相思樹及油桐樹更新潛勢之研究

Regenerative Potential of Acacia confusa and Aleurites montana

黃裕星(Yue-Hsing Huang) ； 游漢明(Han-Ming Yu) ； 周富三(Fu-Shan Chou)

《中華林學季刊》 46卷3期 (2013/09) Pp. 285-292

摘要

本研究的主要目的在評估相思樹及油桐樹的更新潛勢，調查19個成熟的且不受人為干擾的相思樹及油桐樹人工林。相思樹及油桐樹在各個林分中的徑級結構曲線都是呈鈴型分布，顯示林分中的相思樹與油桐樹族群是呈現逐漸減少萎縮的趨勢，雖然有些林分的林下出現許多的相思樹或油桐樹的幼苗，但這些幼苗大多數無法長成幼木，僅有在大孔隙中的幼苗才能長成幼木，顯示相思樹及油桐樹都是屬於陽性的樹種，其林下的更新潛勢相當小。

關鍵字

相思樹 ； 油桐樹 ； 更新潛勢

並列摘要

This study aimed to evaluate regenerative potential of Acacia confusa and Aleurites montana at understory. Ten artificial Acacia confusa and nine Aleurites montana stands were surveyed. All woody plants with diameter at breath high (DBH) ＞1 cm present in the quadrates were identified, and DBH were measured. The diameter structure curves of Acacia confusa and Aleurites montana population were all bell shaped in each stand. The results showed that the Acacia confusa and Aleurites montana population had a bad regeneration and revealed a regression phenomenon. Although there were many Acacia confusa and Aleurites montana seedlings appear on the understory, almost these seedlings could not grow to be saplings. We find that the Acacia confusa and Aleurites montana sapling appeared in forest edges and large gaps, the results showed the Acacia confusa and Aleurites montana belonged to pioneer species or shade intolerant species, and their regenerative potential were fairly low at understory.

並列關鍵字

Acacia confusa ； Aleurites montana ； regenerative potential