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  Evaporation from eastern Siberian larch forest

Kelliher, F. M., Hollinger, D. Y., Schulze, E.-D., Vygodskaya, N. N., Byers, J. N., Hunt, J. E., et al. (1997). Evaporation from eastern Siberian larch forest. Agricultural and Forest Meteorology, 85(3-4), 135-147.

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 Creators:
Kelliher, F. M., Author
Hollinger, D. Y., Author
Schulze, E.-D.1, Author           
Vygodskaya, N. N., Author
Byers, J. N., Author
Hunt, J. E., Author
Mcseveny, T. M., Author
Milukova, I., Author
Sogatchev, A., Author
Varlargin, A., Author
Ziegler, W., Author
Arneth, A., Author
Bauer, G., Author
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1External Organizations, ou_persistent22              

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Free keywords: Larch; Larix gmelinii; Total forest evaporation; Understorey evaporation
 Abstract: Total forest evaporation (λE), understorey evaporation, and environmental variables were measured on nine summer days under different weather conditions in a 130-year-old stand of Larix gmelinii (Rupr.) Rupr. trees located 160 km south of Yakutsk in eastern Siberia, Russia (61°N, 128°E, 300m above sea-level (a.s.l.)). Tree and broad-leaved understorey vegetation one-sided leaf area indices were 1.5 and 1.0, respectively. Agreement of λE and sensible heat flux (H), both measured by eddy covariance, and the available energy (Ra) was generally good: (H + λE) = 0.83 Ra + 9 W m−2 with r2 = 0.92 for 364 half-hour periods and the mean ± 95% confidence limit was 129 ± 17 for (H + λE) and 144 ± 19 for Ra. Daily E was 1.6–2.2 min, less than half of the potential evaporation rate and accounting for 31–50% of Ra, with the lowest percentage on clear days. A perusal of the sparse literature revealed that average daily E of boreal coniferous forest during the tree growing season (1.9 mm day−1 for this study) is relatively conservative, suggesting that low evaporation rates are a feature of this biome's energy balance. Using the Penman-Monteith equation, the maximum bulk-surface conductance (Gsmax) was 10 mm s−1. E and Gs were regulated by irradiance, air saturation deficit, and surface soil water content during a week-long dry period following 20 mm rainfall. From lysimeter measurements, 50% of E emanated from the understorey at a rate proportional to Ra. Based on the measurements and published climatological data, including average annual precipitation equal to 213 mm, water balance calculations indicated growing season forest E equal to 169 mm, the occurrence of a late summer-autumn soil water deficit, and annual runoff of 44 mm by snowmelt.

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 Dates: 1997
 Publication Status: Issued
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 Identifiers: Other: BGC0018
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Title: Agricultural and Forest Meteorology
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 85 (3-4) Sequence Number: - Start / End Page: 135 - 147 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954928468040
ISSN: 0168-1923