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- W2987686652 abstract "Abstract Notwithstanding its crucial importance for assessing the vulnerability of tropical mountain ecosystems to both local anthropogenic pressure and climate change, knowledge of the relationships between climate, hydrology, and vegetation on Mount Kilimanjaro is highly fragmentary. Unraveling the pathway of water from precipitation to transpiration can also help validate paleoclimate proxies derived from the hydrogen‐ and oxygen‐isotopic signatures of plant compounds, such as leaf waxes. We measured δ 2 H and δ 18 O in precipitation, stream, and soil water, and in xylem and leaf water of locally common plants, for four successive seasons along a 3,000‐m altitudinal transect covering lowland savannah, lower and upper montane forest, and the subalpine zone on Mount Kilimanjaro. Across all four bioclimatic zones, δ 2 H and δ 18 O in precipitation decreased with monthly precipitation amount at a rate of −8 ± 2‰ and −1.0 ± 0.3‰ per 100 mm, respectively. Our xylem‐water isotope data indicate that plants in general took up topsoil water during the northeasterly monsoon season and short dry season and gradually shifted to deeper soil water during the southeasterly monsoon season and the main dry season. Savannah trees and shrubs tapped from a water pool recharged by source water with a relatively constant isotopic signature. This observation conforms to the “two water worlds” hypothesis and implies a possible seasonal bias in plant‐derived paleohydrological proxies. Finally, our results show strong correlation between xylem‐to‐leaf water‐isotopic enrichment and ambient relative humidity, despite a bias in the savannah that we attribute to a leaf‐cooling mechanism in this warm, semi‐arid environment." @default.
- W2987686652 created "2019-11-22" @default.
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- W2987686652 date "2019-11-17" @default.
- W2987686652 modified "2023-10-16" @default.
- W2987686652 title "Water‐isotope ecohydrology of Mount Kilimanjaro" @default.
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- W2987686652 doi "https://doi.org/10.1002/eco.2171" @default.
- W2987686652 hasPublicationYear "2019" @default.
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