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Xia L.,Southwest University | Xia L.,Chongqing Flower Engineering Technology Research Center | Zhao Z.-X.,Southwest University | Zhao Z.-X.,Chongqing Flower Engineering Technology Research Center | And 7 more authors.
Beijing Linye Daxue Xuebao/Journal of Beijing Forestry University | Year: 2011

Diurnal changes in the net photosynthetic rate (Pn) and transpiration rate (Tr) of Phoenix canariensis were studied using the Li-6400 photosynthesis system in mid-July of 2010. The relationship between Pn, Tr and environmental factors was analyzed by correlation coefficient analyses, path coefficient analyses and decision coefficient analyses for a purpose of providing a theoretical understanding of the photosynthetic physio-ecology of P. canariensis to facilitate the introduction and cultivation of this species. Diurnal changes of Pn had two peaks, occurring in the morning and afternoon, with a midday depression of photosynthesis. The reduction in Pn at midday originated from non-stomatal limiting factors. In contrast to Pn, Tr had only one peak. The light compensation point (LCP) was 34.30 μmol/(m2·s) and light saturation point (LSP) 1526.96 μmol/(m2·s), indicating that P. canariensis is a typical heliophyte. The apparent quantum yield (AQY) was 0.034. The direct impact of environmental factors on Pn occurred in the order of Ca > PAR > RH, and t1 > RH > PAR > Ca > Ci on Tr. Ca was the primary determining factor and RH the main limiting factor for Pn; while PAR was the primary determining factor and t1 the main limiting factor for Tr.

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