ヒキミ エンシュウリン テンネンセイ スギ リュウボク ザイセキヒョウ ノ サクセイ
Volume Table of Natural Regenerated "SUGI"(Cryptomeria japonica D. Don)in Hikimi College Forest
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(1) To complete the volume table of natural regenerated "SUGI" (Criptmeria japonica D. Don.) in the Hikimi College Forest 110 sample trees were measured.
Data of sample trees is shown in Table 1.
(2) We used the following equation ;
logV = logA＋blogD＋clogH
If we put,
2＋logV = Y,logA = a,logD = X_1,logH = X_2
then the expression will be transformed as follows ;
Y = a＋bX_1＋cX_2
At first, the normal equation was calculated with the data of all sampe trees, and next we eliminated the abnormal data which was rejected at the 1 per cent level of significace.
With 109 sample trees, above equation become as follows;
Y = 1.78838X_1 + 0.91711X_2 - 2.01690
and the test of regression coefficients b, c and the constant a was very significant at the 0.01 significant level of significance.
(3)The test of multiple and partial correlation coefficient were very significant at the 1 per cent level of significance.
(4)Ajustment coefficient of bias that arises from this logarithumic equation is 1.0032.
Volume table (Table 2 ) was being revised by this coefficient.
The error ratio of the estimate of volume of a tree by this equation is about 21 per cent, and the standard error of mean or sum is (21)/(√<n>) per cent.
(5) The result of the test on fitness of volume tables for Akita district and for Western Japan is as follows; These tables are not applicable to the sample at the 1 per cent significance level.
The Shimane Agricultural College