Deep roots mitigate drought impacts on tropical trees despite limited quantitative contribution to transpiration

Kühnhammer, Kathrin; Haren, Joost van; Kübert, Angelika; Bailey, Kinzie; Dubbert, Maren; Hu, Jia; Ladd, S. Nemiah; Meredith, Laura; Werner, Christiane; Beyer, Matthias

doi:10.1016/j.scitotenv.2023.164763

Cited by 9 publications

(3 citation statements)

References 92 publications

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“…Vegetation with shallow roots, such as cropland and grassland, exhibits high sensitivity to insufficient soil moisture in the upper layer, leading to a notably rapid response to flash droughts (Pendergrass et al 2020). Ecosystems generally exhibit extended response time with increasing rooting depth, which may be attributed to deeper-rooted vegetation having access to more abundant soil moisture to mitigate water stress (Kühnhammer et al 2023). Specifically, the augmented depth of vegetation roots enhances the efficient utilization of soil moisture resources by plants (Brunner et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Heterogeneity in vegetation recovery rates post-flash droughts across different ecosystems

Lu,

Sun,

Cheng

et al. 2024

Environ. Res. Lett.

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Flash droughts, as sub-seasonal phenomenon, are characterized by their rapid onset and significant impact on terrestrial ecosystems. However, understanding how vegetation responds to flash droughts and mechanisms governing vegetation recovery remains elusive. Here, we analyzed the response of vegetation productivity to flash droughts and the most relevant drivers in post-flash drought vegetation recovery during the growing season using two soil moisture datasets (ERA5-land and GLDAS) and two satellite-based vegetation productivity proxies (Gross Primary Productivity, GPP and Solar-induced chlorophyll fluorescence, SIF). Our results show that South China and Northeastern China stand out as hotspots for flash droughts, with higher frequency and speed. Notably, although the frequency of flash droughts in cropland is relatively low, its speed is very high, with a median of 10.9% per pentad. Most ecosystems can recover to their normal state within 25 days. Vegetation with shallow roots, such as cropland and grassland, responds rapidly to flash droughts. Ecosystems generally exhibit extended response time with increasing plant rooting depth. The recovery rate of vegetation productivity from flash droughts is mainly controlled by vegetation physiology (decline rate of productivity upon exposure to flash drought) and modulated by flash drought characteristics, especially severity for forests and speed for cropland and grassland. This study provided valuable insights into the mechanisms underlying vegetation responses to flash droughts.

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Section: Discussionmentioning

confidence: 99%

Heterogeneity in vegetation recovery rates post-flash droughts across different ecosystems

Lu,

Sun,

Cheng

et al. 2024

Environ. Res. Lett.

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“…12,37 If these steps are followed, new in-situ methods provide an enormous advantage and can provide insights into ecohydrological dynamics and processes on a (sub) daily basis. 42,43,59 5 CONCLUSION…”

Section: Cve Work Well-for Pure Water Samplesmentioning

confidence: 98%

“…39 Yet, it has been demonstrated that the analysed water mixing ratio in CRDS has a strong impact on obtained δ 2 H and δ 18 O values, 37,38,40 which has high relevance for studies, where the isotopic composition is measured directly (and is difficult to control) in the water vapour, such as soil evaporation, soil water vapour, atmospheric water vapour, plant transpiration or xylem water in the gas phase. 12,41,42 With the development and application of new water stable isotopologue measurement techniques, 2,8,10,12,43,44 which are based on the direct measurement of water vapour of different mixing ratios, the water mixing ratio-dependency of stable water isotopologues with CRDS is gaining relevance. The direct equilibration method to sample, for instance, soil water vapour is based on thermodynamic equilibrium and full water vapour saturation, which is controlled by the ambient temperature that typically varies considerably under natural conditions.…”

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confidence: 99%

Two common pitfalls in the analysis of water‐stable isotopologues with cryogenic vacuum extraction and cavity ring‐down spectroscopy

Haberstroh,

Kübert,

Werner

2024

Analytical Science Advances

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Water stable isotopologue analysis is widely used to disentangle ecohydrological processes. Yet, there are increasing reports of measurement uncertainties for established and emerging methods, such as cryogenic vacuum extraction (CVE) or cavity ring‐down spectroscopy (CRDS). With this study, we investigate two pitfalls, that potentially contribute to uncertainties in water‐stable isotopologue research. To investigate fractionation sources in CVE, we extracted pure water of known isotopic composition with cotton, glass wool or without cover and compared the isotopologue results with non‐extracted reference samples. To characterise the dependency of δ2H and δ18O on the water mixing ratio in CRDS, which is of high importance for in‐situ applications with large natural variations in mixing ratios, we chose samples with a large range of isotopic compositions and determined δ2H and δ18O for different water mixing ratios with two CRDS analysers (Picarro, Inc.). Cotton wool had a strong fractionation effect on δ2H values, which increased with more 2H‐enriched samples. δ2H and δ18O values showed a strong dependency on the water mixing ratio analysed with CRDS with differences of up to 34.5‰ (δ2H) and 3.9‰ (δ18O) for the same sample at different mixing ratios. CVE and CRDS, now routinely applied in water stable isotopologue research, come with pitfalls, namely fractionation effects of cover materials and water mixing ratio dependencies of δ2H and δ18O, which can lead to erroneous isotopologue results and thus, invalid conclusions about (ecohydrological) processes. These practical issues identified here should be reported and addressed adequately in water‐stable isotopologue research.

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Unraveling the effects of plant and soil properties on tree water absorption in pure and mixed forests across subtropical China

Zhang,

Xu,

Liu

et al. 2024

Agricultural and Forest Meteorology

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Deep roots mitigate drought impacts on tropical trees despite limited quantitative contribution to transpiration

Cited by 9 publications

References 92 publications

Heterogeneity in vegetation recovery rates post-flash droughts across different ecosystems

Heterogeneity in vegetation recovery rates post-flash droughts across different ecosystems

Two common pitfalls in the analysis of water‐stable isotopologues with cryogenic vacuum extraction and cavity ring‐down spectroscopy

Unraveling the effects of plant and soil properties on tree water absorption in pure and mixed forests across subtropical China

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