Evapotranspiration from understory vegetation in an eastern Siberian boreal larch forest

Iida, S.; Ohta, Takeshi; Matsumoto, Kazuho; Nakai, T.; Kuwada, Takashi; Kononov, Alexander V.; Maximov, Trofim C.; Molen, M. K. van der; Dolman, A. J.; Tanaka, Hiroki; Yabuki, Hironori

doi:10.1016/j.agrformet.2009.02.003

Cited by 71 publications

(69 citation statements)

References 37 publications

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“…G s was calculated using the inverted Penman-Monteith equation (Iida et al, 2009) as (5) where β is the Bowen ratio. In this study, λE and β are achieved from eddy covariance measurements.…”

Section: Methodsmentioning

confidence: 99%

“…The McNaughton-Jarvis vegetationatmosphere decoupling coefficient (Ω) has been useful to indicate the relative importance of environmental and physiological factors in controlling dry-canopy ET (McNaughton and Jarvis, 1983). Many previous studies used Ω values for examining the environmental or physiological factors controlling ET worldwide (e.g., Wilson and Baldocchi, 2000;Kumagai et al, 2004;Kosugi et al, 2007;Iida et al, 2009;Jassal et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…AsiaFlux was established in 1999 as the Asian arm of the worldwide flux research network (FLUXNET) to measure energy, water vapour and CO 2 exchange in Asian region. Although AsiaFlux has been conducting the measurements of water vapour and energy exchanges in a variety of ecosystems, however, most of the studies have examined the seasonal and interannual variations in ET based on the data obtained at single site (e.g., Kumagai et al, 2004;Kosugi et al, 2007;Iida et al, 2009). Matsumoto et al (2008) investigated the ET characteristics at five forest sites of sub-arctic and temperate regions in East Asia.…”

Section: Introductionmentioning

confidence: 99%

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Spatial variations in evapotranspiration over East Asian forest sites. I. Evapotranspiration and decoupling coefficient

Khatun

Ohta

Kotani

et al. 2011

Hydrological Research Letters

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Abstract:Evapotranspiration (ET) is not only a vital component of water budget, but also plays an important role in the energy budget of the earth-atmospheric system, ultimately driving many regional and global scale climatological processes. This paper describes the ET characteristics and factors controlling ET across the 17 forest sites in East Asia (2°S to 64°N latitude). ET was measured using the eddy covariance technique at each site. Daytime dry-canopy data for the growing season were used in this study. Growing season mean ET gradually decreased as latitude increased, with a range of 4.4 to 1.2 mm d −1. The growing season mean decoupling coefficient (Ω) ranged from 0.42 to 0.11 across the studied sites. At low-latitude forest sites, Ω was close to 0.50, indicating that the bulk surface was partially decoupled from the atmosphere and ET was strongly controlled by net radiation and vapour pressure deficit. At high-latitude forest sites, Ω was low (~0.12), indicating that the bulk surface was well coupled to the atmosphere and ET was mainly controlled by surface conductance. The value of Ω was determined mainly by the ratio of aerodynamic conductance to surface conductance across the studied forests of East Asia.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial variations in evapotranspiration over East Asian forest sites. I. Evapotranspiration and decoupling coefficient

Khatun

Ohta

Kotani

et al. 2011

Hydrological Research Letters

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“…The canopy of the forest consists of L. cajanderi with a stand density of 840 trees ha −1 , leaf area index (LAI) of 1.56 and a mean tree height of approximately 18 m. The undergrowth consists mostly of cowberries (Vaccinium vitis idaea) (Ohta et al, 2008;Iida et al, 2009). The climate at the measurement site is classified as "Continental Subarctic climate with extremely severe winters (Dfd)" in the Köppen climate classification (Kottek et al, 2006), and the forest is underlaid by permafrost.…”

Section: Measurement Sitementioning

confidence: 99%

Terpenoid emissions from fully grown east Siberian <i>Larix cajanderi</i> trees

et al. 2013

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Abstract. While emissions of many biogenic volatile organic compounds (BVOCs), such as terpenoids, have been studied quite intensively in North American and Scandinavian boreal forests, the vast Siberian boreal forests have remained largely unexplored by experimental emission studies. In this study the shoot-scale terpenoid emission rates from two mature Larix cajanderi trees growing in their natural habitat in eastern Siberia were measured at the Spasskaya Pad flux measurement site (62°15´18.4" N, 129°37´07.9" E) located on the western bank of the Lena river. The measurements were conducted during three campaigns: 3–24 June, 8–26 July, and 14–30 August, in the summer of 2009. A dynamic flow-through enclosure technique was applied for adsorbent sampling, and the samples were analysed offline with a gas chromatograph. Between 29 and 45 samples were taken from each shoot during all three campaigns. Seven different monoterpenes, six different sesquiterpenes, linalool isoprene, and 2-methyl-3-buten-2-ol (MBO) were identified. The monthly median value of the total terpenoid emissions varied between 0.006 and 10.6 μg gdw−1 h−1. The emissions were dominated by monoterpenes, which constituted between 61 and 92% of the total emissions. About half of the monoterpene emissions were comprised of Δ 3-carene; α- and β-pinene had significant emissions as well. Linalool emissions were also substantial, comprising 3–37% of the total emissions, especially in June. Sesquiterpenes accounted for less than 3% and isoprene less than 1% of the total emissions. Based on the measured emission rates, the relative atmospheric concentration of each compound was estimated. Monoterpenes were the species with the highest relative concentration, while linalool and sesquiterpenes had a notably smaller contribution to the estimated atmospheric concentration than to the emission rates. A temperature-dependent pool algorithm with a constant β (0.09 °C−1 for monoterpenes and 0.143 °C−1 for sesquiterpenes) was used to normalize the measured emission data. For monoterpenes the emission potential varied between 0.5 and 18.5 μg gdw−1 h−1 and for sesquiterpenes between 0.02 and 0.4 μg gdw−1 h−1.

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“…The equation is characterized by ground surface resistance including the effect of understory vegetation. Kelliher et al (1997), Ohta et al (2001), and Iida et al (2009) reported that understory evapotranspiration reached 35̶52% of the total evapotranspiration in larch forests in eastern Siberia, and Yamazaki et al (2004) simulated understory evapotranspiration using this model. The water used for transpiration is withdrawn from the top three soil layers (0̶22 cm).…”

Section: Outline Of the Land Surface Modelmentioning

confidence: 99%

A Common Stomatal Parameter Set Used to Simulate the Energy and Water Balance over Boreal and Temperate Forests

Yamazaki

Katō

Ito³

et al. 2013

Journal of the Meteorological Society of Japan

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A parameter set expressing the potential response used to simulate evapotranspiration was inferred from pooled data of leaf-level stomatal conductance in the Far East. We used Jarvis-type parameterization, which consists of restriction terms of light, air dryness, temperature, and soil water. Two parameter sets, pooled common (PC) and within-site (WS) 273Corresponding author: Takeshi Yamazaki, Department of Geophysics, Graduate School of Science, Tohoku University, 6-3 Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan. E-mail: yamaz@wind.gp.tohoku.ac.jp ©2013, Meteorological Society of Japan sets, were determined using stomatal conductance data of eight species at nine sites. Seasonal changes of energy and water fluxes observed at four tower sites are well reproduced by a land surface model, despite using a different set of parameters. The results suggest that energy and water fluxes can be simulated using only one common parameter set with no parameter tuning, at least for forests in a wide region of the Far East.We discuss why similar fluxes were simulated using PC and WS parameters despite the clear differences between these two parameter sets. Sensitivity experiments showed that the effects of maximum stomatal conductance and soil water content mutually cancel each other in Yakutsk and that an optimum temperature effect was added.

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Evapotranspiration from understory vegetation in an eastern Siberian boreal larch forest

Cited by 71 publications

References 37 publications

Spatial variations in evapotranspiration over East Asian forest sites. I. Evapotranspiration and decoupling coefficient

Spatial variations in evapotranspiration over East Asian forest sites. I. Evapotranspiration and decoupling coefficient

Terpenoid emissions from fully grown east Siberian <i>Larix cajanderi</i> trees

A Common Stomatal Parameter Set Used to Simulate the Energy and Water Balance over Boreal and Temperate Forests

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Evapotranspiration from understory vegetation in an eastern Siberian boreal larch forest

Cited by 71 publications

References 37 publications

Spatial variations in evapotranspiration over East Asian forest sites. I. Evapotranspiration and decoupling coefficient

Spatial variations in evapotranspiration over East Asian forest sites. I. Evapotranspiration and decoupling coefficient

Terpenoid emissions from fully grown east Siberian &lt;i&gt;Larix cajanderi&lt;/i&gt; trees

A Common Stomatal Parameter Set Used to Simulate the Energy and Water Balance over Boreal and Temperate Forests

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Product

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About

Terpenoid emissions from fully grown east Siberian <i>Larix cajanderi</i> trees