Bark water affects the isotopic composition of xylem water in tropical rainforest trees

Frontiers in Forests and Global Change, Journal Year: 2025, Volume and Issue: 7

Published: Jan. 28, 2025

The movement of water between xylem and inner bark (phloem associated tissues), mostly driven by potential differences, forms a key part the diel transpiration cycle. It is not known how use stored in at cycle may influence isotopic composition water. Understanding these possible effects major challenge for identification tree sources interpretation patterns using isotopes. Here, we examined variation scale assessed this varied relation to traits strategies on nine species tropical rainforest end dry season. We measured δ 2 H 18 O two shallow depths: ‘outer xylem’ ‘inner (up ~0.5 cm ~ 1 from bark, respectively) collected predawn, morning midday. Considering all together, average outer was similar predawn midday, suggesting exchange tissues reflected times, but differed significantly during increased transpiration. Results suggest that bark-xylem throughout affects trees. Furthermore, variations were more pronounced deep-rooted, isohydric with dense wood than shallow-rooted, anisohydric low density. This differences related hydraulic reliance bark-stored across buffer changes potential. discuss implications interpreting strategies.

Language: Английский

Cotton as a source of isotopic biases in extracted water via cryogenic vacuum extraction

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 132837 - 132837

Published: Feb. 1, 2025

Language: Английский