Photosynthetic Characteirstics And Leaf Anatomical Structure For Fifteen Potted Seedlings Common To Zhejiang Province

Pinus massoniana community was a forest community types in Zhejiang Province. Regulating and controlling the structure and component of Pinus massoniana monodominant was one of the important tasks of recovering the zonal forest vegetation of low mountains and hills area in subtropics. Besides, there existed the phenomenon that light resource had not been fully used in Pinus massoniana degraded community. Therefore, it needed to plant broadleaved tree species under Pinus massoniana degraded community, form multilayer structure to accelerate recovery process of zonal forest vegetation to promote progressive succession of Pinus massoniana community and enhance light use efficiency. Obviously, when broadleaved tree species were planted, we should not only analyse the illumination characteristic but also compare their light acclimation so that important basis was provided for reasonable allocation.In this thesis, diurnal changes of photosynthesis and light response characteristics for fifteen potted seedlings common to Zhejiang Province were measured by LI-6400portable photosynthesis system. Paraffin section was made by common method, then it was observed Olympus microscope. After extracting chlorophyll with80%acetone in the dark, the leach liquor was scaned by spectrophotometer. We used principal component analysis method for the comprehensive evaluation of light use ability, then ordered the results which showed that:(1)The order of average of the net photosynthetic rate (Pn), stomatal conductance(Cond), and transpiration rate(Tr) for coniferous species was Pinus massoniana> Taxus chinensis>Metasequoia glyptostroboides. The order of average of Pn for the nine broadleaf tree species was Sapium sebiferum> Elaeocarpus decipiens> Schima superba> Lithocarpus glaber> Quercus phillyraeoides> Lithocarpus harlandii> Phoebe chekiangensis> Castanopsis sclerophylla> Podocarpus nagi. Lespedeza formosa had the highest Pn and Tr in May, July, October,, and the average. The order of average of LUE for the nine broadleaf tree species was Sapium sebiferum> Elaeocarpus decipiens> Schima superba> Lithocarpus glaber> Lithocarpus harlandii> Quercus phillyraeoides> Phoebe chekiangensis> Castanopsis sclerophylla> Podocarpus nagi. Loropetalum chinense had the highest LUE in December, while Lespedeza formosa had the highest for other months and the average.(2)Pinus massoniana had the highest Pn in May, July, October, and December, so it could use highlight effectively. The order of light compensation point(LCP) in the four months for three shrub species was Metasequoia glyptostroboides> Taxus chinensis> Pinus massoniana. The Pn of nine broadleaf tree species was higher in May, July and October, than in December. Quercus phillyraeoides had the highest LSP in May and July and so did Phoebe chekiangensis in October and Castanopsis sclerophylla in December. Besides, Castanopsis sclerophylla had the highest LCP in May and October, and so did Podocarpus nagi in December. Lespedeza formosa which had the highest LSP in May, July and October had strong ability of using high light.(3)The cluster analysis for leaf anatomical structure showed that Podocarpus nagi was one kind of tree species. Pinus massoniana belonged to one kind of tree species. Sapiums ebiferum, Photinia×fraseri, Castanopsis sclerophylla, Quercus phillyraeoides were classified as one kind of tree species; while Lithocarpus harlandii, Lespedeza formosa, Phoebe chekiangensis, Elaeocarpus decipiens, Schima superba, Metasequoia glyptostroboides, Taxus chinensis, Lithocarpus glaber, Loropetalum chinense were classified as one kind of tree species.(4)The cluster analysis for chlorophyll (a+b) content and chlorophyll a/b of fifteen tree species showed that Pinus massoniana and Castanopsis sclerophylla were one kind of tree species, and Lespedeza formosa belonged to one kind of tree species. Elaeocarpus decipiens, Phoebe chekiangensis, Podocarpus nagi, Metasequoia glyptostroboides, Lithocarpus glaber, Schima superba, Lithocarpus harlandii, Loropetalum chinense, Sapium sebiferum, Taxus chinensis, Quercus phillyraeoides, Photinia×fraseri were classified as one kind of tree species.(5)The cluster analysis for comprehensive evaluation of light use ability showed that Castanopsis sclerophylla was the tree which could use light energy the most powerfully; Metasequoia glyptostroboides, Schima superba, Lespedeza formosa, Pinus massoniana, Quercus phillyraeoides, Sapium sebiferum were one kind of tree species which could use light energy powerfully; while Elaeocarpus decipiens, Phoebe chekiangensis, Lithocarpus glaber, Podocarpus nagi, Lithocarpus harlandii, Taxus chinensis, Photinia×fraseri, Loropetalum chinense were classified as one kind of tree species which had the characteristic of shade-tolerant.The results which on the basis of photosynthetic characteristics, leaf anatomical structure and comprehensive evaluation for fifteen potted seedlings could be used not only in the process of reasonable allocation of tree species to improve the use efficiency of surplus light resource but also in the vegetative recovery process and community structure optimization for the hilly area of Zhejiang Province.