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首页> 外文期刊>Journal of Forest Planning >Variation in Form-factors for Stem Surface Area in Even-aged Pure Stands of Japanese Larch (Larix kaempferi)
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Variation in Form-factors for Stem Surface Area in Even-aged Pure Stands of Japanese Larch (Larix kaempferi)

机译：日本落叶松（Larix kaempferi）平均年龄纯林中茎表面积的形状因子变化

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摘要

Variation in the form-factors for stem surface area was studied in two even-aged pure stands of Japanese larch (Larix kaempferi). In the stands, all living trees were felled for stem analysis, and then the form-factors for stem surface area and stem volume at breast height and 0.7 and 0.5 in relative height, i.e., kappa_h, kappa_(0.7), kappa_(0.5), gamma_b, gamma_(0.7) and gamma_0.5, were calculated. The coefficients of variation (CV) of kappa_(0.7) andkappa_(0.5) ranged from 3.2 to 7.4% and from 3.9to 8.8%, respectively. On the other hand, CVof kappa_b ranged from 9.1 to 15.4%, indicating that the variation in kappa_h was comparatively larger than those in kappa_(0.7) and kappa_(0.5). The ratios of CV of form-factor for stem surface area to that for stem volume ranged from 0.3 to 0.6, indicating that the variation in the form-factors for stem surface area was smaller than that for stem volume. In conclusion, kappa_(0.7) and kappa_(0.5) would be effective form-factors in estimating the total stemsurface area of a stand with the angle count sampling precisely.
机译：在日本落叶松（Larix kaempferi）的两个均匀陈化的纯林中研究了茎表面积的形态因子变化。在林分中，砍伐所有活树以进行茎分析，然后在胸高和相对高度分别为0.7和0.5的茎表面积和茎体积的形状因子，即kappa_h，kappa_（0.7），kappa_（0.5）分别计算了γ_b，γ_（0.7）和γ_0.5。 kappa_（0.7）和kappa_（0.5）的变异系数（CV）分别为3.2％至7.4％和3.9％至8.8％。另一方面，kappa_b的CV为9.1％至15.4％，表明kappa_h的变化相对大于kappa_（0.7）和kappa_（0.5）的变化。茎表面积的形状因子与茎体积的CV之比在0.3到0.6之间，这表明茎表面积的形状因子的变化小于茎体积的CV。总而言之，在精确计算角度计数采样值的情况下，kappa_（0.7）和kappa_（0.5）将是有效估算立木总茎表面积的有效因素。

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