Anatomical explanations for acute depressions in radial pattern of axial sap flow in two diffuse-porous mangrove species: implications for water use

Zhao, Hewei; Yang, Song; Guo, Xudong; Peng, Congjiao; Gu, Xiaoxiong; Deng, Congrui; Chen, Luzhen

doi:10.1093/treephys/tpx172

Cited by 16 publications

(4 citation statements)

References 49 publications

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“…However, volume of water flux in mangroves is low versus many terrestrial forest trees (Fig. 1 b) because sap flow with depth into sapwood (from cambium beyond depths of 2 cm) attenuates quickly 37 , 38 , which reduces the total amount of water ascending the tree stem to become available to foliage. Canopy leaf-area is adjusted in sync with stem capacity for water transport; with canopies dying back when water is less available or expanding as water supply increases 39 , 40 .…”

Section: Discussionmentioning

confidence: 99%

Mangroves provide blue carbon ecological value at a low freshwater cost

Krauss

Lovelock

Chen

et al. 2022

Sci Rep

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Abstract“Blue carbon” wetland vegetation has a limited freshwater requirement. One type, mangroves, utilizes less freshwater during transpiration than adjacent terrestrial ecoregions, equating to only 43% (average) to 57% (potential) of evapotranspiration ($$ET$$ ET ). Here, we demonstrate that comparative consumptive water use by mangrove vegetation is as much as 2905 kL H2O ha−1 year−1 less than adjacent ecoregions with $${E}_{c}$$ E c -to-$$ET$$ ET ratios of 47–70%. Lower porewater salinity would, however, increase mangrove $${E}_{c}$$ E c -to-$$ET$$ ET ratios by affecting leaf-, tree-, and stand-level eco-physiological controls on transpiration. Restricted water use is also additive to other ecosystem services provided by mangroves, such as high carbon sequestration, coastal protection and support of biodiversity within estuarine and marine environments. Low freshwater demand enables mangroves to sustain ecological values of connected estuarine ecosystems with future reductions in freshwater while not competing with the freshwater needs of humans. Conservative water use may also be a characteristic of other emergent blue carbon wetlands.

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Section: Discussionmentioning

confidence: 99%

Mangroves provide blue carbon ecological value at a low freshwater cost

Krauss

Lovelock

Chen

et al. 2022

Sci Rep

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“…Sap flow was measured using Granier-type thermal dissipation probes as per Zhao et al. (2018) ( Figure 1 ).…”

Section: Methodsmentioning

confidence: 99%

Nocturnal sap flow as compensation for water deficits: an implicit water-saving strategy used by mangroves in stressful environments

Zheng

et al. 2023

Front. Plant Sci.

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As part of the plant water-use process, plant nocturnal sap flow (Qn) has been demonstrated to have important ecophysiological significance to compensate for water loss. The purpose of this study was to explore nocturnal water-use strategies to fill the knowledge gap in mangroves, by measuring three species co-occurring in a subtropical estuary. Sap flow was monitored over an entire year using thermal diffusive probes. Stem diameter and leaf-level gas exchange were measured in summer. The data were used to explore the different nocturnal water balance maintaining mechanisms among species. The Qn existed persistently and contributed markedly over 5.5%~24.0% of the daily sap flow (Q) across species, which was associated with two processes, nocturnal transpiration (En) and nocturnal stem water refilling (Rn). We found that the stem recharge of the Kandelia obovata and Aegiceras corniculatum occurred mainly after sunset and that the high salinity environment drove higher Qn while stem recharge of the Avicennia marina mainly occurred in the daytime and the high salinity environment inhibited the Qn. The diversity of stem recharge patterns and response to sap flow to high salinity conditions were the main reasons for the differences in Qn/Q among species. For Kandelia obovata and Aegiceras corniculatum, Rn was the main contributor to Qn, which was driven by the demands of stem water refilling after diurnal water depletion and high salt environment. Both of the species have a strict control over the stomata to reduce water loss at night. In contrast, Avicennia marina maintained a low Qn, driven by vapor pressure deficit, and the Qn mainly used for En, which adapts to high salinity conditions by limiting water dissipation at night. We conclude that the diverse ways Qn properties act as water-compensating strategies among the co-occurring mangrove species might help the trees to overcoming water scarcity.

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“…Sap flow was measured using Granier-type thermal dissipation probes as per Zhao et al (2018) (Fig. 1).…”

Section: Sap Flow Measurementsmentioning

confidence: 99%

Nocturnal Sap Flow as Compensation for Water Deficits: An Implicit Water-saving Strategy Used by Mangroves in Stressful Environments

Chen

et al. 2022

Preprint

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As part of the plant water-use process, plant nocturnal sap flow ( Q) has been demonstrated to have important ecophysiological significance to compensate for water loss. The purpose of this study was to explore nocturnal water-use strategies to fill the knowledge gap in mangroves, by measuring three species co-occurring in a subtropical estuary. The Q existed persistently and contributed markedly over 5.5%~24.0% of the daily sap flow ( Q) across species, which was associated with two processes, nocturnal transpiration ( E) and nocturnal stem water refilling ( R). The diversity of stem recharge patterns and response to sap flow to high salinity conditions were the main reasons for the differences in Q/ Q among species. For Kandelia obovata and Aegiceras corniculatum, R was the main contributor to Q, which driven by the demands of stem water refilling after diurnal water depletion and high salinity. In contrast, Avicennia marina maintained a low Q, driven by vapor pressure deficit, and the Q mainly used for E, which adapts to high salinity conditions by limiting water dissipation at night. We conclude that the diverse ways Q properties act as water-compensating strategies among the co-occurring mangrove species might help the trees to overcoming water scarcity.

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Anatomical explanations for acute depressions in radial pattern of axial sap flow in two diffuse-porous mangrove species: implications for water use

Cited by 16 publications

References 49 publications

Mangroves provide blue carbon ecological value at a low freshwater cost

Mangroves provide blue carbon ecological value at a low freshwater cost

Nocturnal sap flow as compensation for water deficits: an implicit water-saving strategy used by mangroves in stressful environments

Nocturnal Sap Flow as Compensation for Water Deficits: An Implicit Water-saving Strategy Used by Mangroves in Stressful Environments

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