- 期刊
疏伐對柳杉林分生長結構及冠層下植物之影響
Effects of Thinning on Growth and Structure of Overstory and Understory Woody Plants of a Japanese Fir Plantation in Northern Taiwan
摘要
在臺灣，日本柳杉經營之目標爲木材生產，惟由本樹種所建造的同齡純林其結構通常缺乏變化。本研究探討疏伐對柳杉人工林分之生長、結構及下層植群重建的效應，研究對象爲位於竹東事業區的28年生林分，採用4種不同強度的疏伐，即強度（留存515±75株／ha）、中度（留存660±36株／ha）、弱度（留存1,000±36株／ha），及未疏伐之對照組（留存1,560±335株／ha）。疏伐後8年，主要的結果爲：①疏伐促進冠層林木的高度及直徑生長，尤以對優勢木的效果最佳；②在強度及中度疏伐區優勢木年輪的年生長表現仍然呈現增加之反應；③冠層開闊度在8年期間縮小量在強度疏伐區最爲明顯，約爲8%；④在強度疏伐區因各徑級林木在疏伐後之生長量不同，冠層林木依直徑大小的株數頻度分布樣式逐漸趨向常態分布；⑤強度疏伐可重建活性及複雜的下層植群。
並列摘要
The management objective of Japanese fir was for timber production in Taiwan. Most of the monoculture stands composited of the species frequently lack structure diversity. We examined lowing thinning effects on growth and structure of the overstory and understory vegetation 8 years after treatment. A 28-year-old plantation in northern Taiwan were thinned with 4 intensities respectively: heavily (515±75 tree/ha), moderately (660±36 tree/ha), lightly (995±41 tree/ha), and unthinned (1,463±312 tree/ha). After 8 years, major results from this study are① thinning enhanced the height and diameter growth of residual overstory, especially of dominant trees;② the annual increment of stem diameter of residual dominant trees during the period after thinning was enhanced continuously in heavily and moderately thinned stands;③ the openness of overstory canopy was decreased by approximately 8% in stand with heavy thinning treatment which was more significant than other 3 treatments;④ due to the difference of growth rate among tree sizes, the clumped pattern of frequency structure of tree sizes in heavily thinned stand was shifted toward normal distribution;⑤ stands with heavy thinning offer the opportunity to restore vigorous and complex understory vegetation.
被引用紀錄
延伸閱讀
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