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題 名 | 塔塔加高山生態系土壤溫度資料之檢定、校正與補遺=The Examination, Adjustment and Supplement of Soil Temperature Data in Tatachia Area |
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作 者 | 陳信雄; 魏聰輝; | 書刊名 | 國立臺灣大學農學院實驗林研究報告 |
卷 期 | 15:2=232 2001.06[民90.06] |
頁 次 | 頁63-75 |
分類號 | 436.193 |
關鍵詞 | 資料檢定; 土壤溫度; 塔塔加高山生態系; 長期生態研究; Data examination; Soil temperature; Tatachia altitudinal ecosystem; Long tern ecosystem research; |
語 文 | 中文(Chinese) |
中文摘要 | 經營計劃時,對於立木材積資料之獲取,皆必須使用立木材積表,而當材積表之編製距現時太久;或無某樹種材積表,又不能伐倒立測其材積時,有必要發展測計立木材積之新方法。1947年奧國森林學家Bitterlich發表使用角度計數調查法後,陸續發展出多種測計儀器,Tele-relaskop除能以無邊樣區取樣法選取樣木外,並具有測計胸高斷面積、樹高及樹幹任意位置之直徑與高?的相對值,利用所測計之資料,進而由幾種求積法得到立木之材積。本論文將不等機率取樣理論為基礎,採用無邊樣區取樣法中之水平樣點取樣法,使用Tele-relaskop選取樣木及測定林木,而能在沒有材積表的狀況下,推算材積。 本研究主要使用雙重取樣法,第一重取樣由無邊樣區取樣法,使用ele-relaskop選取樣木推算林分斷面積,再以比率估計之Midzuno氏不等機率計法抽取第二重樣區,採用Tele-relaskop測計第二重樣區之林木推算樹徑及樹高,進行幾種求積法之比較,結果發現由任意直徑之最小資料求積法(四點法)推算材積,進而推算每公頃林分平均材積與株數之結果最佳。使得森林調查從取樣、測計到材積推論,都能達到精簡且精密的目的。 |
英文摘要 | The stem volume of a tree is the most important either in it's wood product or in it's value, therefore the volume estimated is the major subject of forest mensuration. In the forest survey or preparing the forest management plan, the data of tree volume must get from volume table. When the tree volume table was constructed for a long time or shortage, and not able to cut standing tree to measure it's volume, it is necessary to develop a new method to measure standing volume. After Bitterlich, an forester of Austrian, developed the angle gauge sampling in 1974, several mesured instrument are created continually. Tele-relaskop can be used to choice sample tree by plotless sampling, and it can measure the basal area at breast height, the tree height and the relative value of diameter and height at any point. Using the measured data we can get the volume by several estimated methods. This study will use unequal probability sampling as a basis, adopt the horizontal point sampling of plotless sampling, and final use Tele-relaskop to choice sample trees. Then we can estimate volume without volume table. In this study, double sampling is a major method. It uses plotless sampling at first-phase sample, estimator with Midzuno's design of unequal probability sampling to get the data of second-phase sample. Then, using Tele-relaskop to measure trees in second-phase sample and estimate the diameters and the tree hights. Proceeding to the last step, we will compare several methods of estimating volume. The results showed that when we use any visible diameters methods for minimum data(four points) to estimate volume and to estimate stand average volume and number of tree per acre, we can get the best outcome. So, the study can reach the objectives of simplicity and precision, no matter with sampling, measuring or estimating volume. |
本系統中英文摘要資訊取自各篇刊載內容。