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Experimental study of the short-term fluctuations of net photosynthesis rate of Norway spruce needles under field conditionsстатья
- Авторы: Bolondinsky V., Oltchev A., Jin H.O., Joo Y.T., Chung D.J.
- Журнал: Journal of Korean Forest Society
- Том: 88
- Номер: 1
- Год издания: 1999
- Первая страница: 38
- Последняя страница: 46
- Аннотация: Canopy stomatal conductances of a Norway spruce forest in the Soiling Hills (Central Germany) and Central Forest Biosphere Reserve (320km to the north-west from Moscow) were derived from LE (Latent heat flux) and H (sensible heat flux) fluxes measured(by Eddy correlation technique and energy balance method) and modeled (by one dimensional non-steady-state) SVAT (soil-vegetation-atmosphere-transfer) model (SLODSVAT) using a rearranged Penman-Monteith equation ("Big-leaf" approximation) during June 1996. They were compared with canopy stomatal conductances estimated by consecutive inter- grating the stomatal conductance of individual needles over the whole canopy ("bottom-up" approach) using SLODSVAT model. The result indicate a significant difference between the canopy surface conductances derived from measured and modeled fluxes ("top-down" approach) and the stomatal conductances modeled by the SLODSVAT ("bottom-up" approach). This difference was influenced by some non-physiological factors within the forest canopy(e.g. aerodynamic and boundary layer resistances, radiation budget, evapotranspiration from the forest understorey). In general, canopy surface conductances derived from mea¬sured and modeled fluxes exceeded canopy stomatal conductance during the whole modeled period. The contribution of the understorey's evapotranspiration to the total forest evapotranspiration was small (up to 5 9% of the total LE flux) and was not depended on total radiation balance of forest canopy. Ignoring contribution of the understorey's evapotranspiration resulted in an overestimation of the cano¬py surface conductance for a spruce forest up to 2mm/s (about 10 -15%).
- Добавил в систему: Ольчев Александр Валентинович