Study on Adaptation of Coastal Tree Species in the Haomeiliao Nature Preserve

• Main Authors: Jun-Teng Hsu, 徐浚騰
• Other Authors: Kuen-Yih Ho
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/62453603944330182706

碩士 === 國立嘉義大學 === 森林暨自然資源學系研究所 === 101 === Taiwan's coastal areas are mostly constructed with costal windbreaks by Casuarina spp., but due to the impact of global climate change, the reproductive environment conditions of costal windbreaks has been sorely tested, it is difficult to sustainable management; therefore, the restoration and tending strategies of costal windbreaks is more important. This study carried out the forest adaptability on and health assessment against the 21 band sample areas set for the costal windbreaks in Haomeiliao Nature Preserve. An investigation was conducted against the looks, patterns and extent of damage of trees, and from the analysis of principal components, there were five main factors affecting forestry health summarized as such index as canopy vigor, canopy transmittance, external biological hazards, reproductive ability, and mechanical damage. Total commonality of above five factors accounts for 76% of total variance, and weighted average factor scores (X ') of the threshold value of -0.86257, so take -0.9 as reference values for health research, because weighting factor scores (X ') after the standardized standard deviation value of 1. Therefore, the health status of the forest is divided into 5 levels, Level Ⅴ: x '> 2.1 is on the verge of death; Level Ⅳ: 1.1 ≤ x' <2.1 severe unhealthy; Level Ⅲ: 0.1 ≤ x '<1.1 moderate unhealthy; level Ⅱ: -0.9 ≤ x '≤ 0.1 for mildly ill health; LevelⅠ: x' <-0.9 the healthy. Finally all the trees by the weighting factor scores (X ') after cumulative average, by which we the health of tress in Haomeiliao Nature Preserve can be assessed to filter the suitable tree species. The analysis result of forest adaptability is that the Casuarina spp. shelterbelt still dominated in the first line; however, the tree layer remained 1,124±201 plants/ha only and the replanting operations should be carried out; as for in salt wetlands, Avicennia marina and Rhizophora mucronata had better adaptability, and a large of update seedling emerged; in the second-line shelterbelt, Cerbera manghas, Casuarina spp., Pongamia pinnata and Broussonetia papyrifera had higher adaptability. The assessment result of integrated forest adaptability shows that in the first-line shelterbelt, due to habitat conditions, Casuarina spp still dominated, or mixed with Hibiscus tiliaceus; for the salt wetlands afforestation, mangrove or semi-mangrove trees were appropriate; as for the second-line shelterbelt, apart from Casuarina spp, the costal species of better adaptability as Cerbera manghas, Pongamia pinnata, Broussonetia papyrifera, Melaleuca leucadendra, and Pittosporum pentandrum or other native species coast of Taiwan, can be selected in order to create a multi-storied forest, improving coastal windbreak efficiency, reducing management costs so as to achieve the goal of sustainable management of costal windbreaks.