(70 citation statements)

References 89 publications

(128 reference statements)

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“…Sap flow can be used to reflect species-specific water consumption by plants (Ewers et al, 2002;Baldocchi, 2005;Naithani et al, 2012). Sap flow can also be used to continuously monitor canopy conductance and its response to environmental variables Naithani et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Soil moisture control of sap-flow response to biophysical factors in a desert-shrub species, <i>Artemisia ordosica</i>

et al. 2017

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Abstract. The current understanding of acclimation processes in desert-shrub species to drought stress in dryland ecosystems is still incomplete. In this study, we measured sap flow in Artemisia ordosica and associated environmental variables throughout the growing seasons of 2013 and 2014 (May-September period of each year) to better understand the environmental controls on the temporal dynamics of sap flow. We found that the occurrence of drought in the dry year of 2013 during the leaf-expansion and leaf-expanded periods caused sap flow per leaf area (J s ) to decline significantly, resulting in transpiration being 34 % lower in 2013 than in 2014. Sap flow per leaf area correlated positively with radiation (R s ), air temperature (T ), and water vapor pressure deficit (VPD) when volumetric soil water content (VWC) was greater than 0.10 m 3 m −3 . Diurnal J s was generally ahead of R s by as much as 6 hours. This time lag, however, decreased with increasing VWC. The relative response of J s to the environmental variables (i.e., R s , T , and VPD) varied with VWC, J s being more strongly controlled by plant-physiological processes during periods of dryness indicated by a low decoupling coefficient and low sensitivity to the environmental variables. According to this study, soil moisture is shown to control sap-flow (and, therefore, plant-transpiration) response in Artemisia ordosica to diurnal variations in biophysical factors. This species escaped (acclimated to) water limitations by invoking a water-conservation strategy with the regulation of stomatal conductance and advancement of J s peaking time, manifesting in a hysteresis effect. The findings of this study add to the knowledge of acclimation processes in desert-shrub species under droughtassociated stress. This knowledge is essential in modeling desert-shrub-ecosystem functioning under changing climatic conditions.

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Section: Introductionmentioning

confidence: 99%

“…Sap flow can also be used to continuously monitor canopy conductance and its response to environmental variables Naithani et al, 2012). Biotic and abiotic effects on sap flow and transpiration are often interactive and confounded.…”

Section: Introductionmentioning

confidence: 99%

Soil moisture control of sap-flow response to biophysical factors in a desert-shrub species, <i>Artemisia ordosica</i>

et al. 2017

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“…The rate of plant water use under a given microclimate condition generally depends on available water for plant uptake, root distribution, and species sensitivity to soil and atmospheric drought (Oren et al, 1996). It is critical to understand the water use characteristic and physiological responses of arid plant species to drought and the underlying mechanisms for accurately predicting long-term ecosystem carbon, water, and energy fluxes (Naithani et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Responses of shelterbelt stand transpiration to drought and groundwater variations in an arid inland river basin of Northwest China

Shen

Gao

et al. 2015

Journal of Hydrology

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s u m m a r yPlant water use characteristics and transpiration responses under dry conditions are considered essential for effective and sustainable ecosystem management in arid areas. This study was conducted to evaluate the response of shelterbelt stand transpiration to precipitation, soil drought and groundwater variations in an oasis-desert ecotone in the middle of the Heihe River Basin, China. Sap flow was measured in eight Gansu Poplar trees (Populus Gansuensis) with different diameter at breast height over three consecutive growing seasons (2012)(2013)(2014). The groundwater evapotranspiration via plant use was estimated by the White method with diurnal water table fluctuations. The results showed that precipitation increased the stand transpiration but not statistically significant (paired t-test, p > 0.05). The recharge of soil water by irrigation caused stand transpiration acceleration significantly (t-test, p < 0.05). Stand transpiration and canopy conductance increased by 27% and 31%, respectively, when soil water conditions changed from dry to wet. Canopy conductance decreased logarithmically with vapor pressure deficit, while there was no apparent relationship between canopy conductance and solar radiation. The sensitivity of canopy conductance to vapor pressure deficit decreased under dry soil conditions. Groundwater evapotranspiration (0.6-7.1 mm day À1) was linearly correlated with stand transpiration (1.1-6.5 mm day À1 ) (R 2 = 0.71), and these two variables had similar variability. During the drought period, approximately 80% of total stand transpiration came from groundwater evapotranspiration. This study highlighted the critical role of irrigation and groundwater for shelterbelt, and might provide the basis for the development of water requirement schemes for shelterbelt growth in arid inland river basins.

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“…Similar result was reported by Zheng and Wang 2014 for the same species. This happened much earlier than other semiarid species 0 ~ 2 h, Du et al, 2011;Naithani et al, 2012 and rain-forest species 1 ~ 4 h, Motzer et al, 2005 , indicating stronger water defi cit and larger stomatal regulation on water use of H. ammodendron. Compared to peak water use at midday commonly found in other species in mesic and semiarid regions Oren and Pataki, 2001;Tang et al, 2006, Du et al, 2011 , the whole plant water use of H. ammodendron during mid and past midday time was largely depressed, which was related to stomatal closure induced by decreased leaf water potential and whole plant hydraulic conductance under high atmospheric drought Tyree, 2003;Xu et al, 2011;Zhao, 2011 .…”

Section: Response Patterns Of G S To Climate Driversmentioning

confidence: 78%

“…Mean g s at leaf scale was 20.23 mmol m 2 s 1 , which was signifi cantly higher than that at branch and whole plant scales P < 0.01 . On the other hand, the mean g s values were nearly identical to both branch and whole plant scales Naithani et al, 2012 . The different results compared to previous studies might be related to different soil water contents, climate drivers and/or plant functional traits C 3 /C 4 .…”

Section: Response Patterns Of G S To Climate Driversmentioning

confidence: 84%

Non-convergent transpiration and stomatal conductance response of a dominant desert species in central Asia to climate drivers at leaf, branch and whole plant scales

Wang

Mallik

2018

J. Agric. Meteorol.

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Desert ecosystems exposed to extreme droughts are vulnerable to climate change. Multi-scale mechanism of hydrological adaptation of desert plants to drought are not fully understood, creating uncertainty in risk assessment of desert ecosystems to climate change by ecological modelling. In this study, we investigated multi-scale water use strategies of Haloxylon ammodendron, a dominant desert shrub across central Asia. We found that whole plant water use of H. ammodendron was significantly reduced during most of the daytime period ca. 79 . At low light water use was controlled by photosynthetic photon flux density PPFD and at high vapour pressure deficit VPD it was further conserved by stomatal closure. It appears that water conservation in H. ammodendron at leaf-scale may behave differently with that at whole plant scale. High stomatal sensitivity to VPD at whole plant scale means more conservative water use strategy at plant scale than branch-and leaf-scale. Response of transpiration and stomata to climate drivers were non-convergent among leaf, branch and whole plant scales for this desert shrub. Therefore, one must be cautious in up scaling leaf-scale data to infer canopy scale water conservation to avoid overestimation of plant response to climate drivers. Nonetheless, our results enrich the database of multi-scale water use response of desert plants to climate drivers, which is critical for ecological modelling aiming to predict arid land vulnerability to climate change.

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Sap flux-scaled transpiration and stomatal conductance response to soil and atmospheric drought in a semi-arid sagebrush ecosystem

Cited by 97 publications

References 89 publications

Soil moisture control of sap-flow response to biophysical factors in a desert-shrub species, <i>Artemisia ordosica</i>

Soil moisture control of sap-flow response to biophysical factors in a desert-shrub species, <i>Artemisia ordosica</i>

Responses of shelterbelt stand transpiration to drought and groundwater variations in an arid inland river basin of Northwest China

Non-convergent transpiration and stomatal conductance response of a dominant desert species in central Asia to climate drivers at leaf, branch and whole plant scales

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Sap flux-scaled transpiration and stomatal conductance response to soil and atmospheric drought in a semi-arid sagebrush ecosystem

Cited by 97 publications

References 89 publications

Soil moisture control of sap-flow response to biophysical factors in a desert-shrub species, &lt;i&gt;Artemisia ordosica&lt;/i&gt;

Soil moisture control of sap-flow response to biophysical factors in a desert-shrub species, &lt;i&gt;Artemisia ordosica&lt;/i&gt;

Responses of shelterbelt stand transpiration to drought and groundwater variations in an arid inland river basin of Northwest China

Non-convergent transpiration and stomatal conductance response of a dominant desert species in central Asia to climate drivers at leaf, branch and whole plant scales

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Soil moisture control of sap-flow response to biophysical factors in a desert-shrub species, <i>Artemisia ordosica</i>

Soil moisture control of sap-flow response to biophysical factors in a desert-shrub species, <i>Artemisia ordosica</i>