Seasonal variations in soil–plant interactions in contrasting urban green spaces: Insights from water stable isotopes

Marx, Christiane; Tetzlaff, D.; Hinkelmann, Reinhard; Soulsby, Chris

doi:10.1016/j.jhydrol.2022.127998

Cited by 18 publications

(10 citation statements)

References 91 publications

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“…For all samples, including three standards (normalized to VSMOW), the isotopic composition was measured using a Los Gatos Research Integrated Cavity Output Spectroscopy (OA‐ICOS) Analyser (LGR, TIWA‐45‐EP, San Jose, CA, precision: 0.2 and 0.05‰ for δ 2 H and δ 18 O, respectively). For a detailed description of measurements see Marx et al (in review).…”

Section: Methodsmentioning

confidence: 99%

Estimates of water partitioning in complex urban landscapes with isotope‐aided ecohydrological modelling

Gillefalk

Tetzlaff

Marx

et al. 2022

Hydrological Processes

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Urban green space is increasingly viewed as essential infrastructure to build resilience to climate change by retaining water in the city landscape and balancing ecohydrological partitioning into evapotranspiration for cooling and groundwater recharge. Quantifying how different vegetation types affect water partitioning is essential for future management, but paucity of data and the complex heterogeneity of urban areas make water balance estimates challenging. Here, we provide a preliminary assessment of water partitioning from different sized patches of trees and grass as well as from sealed surfaces. To do this, we used limited field observations together with an advanced, process‐based tracer‐aided ecohydrological model at a meso‐scale (5 km2) in central Berlin, Germany. Transpiration was the dominant green water flux accounting for over 50% of evapotranspiration in the modelled area. Green water fluxes were in general greater from trees compared with grass, but grass in large parks transpired more water compared with grass in small parks that were intensively used for recreation. Interception evaporation was larger for trees compared with grass, but soil water evaporation was greater for grass compared with trees. We also show that evapotranspiration from tree‐covered areas comprise almost 80% of the total evapotranspiration from the whole model domain while making up less than 30% of the surface cover. The results form an important stepping‐stone towards further upscaling over larger areas and highlights the importance of continuous high‐resolution hydrological measurements in the urban landscape, as well as the need for improvements to ecohydrological models to capture important urban processes.

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Section: Methodsmentioning

confidence: 99%

Estimates of water partitioning in complex urban landscapes with isotope‐aided ecohydrological modelling

Gillefalk

Tetzlaff

Marx

et al. 2022

Hydrological Processes

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show abstract

“…Using it for soil water instead of stream water is a coarse, but still useful, method to investigate dynamics rather than comparing absolute values (von Freyberg et al, 2018). In interpreting results, the potential effects of evaporative fraction on soil water isotopes needs to be borne in mind (Marx et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Using stable water isotopes to understand ecohydrological partitioning under contrasting land uses in a drought‐sensitive rural, lowland catchment

Landgraf

Tetzlaff

et al. 2022

Hydrological Processes

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Vegetation plays an essential role in water partitioning, as it strongly influences evapotranspiration, infiltration and water retention. To analyse the influence of vegetation on water partitioning under innovative land management strategies, we used stable water isotopes as natural tracers to monitor precipitation, soil water and groundwater fluxes over the growing season of 2021 (March–October). We selected eight plot sites with four contrasting land covers and soil types in the drought‐sensitive Demnitzer Millcreek Catchment (DMC) in NE Germany. The land use types include forest, grassland, and arable with the latter being subdivided into conventional (e.g., crops) and innovative (e.g., agroforestry) sites. Two weather stations, a flux tower, and in situ soil moisture monitoring complemented our isotopic data with a hydroclimatic context. The year of 2021 had near‐normal precipitation totals compared to the prolonged drought of 2018–20. Soil water storage was highest at the agricultural sites, while lowest at the forest, though this reflected both the influence of soil properties (as forests dominated sand soils while crops loam soils) and the greater evapotranspiration from forests. We also estimated soil water ages and found the greatest isotopic variability and fastest turnover of water in the upper soils of arable sites. The forest soil water had the most limited variability in isotopic composition and tended to be older, revealing lower levels of groundwater recharge. Conventional and innovative cropping sites were similar to each other, likely due to the early tree development stage in agroforestry schemes under the latter. Our investigation revealed the forest sites are potentially most vulnerable to limited water availability in the DMC and land use changes in agricultural land lacked major differences in ecohydrological fluxes over the study year. The study further underlines the need for long‐term observations of recent adaptive land use changes and drought‐sensitive vegetation to improve our understanding and evolve drought resilient land management strategies considering time lags in impacts and non‐stationarity.

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“…2c) in May, July and August 2019, with three replicate samplings per vegetation type and month. Further, over the 2020 growing season, bulk soil water isotope samples were taken at three depths (0 -5 cm, 5 -15 cm, 15 -25 cm) under grassland and trees in three parks in the city centre (Marx et al, 2022;Fig. 2b).…”

Section: Tablementioning

confidence: 99%

The imprint of hydroclimate, urbanization and catchment connectivity on the stable isotope dynamics of a large river in Berlin, Germany

Kuhlemann

Tetzlaff

Marx

et al. 2022

Journal of Hydrology

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Seasonal variations in soil–plant interactions in contrasting urban green spaces: Insights from water stable isotopes

Cited by 18 publications

References 91 publications

Estimates of water partitioning in complex urban landscapes with isotope‐aided ecohydrological modelling

Estimates of water partitioning in complex urban landscapes with isotope‐aided ecohydrological modelling

Using stable water isotopes to understand ecohydrological partitioning under contrasting land uses in a drought‐sensitive rural, lowland catchment

The imprint of hydroclimate, urbanization and catchment connectivity on the stable isotope dynamics of a large river in Berlin, Germany

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