碩士 / 國立中興大學 / 森林學系所 / 96 / In order to improve the stand structure of Casuarina pure stand, many scholars proposed the building of multi-storied stand to obtain the purpose of stabilizing the seacoast forest stand. This study discussed the physiology response of Cerbera manghas, Eriobotrya deflexa f. koshunensis and Podocarpus costalis having different ecology habit to different light intensity by different artificial treatment of shading, to provide the reference of the tree species selecting when building multi-storied stand in different gaps.
The experiment results indicate that C. manghas in each light treatment having the greater net height growth and basal diameter growth, the maximum value were 29 cm and 6 mm respectively; P. costalis shows the lower growth. The change of morphology of single leaf, E. deflexa f. koshunensis shows the highest morphology plasticity. The characteristic of photosynthesis indicate that light saturation point of three species seedling growthing under full sunlight were between 700〜900 μmol photon m-2 s-1, and the seedlings of C. manghas and E. deflexa f. koshunensis growthing under full sunlight show greater maximum photosynthetic rate were 10.26 and 10.78 μmol CO2 m-2 s-1 respectively. The part of diurnalvariation of chlorophyll fluorescence indicate that three species seedling growthing under full sunlight were all show that suffering photoinhibition obviously, and their midday value of Fv/Fm and ΦPSⅡat were below 0.75 and 0.70 respectively . The result of artificial lighting-induced photoinhibition indicate that in each species seedling growthing under 5 % full sunlight, C. manghas has better ability of enduring high light and adjustment, their energy allocation of photochemical quenching could maintain about 0.5 at the strongest light intensity level. The result of spectral reflectance indicate that seedling growing under high light of C. manghas and P. costalis had higher xanthophyll cycle level, their value of PRI were about -0.15. The part of leaf pigment indicate that P. costalis shows the highest physiological plasticity.
Summarizing the above result, C. manghas shows the characteristic of shade-tolerant tree species, being suitable for planting at the gaps of beefwood stand which light intensity were between 5〜40 % full sunlight; E. deflexa f. koshunensis and P. costalis having better plasticity of physiology and morphology, could adaptate much different light environment, being suitable for planting at the gaps or edge of beefwood stand which light intensity were between 40〜60 % full sunlight.
| Identifer | oai:union.ndltd.org:TW/096NCHU5360021 |
| Date | January 2008 |
| Creators | Li-Shiun Shiu, 許立勳 |
| Contributors | 廖天賜 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 77 |
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