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This work is licensed under a Creative Commons Attribution 3.0 License.

Abstract

Increased drought frequency and severity are a pervasive global threat, yet the capacity of mesic temperate forests to maintain resilience in response to drought remains poorly understood. We deployed a throughfall removal experiment to simulate a once in a century drought in New Hampshire, USA, which coupled with the region-wide 2016 drought, intensified moisture stress beyond that experienced in the lifetimes of our study trees. To assess the sensitivity and threshold dynamics of two dominant northeastern tree genera (Quercus and Pinus), we monitored sap flux density (Js), leaf water potential and gas exchange, growth, and intrinsic water use efficiency (iWUE) for one pretreatment year (2015) and two treatment years (2016-17). Results showed that Js in pine (P. strobus) declined abruptly at a soil moisture threshold of 0.15 m3m-3 , while oak’s (Q. rubra and Q. velutina) threshold was 0.11 m3m-3 — a finding consistent with pine’s more isohydric strategy. Nevertheless, once oaks’ moisture threshold was surpassed, Js declined abruptly, suggesting that while oaks are well-adapted to moderate drought, they are highly susceptible to extreme drought. The radial growth reduction in response to the 2016 drought was more than twice as great for pine than for oaks (50% vs. 18% respectively). Despite relatively high precipitation in 2017, the oaks’ growth continued to decline (low recovery), whereas pine showed neutral (treatment) or improved (control) growth. iWUE increased in 2016 for both treatment and control pines, but only in treatment oaks. Notably, pines exhibited a significant linear relationship between iWUE and precipitation across years, whereas the oaks only showed a response during the driest conditions, further underscoring the different sensitivity thresholds for these species. Our results provide new insights into how interactions between temperate forest tree species’ contrasting physiologies and soil moisture thresholds influence their responses and resilience to extreme drought.

Department

Earth Systems Research Center

Publication Date

5-2021

Journal Title

Tree Physiology

Publisher

Oxford University Press

Digital Object Identifier (DOI)

10.1093/treephys/tpab056

Grant/Award Number and Agency

New Hampshire Agricultural Experiment Station (Accessions 1003450 and 1013351); Iola Hubbard Climate Endowment

Document Type

Article

Comments

This is a post-peer-review, pre-copyediting version of an article published in Tree Physiology, made available by the authors after a 12-month embargo period, in accordance with the copyright policy of Oxford University Press.

The final version is available from the publisher at: https://doi.org/10.1093/treephys/tpab056

Available for download on Wednesday, June 01, 2022

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