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- Title
Evidence for variations in cryogenic extraction deuterium biases of plant xylem water across foundational northeastern US trees.
- Authors
Sobota, Matthew; Li, Kevin; Hren, Michael; Knighton, James
- Abstract
Measurements of oxygen and hydrogen isotopes in plant xylem water (2H, 18O) have helped to redefine conceptual and numerical models of the hydrological cycle and understand how plants compete for subsurface water. Recent experiments have shown that Cryogenic Vacuum Extraction (CVE) of plant xylem water can result in a δ2H bias. We tested if CVE δ2H‐biases varied significantly across seven foundational northeastern US forest trees with a series of tree core rehydration experiments. Our analysis demonstrated that CVE δ2H‐biases were well predicted by sample gravimetric water content and varied significantly with tree species identity. We show that species‐level δ2H‐bias corrections can result in substantially different understandings of plant water uptake and transpiration versus uncorrected data or generic bias corrections. This research demonstrates an urgent need for the critical evaluation of CVE for plant water extraction. In the absence of a stronger understanding of CVE δ2H‐biases, we recommend that xylem water δ2H observations should not be used in plant water uptake studies.
- Subjects
PLANT-water relationships; DEUTERIUM; AQUATIC plants; HYDROGEN isotopes; HYDROLOGIC cycle; OXYGEN isotopes
- Publication
Hydrological Processes, 2024, Vol 38, Issue 2, p1
- ISSN
0885-6087
- Publication type
Article
- DOI
10.1002/hyp.15079