刻傷、低溫層積及延長光照對槲櫟橡實發芽及初期生長之促進

SCARIFICATION, COLD STRATIFICATION AND PROLONGED PHOTOPERIOD ACCELERATING ACORN GERMINATION AND INITIAL SEEDING GROWTH IN QUERCUS ALIENA BL. VAR. ALIENA

何雅齡(Ya Ling Ho) ； 廖宇賡(Yue Ken Liao)

《中華林學季刊》 49卷2期 (2016/06) Pp. 117-130

摘要

本研究利用刻傷(scarification)、浸泡過氧化氫(H2O2)或低溫層積(cold stratification)處理，尋求槲櫟(Quercus aliena Bl. var. aliena)橡實(acorn)較佳以及使其在最短時間內整齊發芽的方法。於2013年採集並低溫層積過的橡實，經刻傷及H_2O_2處理後，發芽率在94-97% 間，其平均發芽時間(mean germination time, MGT)比對照組可縮短1-2天，且不影響苗木後續的生長。2014年所採並經相同層積處理之橡實，經刻傷處理者將發芽率從27%提高到82%，亦顯著縮短平均發芽時間，且不影響苗木生長。若將低溫層積結合刻傷處理，則層積時間可從3個月縮短至2個月，其苗木育成之效果(發芽率乘以成苗率)相近。對提早進入生長期的小苗以延長光照處理以補足日照週期(每日合計有22 h)，追蹤9個月後，其苗高及地徑生長，都較同期接受自然光照週期的苗木有顯著的增加。本研究使用之方法有助於提供均質且生長快速的優質苗木供後續試驗或栽植利用。

關鍵字

低溫層積 ； 過氧化氫 ； 槲櫟 ； 刻傷

並列摘要

The study was conducted to investigate the effects of scarification, hydrogen peroxide (H_2O_2) stimulation and cold stratification on the improvement and acceleration of acorn germination in Quercus aliena Bl. var. aliena. Acorns collected in 2013, treated with cold stratification followed by scarification or H_2O_2 stimulation, achieved a germination percentage at 94-97% with their mean germination time (MGT) 1 to 2-day shorter than those in the control (stratification only). The subsequent seedling growth was not impacted due to these treatments. However, acorns from 2014 collection receiving the same stratification process performed a significant enhancement in germination after the scarification was applied accordingly, raising the germination percentage from 27 to 82% and again accelerating the MGT without repressing (damaging) the seedling growth. In a process combining the application of stratification and scarification, the duration of the former treatment could be reduced from 3 to 2 months as seedling preparation efficiency (germination rate × seedling establishment percentage) was similarly obtained. When prolonged photoperiod (22 h/d) was supplied to the seedlings as their growth started in the early growing season, the 9-month growth performance demonstrated that plant height and root collar diameter were both significantly increased as compared to those synchronously receiving natural photoperiod. The procedures suggested in this report are beneficial to the preparation of homogeneous, fast-growing and high-quality seedlings for further use.

並列關鍵字

Cold stratification ； H_2O_2 ； Quercus aliena Bl. var. aliena ； Scarification