Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/65926
標題: 台中港區木麻黃天然更新可行性之研究
Study on regeneration possibility of Casuarina wind break forest in Taichung Harbor
作者: 林睿思
Lin, Jui-Szu
關鍵字: Casuarina equisetifolia
木賊葉木麻黃
windbreak forest
nature regeneration
seed rain
disturbance
seed bank
防風林
天然更新
種實雨
干擾
土壤種子庫
出版社: 森林學系所
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摘要: 台中港區自民國65年起造林至今,造林樹種多以木麻黃為主,雖然生長快速,但有壽命短且不易天然下種更新之缺點,為解決此更新問題,本試驗於台中港區防風林內,依大、中、小孔隙及對照組設置樣區,期由木麻黃林下的孔隙更新調查、干擾枯枝落葉層的處理與林分內種實雨、種子庫等調查,釐清木麻黃天然更新之所需之條件與機制。 試驗結果顯示種子庫與種實雨於孔隙間累積情形相似,皆以對照組為最大量,大孔隙為最少量,試驗期間種實雨落下之種子數量相當龐大(約250 seeds m-2 month-1),各孔隙處理之土壤種子庫含量極少(1-27 seeds m-2),乃因種子於林地內不易保存。干擾處理後,試驗地未發現大量木麻黃天然更新小苗,於干擾地上直播後灌溉即可產生大量更新苗,灌溉後種子發芽率於小孔隙及對照組處理中,可達到15% 以上。試驗期間於港區帶狀更新地上發現天然更新之木麻黃小苗,更新地之林緣處有密度5 株m-2以上之天然更新小苗,小苗根系及生長狀況良好,可成為天然更新之來源。 綜合以上結果顯示木麻黃天然更新之主要來源為種實雨,在衰老之海岸木麻黃林分中,除枯落物累積及雜草覆蓋為木麻黃天然更新之限制因子外,水分缺乏亦為台中港區木麻黃天然更新之主要限制因子。若能去除這些因子,木麻黃天然更新是可被期待的。
Since 1976, Casuarina spp. were the major windbreak species used to afforest in Taichung Harbor. They grew fast, but had short life and hardly natural regeneration. In order to dispose of this problem, we set plots in large, medium, small gap and under close stand (control). To understand the requirement and the mechanism of the regeneration of Casuarina spp. the gap regeneration, the treatment on the litter layer, the seed rain and the seed bank were surveyed in this study. The result showed that the accumulation of the seed rain and of the seed bank were similar. The highest values were in the control plots and the smallest values in large-gap plots. The number of seeds were a lot in seed rain (about 250 seeds m-2 month-1), but less in seed bank (1-27 seeds m-2 ). It resulted from the uneasy storage. There were a few seedlings has be found in the plot after disturbance. After seeding and irrigating, a lot of regeneration seedling occurred. The germination rate in the small gap and the control plots can reach about 15% after irrigation. There were a lot of natural regeneration seedlings at strip regeneration site (above 5 seedlings m-2). These seedlings were robust and might be the source of nature regeneration. In conclusion, the main source of seedlings was seed rain. In the declining Casuarina spp. stands, the main limit factors of nature regeneration were not only the litterfall and weeds, but also the deficiency of water. The natural regeneration of Casuarina spp. could be expected, as if these factors removed.
URI: http://hdl.handle.net/11455/65926
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2808200709442400
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