Ecohydrological interactions during drought

Klaus, Julian; Monk, Wendy; Zhang, Lu; Hannah, David M.

doi:10.1002/eco.2456

Cited by 3 publications

(1 citation statement)

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“…The severity of water limitation is variable in space, time, and among domains of the hydrological cycle (Klaus et al, 2022;Tijdeman et al, 2022), and is expected to affect tree species performance not only at the limits but also at the centre of their distribution range (Parmesan, 2006), where trees are assumed to benefit from the most suited growing conditions. Multiple…”

Section: Introductionmentioning

confidence: 99%

Contrasting water use strategies of beech trees along two hillslopes with different slope and climate

Fabiani,

Klaus,

Penna

2023

Preprint

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Abstract. Understanding the interaction between topography and vegetation across different environments is important to assess how hydrological and climatic conditions affect tree physiological activity. This becomes especially important given the expected reduction in water availability and increase in water demand driven by climate change. These extremes could enhance the thermal and hydrologic gradients along slopes. Here, we aimed at testing if and how different climatic and hydrological conditions affect the physiological response to environmental variables of beech trees (Fagus sylvatica L.) along two different topographic sequences. For this purpose, we set up a comparative study on a gentle hillslope in the Weierbach catchment in Luxembourg (oceanic climate) and a steep hillslope in the Lecciona catchment in Italy (Mediterranean climate). We combined sap velocity measurements with isotopic measurements of soil, precipitation, stream water, groundwater, and xylem over 2019 and 2020 in the Luxembourgish site and 2021 in the Italian site. We found that in the Weierbach catchment, trees' response to environmental variables (i.e., vapour pressure deficit and relative extractable water in the soil) was similar among hillslope positions and between the two monitored years resulting from homogeneous growing conditions along the topographic sequence. We also did not find any statistical difference in the isotopic composition of xylem water among positions suggesting that beech trees relied on similar water sources across the landscape. In the Lecciona catchment, we observed lower sap velocities and shorter growing season in trees growing in the upper portions of the hillslope, likely related to water redistribution and different soil moisture along the hillslope catena. Xylem isotopic composition was significantly lighter at the footslope location throughout the growing season than in the upslope locations, suggesting location-specific water use. These results emphasize how differing hydrometeorological processes occurring at the hillslope scale can lead to contrasting tree performances.

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Section: Introductionmentioning

confidence: 99%

Contrasting water use strategies of beech trees along two hillslopes with different slope and climate

Fabiani,

Klaus,

Penna

2023

Preprint

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show abstract

Introduction

Tallaksen,

Van Lanen

2024

Hydrological Drought

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The influence of hillslope topography on beech water use: a comparative study in two different climates

Fabiani,

Klaus,

Penna

2024

Hydrol. Earth Syst. Sci.

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Abstract. Understanding the interrelation between topography and vegetation across different environments is important to assess how hydrological and climatic conditions affect tree physiological activity. This becomes especially important given the expected reduction in water availability and the increase in water demand driven by climate change. These extremes could enhance the thermal and hydrologic gradients along slopes. Here, we aimed to test if and how different climatic and hydrological conditions affect the physiological response of beech trees (Fagus sylvatica L.) to environmental variables along two different topographic sequences. For this purpose, we set up a comparative study on a gentle hillslope in the Weierbach catchment in Luxembourg (oceanic climate) and on a steep hillslope in the Lecciona catchment in Italy (Mediterranean climate). We combined sap velocity measurements with isotopic measurements of soil, precipitation, stream water, groundwater, and xylem over 2019 and 2020 for the Luxembourgish site and over 2021 for the Italian site. We found that, in the Weierbach catchment, trees' responses to environmental variables (i.e. vapour pressure deficit and relative extractable water in the soil) were similar among hillslope positions and between the two monitored years, resulting from homogeneous growing conditions along the topographic sequence. We also did not find any statistical difference in the isotopic composition of xylem water between positions, suggesting that beech trees relied on similar water sources across the landscape. In the Lecciona catchment, we observed lower sap velocities and shorter growing season in trees growing in the upper portions of the hillslope, likely related to water redistribution and different soil moisture along the hillslope catena. Xylem isotopic composition was significantly lighter at the footslope location throughout the growing season than in the upslope locations, suggesting location-specific water use. These results emphasize how differing hydrometeorological processes occurring at the hillslope scale can lead to contrasting tree responses.

show abstract

Ecohydrological interactions during drought

Cited by 3 publications

References 43 publications

Contrasting water use strategies of beech trees along two hillslopes with different slope and climate

Contrasting water use strategies of beech trees along two hillslopes with different slope and climate

Introduction

The influence of hillslope topography on beech water use: a comparative study in two different climates

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