| Summary: | 碩士 === 國立東華大學 === 自然資源管理研究所 === 86 === The effect of nutrients on the growth of dwarf Kandelia candel in the Chuwei mangrove swamp was studied. In addition to the field fertilization experiment, seasonal changes of nutrient content in leaf tissues, soil and water in the swamp were also examined in this study. Growth parameters, i.e., tree height, canopy diameter, number and length of young shoots, and the N and P content in leaf tissues were significantly increased in fertilization treatments containing nitrogen. No difference was found between phosphorus and control treatments. This indicates that nitrogen is the nutrient limiting factor for the growth of dwarf K. candel in the Chuwei mangrove swamp. According to the analyses of nutrients in the hydrological environment, inorganic nitrogen and organic matters in the inundation tide could be the main nitrogen sources for the swamp. Therefore, frequency and duration of tidal inundation not only affect the nitrogen supplement to the swamp, indirectly, also affect the texture composition and chemical properties in the soil. The elevation of the area where the dwarf forest grows in the Chuwei mangrove swamp is higher than the average height of high tide. This differs from the tidal creek forest whose height of growing area is lower than the average height of high tide. Therefore, the frequency discrepancy of tidal inundation is probably the reason of nutrient distribution causing difference in growth response between the dwarf and tidal creek forest. The damage caused by typhoon on plant, and the difference in burrowing activity of crabs between the dwarf and tidal creek areas could also be some important effects to limit the growth of K. candel and the deficiency of N in the dwarf forest area in the Chuwei mangrove swamp.
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