Drought Primarily Reduces Canopy Transpiration of Exposed Beech Trees and Decreases the Share of Water Uptake from Deeper Soil Layers

Lüttschwager, Dietmar; Jochheim, Hubert

doi:10.3390/f11050537

Cited by 23 publications

(11 citation statements)

References 55 publications

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“…Soil and stem oxygen and hydrogen isotope sampling with moderately high resolution (2–4 d wk −1 ) in a subtropical conifer plantation revealed that tree water sources shifted to deeper soil layers with a seasonally progressing drought (Yang et al ., 2015 ). However, these results contrast with the findings of Lüttschwager & Jochheim ( 2020 ). They applied a mechanistic ecosystem model revealing that in the drought year 2003 beech trees not only reduced total water use but also decreased the relative water uptake from deeper soil layers.…”

Section: Introductioncontrasting

confidence: 97%

Drought reduces water uptake in beech from the drying topsoil, but no compensatory uptake occurs from deeper soil layers

et al. 2021

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The intensity and frequency of droughts events are projected to increase in future with expected adverse effects for forests. Thus, information on the dynamics of tree water uptake from different soil layers during and after drought is crucial.We applied an in situ water isotopologue monitoring system to determine the oxygen isotope composition in soil and xylem water of European beech with a 2-h resolution together with measurements of soil water content, transpiration and tree water deficit. Using a Bayesian isotope mixing model, we inferred the relative and absolute contribution of water from four different soil layers to tree water use.Beech took up more than 50% of its water from the uppermost 5 cm soil layer at the beginning of the 2018 drought, but then reduced absolute water uptake from the drying topsoil by 84%. The trees were not able to quantitatively compensate for restricted topsoil water availability by additional uptake from deeper soil layers, which is related to the fine root depth distribution. Absolute water uptake from the topsoil was restored to pre-drought levels within 3 wk after rewetting.These uptake patterns help to explain both the drought sensitivity of beech and its high recovery potential after drought release.

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Section: Introductioncontrasting

confidence: 97%

Drought reduces water uptake in beech from the drying topsoil, but no compensatory uptake occurs from deeper soil layers

et al. 2021

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“…For example, S Fu et al used sapwood area as a spatially scalar quantity to derive the transpiration water consumption of farmland protection forests in the oasis of Xinjiang [33]. D Lüttschwager et al used basal area as a spatially scalar quantity to analyze and derive a water saving strategy for beech stands in arid regions of northern Germany [34]. In their study, Yue G et al used leaf area as the expanded scalar quantity to scale the water consumption of the Caragana microphylla shrub community in Horqin Sandy Land [22].…”

Section: Discussionmentioning

confidence: 99%

Estimation of Water Consumption of Haloxylon ammodendron Sand-Fixing Forest in Minqin Oasis-Desert Ecotone of China Based on Leaf Index, China

Qiang,

Zhang,

Zhang

et al. 2023

Forests

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In order to accurately estimate the water consumption of a Minqin desert Haloxylon ammodendron sand fixation forest, we used thermal equilibrium stem flow measurement to monitor the stem flow dynamics of Minqin desert H. ammodendron (5, 10, 15, and 20 years old, respectively, denoted as H5, H10, H15, and H20). In this study, we chose the growth index of assimilated branches (expressed as Ab in the following text) as the scalar quantity for expansion, and then estimated the water consumption of the H. ammodendron sand fixation forest by fitting the correlation between the water consumption of single H. ammodendron plants and the surface area and dry weight of single Ab. The results showed that the growth of assimilated H. ammodendron branches and the plant’s monthly water consumption were synchronized, and that the growth of Ab and water consumption were significantly higher during the fast-growth period of H. ammodendron (July) compared to during the leaf-expanding (May) and leaf-falling periods (October). After correlation analysis, it was determined that there was a linear function between the surface area and dry weight of Ab and water consumption in H. ammodendron. The simulated water consumption values (kg) of H. ammodendron sand fixation forests were greatly affected by stand density and branching configuration, and the simulated values of H. ammodendron assimilated branch growth (cm) were slightly smaller than the measured values for forests of different ages, while the simulated values of assimilated branch surface area (cm2) had a much smaller relative error (8.92%) on average. Therefore, it is feasible to use the surface area and dry weight of Ab to calculate the water consumption of H. ammodendron sand fixation forests. This can enable the reliable estimation of the water consumption of H. ammodendron forests and provide a reference for desert vegetation sand fixation afforestation and its ecological water management.

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“…Therefore, forests can conserve water and will not immediately experience a water shortage in the case of rainfall deficiency. During drought, forests with deep roots can take water from deeper soil layers [45], so the LE-H decrease is low. In contrast, grass, shrub, and soybean cannot conserve water.…”

Section: Effect Of Climate Variability On Surface Energy Balancementioning

confidence: 99%

Vulnerability of Primary Productivity and Its Carbon Use Efficiency to Unfavorable Climatic Conditions in Jambi Province, Indonesia

Ma'rufah

June

Ali

et al. 2022

J. Math. Fund. Sci.

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Climatic conditions and land cover play crucial roles in influencing the process of carbon uptake through vegetation. This study aimed to analyze the effect of climate variability on carbon uptake of four different land covers in Jambi Province, Indonesia. The four land cover types studied were: forest, shrub, grass, and irrigated soybean, based on Community Land Model version 5. Forest was found to have the highest net primary production (NPP) compared to the other land covers. Seasonal climate variability showed no major effect on NPP and gross primary production (GPP). However, GPP and NPP experienced significant declines during El Niño Southern Oscillation (ENSO), particularly in 2015. Carbon use efficiency (CUE = NPP/GPP) was also affected by ENSO, where CUE decreased during El Niño, particularly in October and November with an increased number of days without rainfall. In addition, the difference between latent (LE) and sensible heat (H) flux, denoted as (LE-H), decreased from August to November. This difference was highly correlated with NPP. This result indicates that when water supply is low, stomata will close, thereby reducing photosynthesis and transpiration, and allocating more of the available energy to sensible heat flux rather than latent heat flux.

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Drought Primarily Reduces Canopy Transpiration of Exposed Beech Trees and Decreases the Share of Water Uptake from Deeper Soil Layers

Cited by 23 publications

References 55 publications

Drought reduces water uptake in beech from the drying topsoil, but no compensatory uptake occurs from deeper soil layers

Drought reduces water uptake in beech from the drying topsoil, but no compensatory uptake occurs from deeper soil layers

Estimation of Water Consumption of Haloxylon ammodendron Sand-Fixing Forest in Minqin Oasis-Desert Ecotone of China Based on Leaf Index, China

Vulnerability of Primary Productivity and Its Carbon Use Efficiency to Unfavorable Climatic Conditions in Jambi Province, Indonesia

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