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題 名 | 疏伐與修枝對臺灣扁柏天然更新林生長效應之研究=Effects of Thinning and Pruning on the Growth of Naturally Regenerated Yellow Cypress (Chamaecyparis obtusa var. formosana) Stands |
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作 者 | 邱志明; 唐盛林; 彭炳勳; 蔣華蕾; | 書刊名 | 臺灣林業科學 |
卷 期 | 32:1 2017.03[民106.03] |
頁 次 | 頁31-42 |
分類號 | 377.13 |
關鍵詞 | 臺灣扁柏; 疏伐; 修枝; 生長; 林分結構; Chamaecyparis obtusa var; Formosana; Thinning; pruning; Growth; Stand structure; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究地區位於棲蘭山100線14.5 km附近扁柏天然更新林分,於1993年當林齡32年生時進行不同 程度疏伐與修枝處理,並於疏伐修枝後7、12、17和20年,調查量測胸徑與樹高生長。結果發現臺灣 扁柏天然更新林在疏伐後12年(林齡44年生)、17年(林齡49年生)及20年(林齡52年生)時,胸徑及樹高 淨生長有顯著差異,但斷面積及材積無顯著差異;修枝處理後7年,雖修枝1/2之樹高>2/3之樹高>未 修枝之趨勢,但修枝後20年(52年生),各項生長性狀如胸徑、樹高和材積仍無顯著差異。疏伐後20年 株數枯死率,中度疏伐株數為3.1%,弱度疏伐為6.3%,對照區未疏伐為9.6%。扁柏生長緩慢,疏伐 後20年,中度疏伐胸徑平均一年生長0.31 cm,弱度疏伐0.30 cm,而未疏伐之對照區僅生長0.26 cm; 材積生長,中度疏伐5.80 m3 ha-1 yr-1,弱度6.46 m3 ha-1 yr-1,對照區6.09 m3 ha-1 yr-1。本研究以Weibull 機率密度函數,分析扁柏天然林分不同疏伐處理及不同林齡林分直徑分布之配置,其結果理論值和實 測值差異,皆小於p = 0.01之K-S測驗值,顯示其配置良好,且其參數與林分構成因子具有明顯之相關 性,可解釋不同處理、不同林齡之各項生長性狀之林分動態狀況,以推測未來林分之構成狀況及碳吸 存變化。 |
英文摘要 | Naturally regenerated yellow cypress (Chamaecyparis obtusa var. formosana) stands were located at Chilan Mountain, northern Taiwan, on Hwy. 100 near the 14.5-km marker. Thinning and pruning treatments were carried out in 1993 when the stands were 32 yr old. This study reports the results of diameter at breast height (DBH) and tree height growth 7, 12, 17, and 20 yr after thinning and pruning. Data of DBH and net height growth of yellow cypress showed a significant increase 12 yr or longer periods after thinning compared to the no-thinning stand. However, the basal area and timber volume showed no difference among thinning treatments. Pruning treatment showed a trend of net height growth, i.e., pruning 1/2 of tree height > 2/3 of tree height > no pruning (control), but tree growth traits such as DBH, tree height, and volume showed no differences at 20 yr after pruning. Tree mortality percentages of yellow cypress with medium thinning, light thinning, and control treatments were 3.1, 6.3, and 9.6%, respectively, at 20 yr after thinning. Since yellow cypress trees grow very slowly, the average annual growth increments of DBH 20 yr after treatment for medium thinning, light thinning, and control treatments were 0.31, 0.30, and 0.26 cm, respectively, and of volume were 5.80, 6.46, and 6.09 m3 ha-1, respectively. We used the Weibull probability density function with thinning, pruning, and age as parameters to estimate the diameter distribution. Results showed the goodness of fit was p = 0.01 by the Kolmogorov-Smirnov test. Furthermore, the parameters and elements of stand structure had significant relationships. These results can explain the dynamics of stand growth based on the diameter distribution and can be used to estimate the structure of the stand and carbon sequestration in the future. |
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