【作者】 何缘；

【导师】 林鹏； 张宜辉；

【作者基本信息】 厦门大学 ， 植物学， 2008， 硕士

【摘要】 本研究在全面分析国内红树林生态恢复的形势的基础上,针对厦门红树林生态恢复过程中存在的具体困难,从潮位、底质、有害生物等角度具体分析了厦门红树林生态恢复面临的困难。抓住影响红树植物苗木成活的关键因素:滩涂潮位太低,从成活率、生长、光合、营养积累、次生代谢物质等探讨了滩涂高程与红树植物苗木生长之间的关系;比较了不同种植模式(树种搭配、种植密度)等的生态恢复效果;探讨了红树林生态恢复过程中生态功能的变化。1.研究了滩涂高程对红树林生态恢复的影响研究,从理论上和实践上明确了滩涂高程是决定红树林造林成败的关键。在翔安样地滩涂设置7个高程样带,研究了不同高程对厦门主要红树林造林乡土种秋茄的影响。秋茄林的成活率、高度、冠幅和郁蔽度,以及林木年净生物量都与高程有显著关系。明确提出了厦门翔安红树林宜林滩涂高程。结果表明:秋茄的宜林滩涂高程要在黄海高程1.0 m以上。2.随着高程的增加,秋茄幼苗的光合电子传递速率、最大光合效率潜能(Fv/Fm)呈现出升高的趋势,非光化学淬灭系数表示(NPQ)逐渐下降。当高程低于0.6 m时,秋茄幼苗的光合效率低下,光破坏严重,淹水严重影响了秋茄幼苗的光合作用。当高程高于0.6 m时秋茄幼苗的光合活性没有受到太大影响,光合作用能正常进行。3.测定不同滩涂高程下1年生秋茄幼苗叶片单宁、C、N、叶绿素含量,研究了水淹胁迫对秋茄幼苗次生代谢物质单宁的影响及作用机理。结果表明,随着滩面高程的降低,光合能力下降,同化作用受到抑制,C/N及单宁含量降低,秋茄幼苗叶片中C、N含量及单宁含量对淹水胁迫的响应符合碳素/营养平衡假说。4.比较了不同种植模式和搭配种植的生态恢复效果。首先通过红树林的密植控制滩涂后,对1年生的秋茄幼苗进行疏伐,设置4种密度:(1)20 cm×20 cm;(2)30 cm×30 cm;(3)50 cm×50 cm;(4)100 cm×100 cm,以及三种搭配种植:(I)秋茄纯林;(2)无瓣海桑纯林;(3)秋茄、无瓣海桑及红海榄混种林。实验结果表明:疏伐密度50 cm×50 cm,秋茄生长最好,有利于迅速地改造为乔木群落,而秋茄、无瓣海桑及红海榄混种林生长最好,有助于提高幼苗成活率及恢复效果。5.研究了在既定区域的红树林生态恢复过程中,生物因子藤壶的附着对秋茄幼苗正常生长的影响,并对比研究了不同红树林区域内藤壶对人工红树幼苗的危害情况,揭示了藤壶在红树林区的附着和分布在数量上与样地高程、海水盐度及潮水速度的密切关系。研究结果表明浸淹深度大、海水盐度高、水流通畅的滩涂上藤壶危害严重,红树林幼苗倒伏率或死亡率明显增加。更多还原

【Abstract】 In this study, field experiments were carried out in Tongan bay, Xiamen, China. Kandelia candel seedlings were planted at various topographic sites in an intertidal zone of Tongan bay. The experimental plots were on a slop and showed a maximal elevation difference of 1.6 m. Seven experimental plots were set up in forest areas of intertidal zones. The plots were naturally submerged with 20-30‰saline water twice a day. Salinity, pH and the concentration of several ions in the soil were similar in all the plots. The survivalrate of propagules of Kandelia candel and the growth of its seedlings were measured every 3 months to find the critical tidal flats suitable for Kandelia candel. These findings would provide guideling information for appropriate tidal flats in a mangrove restoration program.Leaves of Kandelia candel planted in mangrove habitats along the intertidal gradient were collected from the Tongan bay. C, N and tannins concentrations and the photosynthestic performance of Kandelia candel in each sampling site were monitored. Responses of concentrations of C, N and tannins and the growth of Kandelia candel were study. It was predicted on the basis of carbon-nutrient balance (CNB) hypothesis that the concentrations of tannins would decline and the growth increase in response to waterlogging.Quantitative survey and research on barnacle species attaching to mangroves, the relationship between barnacle quantity and biological and ecological factors and barnacles harm to artificial young mangroves were studied. The aim of our study was to evaluate mangroves forestation in the intertidal and to develop a better understanding of factors influencing its regeneration. The results were showed as following.1. This study determined the effect of elevation on the survival and growth of mangrove seedlings during the establishment period. The results showed significant changes in growth and survival rate in response to topography. At 1.6 m of Huang sea-leval, Kandelia candel seedlings showed the best growth and the higest survival rate. Ascertain the critical tidal flats for Kandelia candel in Xiangan Bay, Xiamen. For Kandelia candel seedlings, the critical tidal elevation in Xiamen is 1.0 m of Huang sea-level.2. Electron transport rate (ETR) and maximal quantum yield of PSⅡphotochemistry (Fv/Fm) of Kandelia candel seedlings tended to increase with increasing elevation. While the tidal elevation is 0.2 m-0.6 m of Huang sea-leave, actual PSⅡof Kandelia candel seedlings is inefficient and photodamage is serious. The results showed that waterlogging have a great effect on photosynthesis. While the tidal elevation is more than 0.6 m, the photochemistry efficiency is normal.3. Different waterlogging durations of tidal immersion had different effects on the contents of C, N, tannins and Chlorophyll in leaves of Kandelia candel seedlings, which were planted at various topographic sites. Tannins concentrations and C/N ratios tended to decrease with decreasing elevation. The results showed that changes in C, N and tannins concentrations in response to waterlogging. This indicates that longer waterlogging time resulted in lower C/N ratios. The response of C, N and tannins in leaves to waterlogging was consistent with carbon-nutrient balance hypothesis.4. Kandelia candel communities for one year were thinned. Four thinning density were set up, which were 20 cm×20 cm, 30 cm×30 cm, 50 cm×50 cm and 100 cm×100 cm. Reveals the influences of the serial measures of thinning, the space of initial plantation should be properly close (50 cm×50 cm). Community thinned in a certain extent can increase their growth.5. The investigation on the barnacles attaching to the stems of Kandelia candel in the forest zone of Xiamen was carried out in September 2007. The results showed the barnacles quantity attaching to mangroves had positive correlation with their habitat seawater salinity, tide inundating depth and tide flooding ratio. Large scale of barnacles attaching to young mangrove tree reduced the increment of tree height and trunk diameter, caused tree trunk in deformation and even death.更多还原