An error of measured height by using a measurement stick in evergreen broad leaved forest (Forestry Experiment Station)
| Autor: | Hirata, Eiji, Terazono, Ryuichi, Asato, Isao |
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| Jazyk: | japonština |
| Rok vydání: | 1992 |
| Zdroj: | 琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus. 39:177-182 |
| ISSN: | 0370-4246 |
| Popis: | 本報は,天然林で測竿を用いて樹高を測定した場合の測定誤差について,1,175本の資料を用いて検討したものである。その結果を要約すると次の通りである。1)測竿で測定された樹高は実際の樹高に比べてやや過小の値を与える。2)測竿樹高と実樹高の関係は,プロットや樹種の違いによって異なった傾向を示す。3)測定誤差は樹高が高くなるにしたがって増大する傾向にあるが,誤差率は樹高とはさほど関係なく,ほぼ一定の値(平均4.2%)を示す。4)測竿樹高を用いて求めた材積は,実樹高のそれとは殆ど差がなく,測竿樹高の材積に及ぼす影響は小さいといえる。 The measurement error of the tree height determined with a measurement stick in evergreen broad leaved forest was studied with 1,175 samples. The results obtained were as follows; 1) The measured height by using a stick was slightly smaller than the actual height. 2) The relationship between the measured height by using a stick and the actual height gave different tendencies in plots and species. 3) Measurement error tended to increase as the tree height increased while the error rate was not influenced by the tree height and showed almost constant value (average value of 4.2%). 4) The stem volume determined from the measured height by using a stick gave almost no difference with that determined from the actual height, indicating a small influence of the measured heigth by using a stick on the stem volume. 紀要論文 |
| Databáze: | OpenAIRE |
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