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Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Jul 2010, 31 (4) BackGas exchange in Paulownia
species growing under different soil
moisture conditions in the field J.M.
Llano-Sotelo1, 1,2 3 Apdo. Postal 1819, (Received: Abstract: In order to evaluate their responses
to drought, we determined the photosynthetic activity, water potential, stomatal conductance, transpiration, water use efficiency,
photosynthetic photon flux density and leaf temperature of Paulownia
imperialis, P. fortunei and
P. elongata in three different soil moisture
conditions in the field. Our results showed that P. imperialis
had greater photosynthesis (8.86 ?mol CO2 m-2
s-1) and instantaneous water use efficiency (0.79 ?mol
CO2mmol H2O-1) than either P. elongata (8.20 ?mol CO2 m-2 s-1
and 0.71 ?mol CO2 mmol H2O-1)
or P. fortunei (3.26 ?mol CO2m-2 s-1and
0.07 ?mol CO2mmol H2O-1). The rapid growth of Paulownia did not appear to be correlated with
photosynthetic rates. Paulownia fortunei
showed more transpiration (48.78 mmol H2O
m-2? s-1) and stomatal conductance (840 mmol m-2? s-1) than P. imperialis (20 mmol H2O
m-2 s-1 and 540 mmol m-2 s-1)
and P. elongata (20 mmol? H2O m-2 ?s-1 and 410 mmol
m-2? s-1), which
allowed these two Paulownia species to increase their
tolerance to low soil moisture, and maintain higher water use efficiency under
these conditions. According to our physiological gas exchange field tests, Paulownia imperialis does appear
to be capable of successful growth in semiarid zones. Key
words: Paulownia,
Drought, Photosynthesis, Gas exchange, Stomatal
conductance ??????? PDF of full length paper
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