碩士 / 國立中興大學 / 森林學系所 / 100 / Abstract
The aim of this study was to understand the relationship between concentrations of heavy metals in Avicennia marina and in the soil and the heavy metals accumulation pattern in tissues of Avicennia marina at different growth stage.
Experiments were divided to two parts: (1) field base investigation and (2) greenhouse experiment. Field base investigation was to understand the distribution of soil heavy metals in Jishuei River, Sihcao mangrove protected area A2 and A3 zone, Sihkunshen and Erren River of southwestern Taiwan and to figure out the effect of soil heavy metals concentration gradient on Avicennia marina seedlings growth and its soil. In greenhouse experiment, self-made tidal simulator was used to simulate the real tide with different concentrations of lead and copper and to test their effects on Avicennia marina seedlings growth and on soil property.
Results showed that the soils of rhizosphere of Avicennia marina could accumulate high concentrations of heavy metals. In field base investigation, heavy metal concentrations of the soil of rhizophere was 1.5 times that of non-rhizophere on Erren River. In greenhouse experiment, highest heavy metals treatment caused Pb and Cu concentration of soils 606.33 μg/g and 605.10 μg/g respectively, which were 15 times the untreatment. It meaned that the mangrove ecosystem with Avicennia marina, could retain the heavy metal ions in river water and reduced heavy metal pollution diffused to adjacent ecosystems. The pattern of heavy metal accumulation of Avicennia marina seedlings showed that heavy metals accumulated mainly in roots. Heavy metal concentrations of roots were approximately 2 times those of leaves, thereby reduced the upward transport of heavy metals which affected its physiology, and also regulated this essential heavy metals upward transport and suppressed the upward transport of non-essential elements.
High concentrations of heavy metals reduced dry weight, height, diameter, the number of expanded leaves and other growth parameters of Avicennia marina seedlings significantly, indicating that the concentration of heavy metal pollution in the soil could be harmful to the growth of Avicennia marina seeldings, but still in the range of tolerance.
In this study, field base investgation and greenhouse experiments could meet each other, and through understanding accumulation and distribution of heavy metals in Avicennia marina and in its soil, confired that in phytoremediation, Avicennia marina could be used as a good phytostabiliser to reduce the mobility of heavy metals pollution to decrease spreading.
| Identifer | oai:union.ndltd.org:TW/100NCHU5360002 |
| Date | January 2012 |
| Creators | Yi-Chun Liu, 劉怡君 |
| Contributors | 顏江河 |
| 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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