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題 名 | Three-year Patch Thinning Effects on the Stand Structure in Overstory Trees of a Japanese Cedar Plantation in Taiwan=塊狀疏伐對柳杉上層林木林分結構三年之影響 |
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作 者 | 汪大雄; 鍾智昕; 謝漢欽; 湯適謙; 陳財輝; | 書刊名 | 臺灣林業科學 |
卷 期 | 30:1 2015.03[民104.03] |
頁 次 | 頁55-74 |
分類號 | 436.41 |
關鍵詞 | 垂直均勻; 組對空間相關函數; 林分結構複雜度; 胸徑分化指標; Vertical evenness; Pair correlation function; Stand structural complexity; Weibull function; Diameter differentiation index; |
語 文 | 英文(English) |
中文摘要 | 林分結構在森林生態系經營中承擔重要之角色。本研究探討人倫地區35年生柳杉人工林在塊狀疏伐後三年內對上層林木林分結構之影響。試驗地內設置12個1公頃樣區,進行上層林木之每木調查和樣木位置之量測。以逢機區集方式逢機進行三種疏伐強度(疏伐面積25、50%和對照)之塊狀疏伐,每一處理重複4次。使用垂直均勻、胸徑分佈、組對空間相關函數(G函數)、胸徑分化指標和結構複雜度指標來推估疏伐後立即和前三年對林分上層木結構之影響。結果顯示上層林木之垂直均勻度在疏伐後降低;和下層疏伐不同,塊狀疏伐在疏伐後不會造成胸徑分佈之明顯左截;尺度變化導致林木空間點分佈,因疏伐強度之不同有所差異;林分結構複雜度隨者空間尺度和林分屬性有所變異,塊狀疏伐在疏伐後立即降低林分結構複雜度,但對胸徑和樹高則有不同之影響。 |
英文摘要 | Stand structure plays an important role in forest ecosystem management. In this study, we examined the immediate and 3-yr effects of patch thinning treatments on the stand structure of overstory trees in a 35-yr-old Japanese cedar (Cryptomeria japonica) plantation located in the Zenlen area, central Taiwan. Among twelve 1-ha plots, 4 plots were randomly assigned to 1 of 3 patch thinning intensities in a randomized complete block design: no removal (control), and 25 and 50% tree removal in the area. The stand structure of the residual overstory trees was examined immediately after thinning and again after 3 yr using non-spatial stand structural indices (vertical evenness and the diameter at breast height (DBH) distribution), a pair correlation function (G function), and spatial stand structural indices (diameter differentiation index and structural complexity index). The vertical evenness of the overstory tree canopy was reduced after thinning. Unlike the left-truncated Weibull DBH distribution commonly caused by thinning from below, no notable left-truncated Weibull distribution caused by patch thinning was detected. The change in the spatial point pattern expressed by the G function with scale-up at a distance scale was influenced by the intensity of the thinning. The stand structural complexity was affected by the spatial scale used and stand attributes surveyed, and it was reduced immediately after thinning but had varying impacts on the DBH and tree height. |
本系統中英文摘要資訊取自各篇刊載內容。