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No.12 (1965/10) >

Title :ビッターリッヒ法による本数および材積の推定(2)
Title alternative :Estimate of volume and number of stands by the Bitterlich method (2)
Authors :砂川, 季昭
平田, 永二
Authors alternative :Sunakawa, Sueaki
Hirata, Eiji
Issue Date :1-Oct-1965
Abstract :This research was done in order to study the estimate values that were calculated by using the hand-made simple rods. The results obtained by the research are as follows: 1) The estimate values by the Bitterlich method were calculated smaller than the plot sampling on the four areas. This reason is considered that the Standing trees were not counted accurately, that is, many standing trees were missed to count because of the local topography(especially of the inclination)and standing of the forest tree. Moreover, it is seemed to be necessary to take note in a case using a hand-made simple rod. 2)The simple rods, of which basal area factors are l,4 and l0, were used in the research. It is generally practiced that the simple rod with the smaller basal area factor is for young stands and the one with the larger basal area factor is for old stands. The research, however, led to the consideration that the use of the simple rod with the basal area factor 4was rather suitable to either young or old trees in Okinawa, whereas the use of the simple rod with the basal area factor l was undesirable in the moudtain forest. 3)The estimate values, obtained from both ration estimate and the method by breast height form factor, were very resemble. It was, therefore, considered to be feasible to apply the Table 28 of the present paper to the measurement of the stand volume. There are many such problems to solve as the diameter distribution of standing trees of the area, the variation of estimate values and the study of regression estimate. The authers expect to obtain some results by working on the problem.
Type Local :紀要論文
ISSN :0485-7828
Publisher :琉球大学農家政工学部
URI :http://hdl.handle.net/20.500.12000/23228
Citation :琉球大学農家政工学部学術報告 = The science bulletin of the Division of Agriculture, Home Economics & Engineering, University of the Ryukyus no.12 p.193 -220
Appears in Collections:No.12 (1965/10)

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