PJB-2018-313
PHOTOSYNTHETIC CHARACTERISTICS OF 12 SPECIES EPIPHYTIC FERNS OF POLYPODIACEAE
CHENDONG XU
Abstract
Epiphytic ferns play an important role in construction and maintain of biodiversity in forest ecosystem. To present the adaptability of physiological ecology on epiphytic ferns, the photosynthetic parameter of 12 species epiphytic ferns in Polypodiaceae were measured by LI-6400XT in Ailaoshan National Nature Reserve. Photoresponse curve was fitted by a new model and the interrelation between photosynthetic characteristics and ecological adaptability was analyzed. The result showed that light saturation of the 12 species epiphytic ferns is presented in the lower photo flux density. Phymatopsis integrifolia have a mild photoinhibition phenomenon and Polypodiastrum mengtzeense have a intense photoinhibition phenomenon, when photo flux density exceed the light saturation point, however, the rest of the epiphytic ferns have a light sleep phenomenon. 12 species of epiphytic ferns are divided into four ecological types which include type of heliophilous and intolerance of shade, type of heliophilous and shade-tolerance, type of shade-requiring and intolerance of shade, and the type of shade-requiring and shade-tolerance, according to light saturation point and light compensation point. There are different characteristics of distribution in the four ecological types.
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