瀕危植物-竹柏種子之儲藏及發芽

竹柏（Negia nagi）樹形優美、生長緩慢，在野外屬於稀有植物種類。本試驗利用採自林業試驗所港口工作站23年生之竹柏母樹種子進行種子發芽和儲藏試驗。新鮮竹柏種子在25℃處理下第8週累加發芽率為62.2%，30/20℃變溫處理之發芽率高於25℃定溫處理，為95.6%。觀察發芽試驗期間，5℃層積10個月之種子，在30/20℃下，第6週發芽率即達98.9%；在25℃下，第8週更可達到100％發芽率；未做任何層積處理的種子，達到90％發芽率需要12週。竹柏種子不論是新鮮或低溫層積10個月，皆可維持原來種子高發芽的活力。尤其種子在低溫層積10個月後，能縮短發芽時間且使種子發芽整齊。Negia nagi boasts a graceful tree form and slow growth rate, and is categorized as a rare wild plant species. This experiment conducted seed germination and storage trials using seeds harvested from a 23-year-old mother tree of N. nagi at the Port Workstation of the Forestry Experiment Institute. For fresh N. nagi seeds, the cumulative germination rate reached 62.2% at the 8th week under a constant temperature of 25℃. The germination rate under the 30/20℃ alternating temperature treatment was higher than that of the 25℃ constant temperature treatment, reaching 95.6%. During the germination test, seeds stratified at 5℃ for 10 months achieved a germination rate of 98.9% at the 6th week under 30/20℃ alternating temperature, and reached 100% germination rate at the 8th week under 25℃ constant temperature. Seeds without any stratification treatment required 12 weeks to attain a 90% germination rate. Regardless of being fresh or subjected to 10-month low-temperature stratification, N. nagi seeds can maintain their high inherent germination vigor. Notably, after 10-month low-temperature stratification, the seeds can shorten germination time and achieve more uniform germination.