期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2008
卷号：4
出版社：IOP Publishing
摘要：Two transpiration models were tested, one with evaporation control, and another
without evaporation control. The principle of the model with evaporation control
is that the physical mechanism of transpiration is evaporation, which is
actively controlled by plants. The supposed mechanism is: part of the heat (heat
equivalent to the energy absorbed from solar radiation) that would cause heating
of the plant above 25 °C is dissipated by evaporation. The model has four
physical parameters, which are in principle measurable independently. The model
without evaporation control is based on the assumption that evaporation
dissipates a constant fraction of the incoming solar radiation. In this model,
no physical mechanism of transpiration is given. The latter model needs only one
parameter, which can be found by means of parameter search. Both models were
tested by comparing their results with transpiration measured in the floodplain
forest growing along the bank of the Dyje River close to Pohansko (Moravia,
Czech Republic). Both models produced a typical difference of about 1.5 mm
d-1 between measured and calculated daily transpiration totals. We
can therefore say that both models are equally valid.
