臺灣博碩士論文加值系統

任何保育計畫的擬定必須建立在詳實而基礎的生物學研究上。本文就鵝鑾鼻野百合此一侷限特有種的生物特性做一初步之調查研究，發現在兩種不同生育地之植株形值差異並不顯著，但是在生殖狀態的表現上有明顯的差異。91.2%的個體生殖枝條數多在30根以下，每枝條平均花苞數多為兩個以下(72.8%)，三個花苞的佔21.2%，每枝條盛開的花以單花和雙花為絕大多數(85.6%)，每枝條成熟莢果亦以兩個以下為主(92.8%)；整體而言，在生殖表現上，風吹沙生育地的植株明顯較草原生育地好，加上遺傳結構變異之分析，得知鵝鑾鼻野百合族群間之遺傳相似性極大(＞0.989)，可見生殖狀態之表現受環境因素所影響。以逢機度測驗檢視族群之分佈模式，和幼苗之密度、生殖潛能的表現，發現草原生育地之植株呈現集落分佈之模式，顯示族群之建立受崩塌地之形成所影響，風吹沙生育地之植株則無此項限制。
鵝鑾鼻野百合的生殖季節以十月到翌年六月之乾旱季為主，應與雨量之分佈有關。其交配系統為混合式，兼具自花授粉和異花可稔的特性，所佔比例如何需要進一步研究，但可以解釋其遺傳歧異度較一般侷限種或純自花受粉者為高。其族群生存之壓力受族群更新受限、生育地減少和偶發之災難事件等因素所影響，建議將其保護地位從易受害提升至瀕臨滅絕，並進行適當之保育措施，以維護其族群之延續與共存特有生態系之完整。

This is a preliminary biological study of Crotalaria similis Hemsl., an endemic species restricted to the Hengchun Peninsula of Taiwan. Based on the populations from two different habitats, no significant morphological differences between them are present while they are quite distinct in reproductive biology. On the basis of all examined samples, mostly (91.2%) less than 30 reproductive shoots present on each individual. In general, around 85.6% of individuals have inflorescence with unique or two flowers while 92.8% of them bear less than two pods. Generally, the plants from sandy substrate (Fong-Chuei-Sha) have higher fecundity than that from grassland (Long-Pang). It is believed to be affected by environmental factors because genetic identity is extremely high between plants from different habitats. According to the dispersion pattern (contagious dispersion) in grassland, density of seedlings and reproductive potential, I suspect that the establishment of the populations at grassland were affected by formation of karst topography. However, the populations on sandy substrate were not confined by these factors. Flowering period is mostly in October through June and correlated with the distribution of rainfall. The mating system carries both autogamy and facultative xenogamy; therefore, it is rational that the genetic heterogeneity of this species is higher than most endemic plants with limited distribution or autogamy plants. Since the survival of Crotalaria similis is threatened by low recruitment, habitat alternation and stochastic events, I would like to suggest to elevate the conservation status of this species from "vulnerable" to "endangered". Moreover, it is recommended to proceed promising conservation actions to preserve the unique grassland at Long-Pang and sandy habitat at Fong-Chuei-Sha for sustainment of this endangered species.