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首页> 外文OA文献 >The Erosion of Coastal Sediment and Regeneration of Rhizophora mangle Following Anthropogenic Disturbance on Turneffe Atoll, Belize
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The Erosion of Coastal Sediment and Regeneration of Rhizophora mangle Following Anthropogenic Disturbance on Turneffe Atoll, Belize

机译：伯利兹土耳其环礁人为干扰后沿海沉积物的侵蚀和Rhizophora mangle的再生

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摘要

As communities and managers become aware of the long-term impacts of mangrove loss, estimated at 1-2% per year, interest in sediment erosion and mangrove rehabilitation has increased substantially. In this thesis project I 1) examine erosion rates within coastal fringing Rhizophora mangle ecosystems following mangrove clearing and compare these rates to accretion rates in intact mangroves; and 2) investigate the abiotic factors influencing mangrove seedling survival and regeneration of naturally colonizing R. mangle, in historic mangrove habitat after anthropogenic clearing.Differences in erosion were compared between patches of open-coast intact and anthropogenically cleared R. mangle to quantify the sediment trapping function provided by mangroves and its loss following clearing over a 24 month period. Growth rates of mangrove seedlings in intact forest were compared to seedlings in cleared areas. Seedling growth indicators were measured on 100 seedlings at five sites (50 in the intact and 50 in the cleared areas). To examine the limiting factors on seedling growth rates, nutrient addition and wave protection treatments were applied to seedlings in three disturbed areas.Sites within intact mangroves had sediment accretion (M= +3.83 mm) while areas cleared of mangroves had sediment erosion (M= -7.30 mm). Seedling growth (height) over the 2 year study period significantly differed between intact mangrove (M = 15.6 cm) and cleared (M = 10.24 cm) areas. Seedling mortality from the cleared areas (31%) differed from the intact areas (13%). Average seedling growth (height) was: greater with both nutrient/wave (M = 18.4 cm) and nutrient (M = 17.65 cm) treatments compared to controls (M = 10.8 cm), which suggests that providing nutrients and/or wave protection result in growth outputs comparable to seedlings found in intact mangroves.This study may prove to be useful in identifying areas that are most vulnerable to erosion following mangrove removal and ideal location of restoration following mangrove removal. Areas cleared of mangroves can lead to intensified erosion in areas where fringing reefs are not continuous. When managers are determining areas to focus resources for restoration, focusing on areas with nutrient rich habitat may result in higher survival rates and growth outputs.
机译：随着社区和管理者意识到红树林流失的长期影响（估计为每年1-2％），人们对泥沙侵蚀和红树林恢复的兴趣大大增加。在本论文项目中，我1）研究红树林砍伐后沿海边缘根瘤菌（Rhizophora mangle）生态系统的侵蚀速率，并将其与完整红树林的增生速率进行比较； 2）研究人为清除后历史红树林生境中影响红树林自然定居的红树林幼苗存活和再生的非生物因素。比较了裸露的完整海岸和人为清除的红树林之间的侵蚀差异以定量沉积物红树林提供的诱集功能及其在24个月内清除后的损失。将原始森林中红树林幼苗的生长速率与原始地区中的红树林幼苗的生长速率进行了比较。在五个地点（完整的50处和空旷的区域50处）的100棵幼苗上测量了幼苗生长指标。为了检查影响幼苗生长速率的限制因素，对三个受干扰地区的幼苗进行了营养添加和防波处理。完整红树林内的站点沉积物增加（M = +3.83 mm），而清除红树林的区域发生了沉积物侵蚀（M = -7.30毫米）。在2年研究期内，完整红树林（M = 15.6 cm）和未砍伐（M = 10.24 cm）区域的幼苗生长（高度）明显不同。清除区的幼苗死亡率（31％）与完整区的幼苗死亡率（13％）不同。平均养分生长（高度）为：与对照（M = 10.8 cm）相比，在施肥/施肥（M = 18.4 cm）和施施施肥（M = 17.65 cm）时均更大，这表明提供施肥和/或施肥保护效果这项研究可用于确定最容易遭受红树林去除后侵蚀的地区以及理想的恢复位置。在边缘礁不连续的地区，清除红树林的区域可能导致加剧的侵蚀。当管理人员确定要集中资源进行恢复的区域时，将重点放在栖息地营养丰富的区域可能会提高生存率和增长产出。

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    Hayden Heather Lyn;

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  • 年度 2015
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