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- W2267408054 abstract "Understanding the shade-tolerance ability of a species is crucial for the successful tending of young seedlings and selecting forestation species. Yet, no systematic investigations about the shade tolerance of native tree species have been carried out so far by foresters in Taiwan. In this study, we cultivated numerous seedlings of native broadleaf tree species in a nursery at National Pingtung University of Science and Technology. We measured the photosynthetic capacity (A_(max)) of 180 species during the rainy seasons of 2009~2014. The quantified data were applied as a physiological index for determining the shade-tolerance ability of a species and thereby classifying the species into 5 different shade-tolerance levels. To validate the suitability of this application, 6 experts of dendrology with years of field experience were asked to fill out a questionnaire for the tested species. The questionnaire inquired about the most likely light environment for natural recruits of each species. Then we compared the A_(max) results with the experts' opinions. Results showed that Amax of the 180 species ranged 35.8~9.1 μmol CO2 m-2 s-1; the first 5 species with the highest A_(max) values included "Hibiscus taiwanensis", "Melia azedarach", "Mallotus japonicas", "Hibiscus tiliaceus", and "Broussonetia papyrifera", while "Garcinia subelliptica" showed the lowest. With reference to the experts' opinions, we divided Amax into 5 levels: ≧ 26.0, 25.9~21.0, 20.9~15.0, 14.9~12.5, and < 12.5 μmol CO_2 m^(-2) s^(-1), corresponding to shade-tolerance levels 1, 2, 3, 4, and 5 (namely very intolerant, intolerant, moderately tolerant, tolerant, and very tolerant). By the Amax classification, numbers of species belonging to levels 1 to 5 were 18, 37, 70, 33, and 22; while according to the experts' opinions, respective numbers were 21, 52, 63, 40, and 4. Few species were considered to be very tolerant by the experts. The 2 sets of results showed a significant positive relationship with a Pearson's correlation coefficient of 0.92. Out of the 180 species, 131 (73%) species were classified into the same level by the 2 methods, and 49 species showed only 1 rank difference. Thus, employing Amax to classify the shade tolerance of subtropical broadleaf tree species is objective and practical. With these physiological data, we have established a database of shade-tolerance levels of subtropical broadleaf tree species of Taiwan. It provides references for forestation, ecological restoration, and ornamental applications." @default.
- W2267408054 created "2016-06-24" @default.
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- W2267408054 date "2015-12-01" @default.
- W2267408054 modified "2023-09-28" @default.
- W2267408054 title "Photosynthetic Capacity and Shade Tolerance of 180 Native Broadleaf Tree Species in Taiwan" @default.
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