- 期刊
台灣西南沿海地層下陷地區林木受害調查與適應性評估
A Study of Investigation and Improvement Suggestion on Land Subsidence in Southwest Coast of Taiwan
摘要
本研究針對台灣西南沿海地層下陷地區之海岸防風林內新植林木，進行了嘉義、台南等6處海岸防風林分的監測及評估。參考歐美國家對於森林適應監測所使用外觀形態變異評估，利用樹冠、葉片、枝條、樹皮和根部所顯現，林木遭受壓力之外觀形態變異評估，經因素分析將資料匯集成主要影響因素，結果發現西南沿海地層下陷地區影響新植林木適應性之主要因素，有樹冠活力、樹冠透視度、繁殖能力及機械損傷等4項主要成分，而這4個成份佔總變異數的75%以上，解釋地層下陷地區之海岸防風新植林木受害之能力相當高，結果顯示林木適應性評估多數樣區屬輕度及中度不適應等級，同時建構西南沿海地層下陷區鑑別函數，即當樹冠密度高於50%、樹冠透視度高於30%、樹冠枝枯低於20%及無開花，可作為評斷區林木屬於適應等級；而相對樹冠密度低於50%、透視度低於30%、樹冠枝枯高於20%及開花現象，可將樣區評為不適應等級，作為快速判視新植林木生長適應性之現場評估參考。
並列摘要
The windbreaks stand on land subsidence area in southwest of Taiwan. The 6 coastal windbreaks monitoring and evaluation points of coastal afforestation in Chiayi and Tainan. Reference to European and American countries for the use of forests to adapt to monitor the appearance of morphological variation of the assessment, the use of the crown of leaves, twigs, bark and roots are apparent, trees subjected to the pressure of the appearance of morphological variation assessment. The results of the analysis can be found in the southwest coastal subsidence adaptive regional influence of the 4 main factors of trees, including crown vitality, crown transmittance, reproductive capacity of plants and mechanical damage. The four components of the total variance of 75%, the majority of sample area classification belonged to the mild and moderately unhealthy levels, while construct the southwest coastal subsidence area discriminant function of tree growth for future reference adaptive management assessments. When crown density of more than 50%, crown perspective better than 30%, less than 20% canopy branches dry and non-flowering, can be used as trees are not suited to judge the district level; and the relative crown density of less than 50%, crown perspective is low at 30%, more than 20% crown branches dry and non-flowering phenomenon, can be kind of area as to adapt to grade, as a quick sentence, as the new adaptation of the growth of trees planted on-site assessment of the reference.