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Deciduous trees are a large and overlooked sink for snowmelt water in the boreal forest

Scientific Reports

By:
, , , , and
https://doi.org/10.1038/srep29504

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Abstract

The terrestrial water cycle contains large uncertainties that impact our understanding of water budgets and climate dynamics. Water storage is a key uncertainty in the boreal water budget, with tree water storage often ignored. The goal of this study is to quantify tree water content during the snowmelt and growing season periods for Alaskan and western Canadian boreal forests. Deciduous trees reached saturation between snowmelt and leaf-out, taking up 21–25% of the available snowmelt water, while coniferous trees removed <1%. We found that deciduous trees removed 17.8–20.9 billion m3 of snowmelt water, which is equivalent to 8.7–10.2% of the Yukon River’s annual discharge. Deciduous trees transpired 2–12% (0.4–2.2 billion m3) of the absorbed snowmelt water immediately after leaf-out, increasing favorable conditions for atmospheric convection, and an additional 10–30% (2.0–5.2 billion m3) between leaf-out and mid-summer. By 2100, boreal deciduous tree area is expected to increase by 1–15%, potentially resulting in an additional 0.3–3 billion m3 of snowmelt water removed from the soil per year. This study is the first to show that deciduous tree water uptake of snowmelt water represents a large but overlooked aspect of the water balance in boreal watersheds.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deciduous trees are a large and overlooked sink for snowmelt water in the boreal forest
Series title:
Scientific Reports
DOI:
10.1038/srep29504
Volume:
6
Year Published:
2016
Language:
English
Publisher:
Nature
Contributing office(s):
Alaska Science Center
Description:
Article 29504; 10 p.
First page:
1
Last page:
10