查詢結果分析
來源資料
相關文獻
- Distance-Dependent Competition Measures for Individual Tree Growth on a Taiwania Plantation in the Liuguei Area
- 林木位置圖之製作與應用
- 勞動力市場的自然觀察與CIER指數研究
- 地面光達應用於林木競爭之研究
- 紅檜人工林疏伐後4年對林分及單木層級之影響
- 以競爭指數配合搜尋半徑預測單木胸徑及胸高斷面積生長之研究--以紅檜人工林為例
- 不等林木間距對平地造林地闊葉林立木生長之影響
- 應用Hegyi競爭指數規劃針闊葉混淆林林相改良之研究
- 低密度林分杉木樹冠特性之研究
- 臺灣花卉拍賣的價值模式規格檢定
頁籤選單縮合
題 名 | Distance-Dependent Competition Measures for Individual Tree Growth on a Taiwania Plantation in the Liuguei Area=距離相依競爭指數應用在六龜地區臺灣杉單木生長之研究 |
---|---|
作 者 | 汪大雄; 湯適謙; 謝漢欽; 鍾智昕; 林謙佑; | 書刊名 | 臺灣林業科學 |
卷 期 | 27:3 2012.09[民101.09] |
頁 次 | 頁215-227 |
分類號 | 436.11 |
關鍵詞 | 競爭指數; 林木單木生長; 距離相依生長模式; Competition index; Individual tree growth; Distance-dependent tree model; |
語 文 | 英文(English) |
中文摘要 | 人工林林分生長樹冠鬱閉後,為爭取林木生長所需之各項資源時,林木彼此間開始競爭有限之環境資源。林木間之競爭作用視主林木大小,競爭木數量、大小和主林木與競爭木間之距離會承受不同之競爭壓力。本研究使用距離相依之競爭指數來衡量各株單木承受之競爭壓力。使用Bella, Staebler,Hegyi, Martin-Ek, Alemdag和樹冠體積比六種競爭指數公式,並配合競爭木三種不同半徑之搜尋方式,計算台灣杉林分內各林木之競爭指數,以表示各林木在生長過程中遭遇競爭壓力之程度。此外,使用台灣杉林木5年胸徑、斷面積和材積之生長資料配置林木單株生長式,評估在單株生長式中納入競爭指數之效果,以瞭解競爭指標對林木生長之貢獻。研究結果顯示5年單木生長量和各競爭指數除了Martin-Ek外,皆呈現極顯著之相關(p < 0.0001)。初步資料分析結果顯示在台灣杉單木生長配置中納入競爭指數會減少模式配置之MSE,而增加模式之配置效果。單株生長式中納入競爭指數之效果在不同之林木屬性間有所差異。個案研究顯示納入競爭指數株後之單株生長式會比原有之生長式對林木定期生長之預測能力提昇14~17%。 |
英文摘要 | Competition among trees within a stand occurs when resource availability is insufficient to meet the total requirements of a tree population for optimal growth. Six distance-dependent competition measures that incorporate tree sizes and distances from neighbors, evaluated over varying competition zones, were used to assess the competition stress among trees. A reduction in the mean square error relative to the no-competition index involved was used to judge the performance of each competition index for 3 growth components (i.e., diameter at breast height (DBH), basal area, and volume). The results showed that except for Martin-Ek, the other competition indices investigated were significantly correlated with periodic growth in the 3 growth components (p < 0.0001). The performance of the competition indices in predicting 5-yr growth indicated that the inclusion of competition indices in the growth-prediction model reduced the mean square error from 14% for volume growth to 17% for DBH growth. Moreover, expanding the search zones in the Hegyi competition index was found to have slightly improved the ability to estimate competition effects. |
本系統中英文摘要資訊取自各篇刊載內容。