| 固定角规点上估测林分生长的期初特征值法 |
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| 引用本文： | 徐祯祥,孔维鹤,刘建生,李海奎.固定角规点上估测林分生长的期初特征值法[J].河南林业科技,1997,17(3):16-20. |
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| 作者姓名： | 徐祯祥 孔维鹤 刘建生 李海奎 |
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| 作者单位： | 河南省林业科学研究所(徐祯祥)，河南省林业厅(孔维鹤)，河南省林业勘察设计院(刘建生)，河南农业大学(李海奎) |
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| 摘 要： | 复测固定角规点时，令保留木和进界木的期初断面积分别为ｇ１和ｇ０，它们的期末断面积为ｇ２，若把断面积比（ｇ１／ｇ２）和（ｇ０／ｇ２）分别称为保留木和进界木期初断面积特征值δ１和δ０，而它们的期末特征值仍为δ＝１，则林分每公顷断面积生长量△Ｇ＝Ｆ（∑Ｚ２ｉ＝１δｉ－∑Ｚ１ｊ＝１δ１ｊ－∑Ｚ２－Ｚ１ｋ＝１δｏｋ）。当保留木和进界木的期初形高分别为ｈｆ１和ｈｆ０，它们的期末形高为ｈｆ２时，则林分每公顷的蓄积生长量△Ｍ＝Ｆ（∑Ｚ２ｉ＝１ｈｆ２ｉ－∑Ｚ１ｊ＝１（δ１ｈｆ１）ｊ－∑Ｚ２－Ｚ１ｋ＝１（δ０ｈｆ０）ｋ。期初特征值法的特点是，既能保持直接法的优点———与林分蓄积现状具有一致性，便于连续清查，又能避免其缺点———抽样效率低。能真实地反映林分生长的连续性、渐进性。模拟实验证明，期初特征值法的抽样精度为９５％左右，平均系统误差为±５％左右。抽样效率是直接法的１０—３０倍。
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| 关 键 词： | 进界木 期初特征值 |
The Method of Growth Characteristic Value To Estimate and Measure Stand Growth at Fixed Angle Point |
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| Xu Zhengxiang.The Method of Growth Characteristic Value To Estimate and Measure Stand Growth at Fixed Angle Point[J].Journal of Henan Forestry Science and Technology,1997,17(3):16-20. |
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| Authors: | Xu Zhengxiang |
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| Institution: | Xu Zhengxiang (Forestry Research Institute of Henan Province) Liu Jiansheng (Forestry Reconnaissance and Design Institute) Li Haikui (Henan Agriculture University) |
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| Abstract: | When remeasuring at fixed angle gauge point, Suppose the cross-section area at breast height of reserved trees and ingrowth trees are g 1 and g 0 respectively, their cross-section area at the end of the period is g 2,the ratios of cross-section, g 1/g 2 and g 0/g 2 are called growth characteristic value of reserved trees and ingrowth trees are δ 1 and δ 0,then stand cross-section area per hectare △G=F(∑Z 1j=1(1-δ 1) j+∑Z 2-Z 1k=1(1-δ 0) k). If the form height of reserved trees and ingrowth trees at the beginning of the period are h 1 and h 2 respectively, and the form height at the end of the period is h f2 ,Stand volume growth △M=F(∑Z 2I=1h f2i -∑Z 1j=1(δ 1h f1 ) j-∑Z 2-Z 1k=1(δ 0h fo ) k). The method of growth characteristic value not only keeps the advantage of direct method——easy for continuous inventory, but avoids its weakness—— inefficient sampling. It could really reflect continuity and gradual advancement of stand growth. The simulated experiment shows: sampling precision of method of growth characteristic value is about 95Percent,systematic error is about is+5Percent and the relative sampling effiiency was 10～30fold of that of the direct method. |
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| Keywords: | Iingrowth tree Growth characteristic value |
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