Monitoring Survival Rates of Young Plantation Trees in Mountainous Regions in Japan using LANDSAT TM Data

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概要

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• It has proved difficult to monitor the state of plantations by field observations due to the high costs involved, although the extent of unsuccessful plantations has been increasing. The objective of this study was to develop a method to estimate the survival rates of planted trees in young Sugi (Cryptomeria japonica) and Hinoki (Chamaecyparis obtusa) plantations by analyzing LANDSAT TM (Thematic Mapper) data. Our hypothesis was that the survival rate of planted trees, which was regarded as closely correlated with canopy coverage of planted trees, could be represented by the digital number of bands or intensity of some index of remote sensing data. The study sites were young plantations (4 to 12 years old) in Kyushu University Forests in Miyazaki which is located in southern Kyushu, Japan (32°22′10″N, 131°10′40″E), within the cool-temperate deciduous zone. Plantations were divided into aspect classes as the minimum units of this study. The method had two main parts. 1) Interpreting survival rates of planted trees on a pair of aerial photographs. 2) Analyzing the relationships between TM data and the survival rates of trees under two models, MODEL I using NDVI (Normalized Difference Vegetation Index) and MODEL II using the TM band 3 digital number (DN) for detecting the difference in spectra between planted trees and grass. The results showed that: 1) there were big differences in the survival rates according to aspect, and northern slopes had relatively high survival rates compared with southern slopes. 2) It was difficult to estimate the survival rates of planted trees by NDVI. 3) The relationship between survival rates and DN in TM band 3 showed strong negative correlation with a coefficient of determination of 0.643. Thus, DN in TM band 3 appears to be preferable for estimating the survival rates of planted trees. This study thus indicated that TM band 3 approach would be the most effective monitoring method for plantations in inaccessible mountainous regions.

• 森林計画学会の論文

著者

• Imada Morio

  Faculty Of Agriculture Kyushu University

• Imada Morio

  Department Of Forestry Faculty Of Agriculture Kyushu University

• Iida Shigeru

  Research Institute of University Forests, Faculty of Agriculture, Kyushu University

• Mizoue Nobuya

  Kyushu Univ. Fukuoka Jpn

• Mizoue N

  Kyushu Univ. Fukuoka Jpn

• Mizoue Nobuya

  Department Of Forest And Forest Products Sciences Kyushu University

• Mizoue Nobuya

  Laboratory Of Forest Planning Kyushu University

• Mizoue Nobuya

  Department Of Forest And Forest Products Sciences Faculty Of Agriculture Kyushu University

• Teraoka Yukio

  The University Forest In Miyazaki Faculty Of Agriculture Kyushu University:(present)department Of Fo

• Inoue Susumu

  Research Institute For Applied Mechanics Kyushu University

• Yoshida Shigejiro

  Department Of Forest And Forest Products Sciences Kyushu University

• Yoshida Shigejiro

  Faculty Of Agriculture Kyushu University

• Mizoue Nobuya

  Faculty Of Agriculture Kyushu University

• Teraoka Yukio

  Faculty of Agriculture, Kagoshima University

• Hirata Akihisa

  Graduate school of Agriculture, Kagoshima University

• Teraoka Yukio

  Faculty Of Agriculture Kagoshima University

• Hirata Akihisa

  Graduate School Of Agriculture Kagoshima University

• Iida Shigeru

  Research Institute Of Kyushu University Forests

• Inoue Susumu

  Research Institute Of Kyushu University Forests

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