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Estimation of Site Index by Species in Gyungi and Chungcheong Provinces Using a Digital Forest Site Map  

구교상 (임업연구원 임지보전과)
김인호 (산림청 임업정책과)
정진현 (임업연구원 임지보전과)
원형규 (임업연구원 임지보전과)
신만용 (국민대학교 산림자원학과)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.5, no.4, 2003 , pp. 247-254 More about this Journal
Abstract
This study was conducted to develop site index equations by main species grown in Gyunggi and Chungcheong provinces using environmental factors obtained from a digital forest site map. For this, 28 environmental factors were regressed on site index by species. Four to five environmental factors by species were selected as independent variables in the best site index equations (coefficients of determination greater than 0.91). For these site index equations, three evaluation statistics, mean difference, standard deviation of difference, and standard error of difference, were applied to the data set. Site index equations by species relationships developed in this study effectively estimate forest productivity in the study area. However, the site index equation of Larix leptolepis showed a larger than expected bias between the estimated and the measured site index. The reason is not clear in this situation, but might be because of the small sample set. It will be necessary, therefore, to conduct more studies to determine the exact reason. It is also expected that the site index equations with a few environmental factors as independent variables could provide valuable information about species well suited to given site conditions. Site index equations for other species should be developed to establish a rational policy about the selection of best species for site conditions.
Keywords
site index; environmental factors; digital forest site map; stepwise regression; evaluation statistics;
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