[1]张鹏,王新杰*,高志雄,等. 将乐地区马尾松最优冠幅模型研究[J].西北林学院学报,2015,30(04):94-98.[doi:doi:10.3969/j.issn.1001-7461.2015.04.16]
 ZHANG Peng,WANG Xin-jie*,GAO Zhi-xiong,et al. Optimal Crown Diameter Models for Pinus massoniana in Jiangle, Fujian Province[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2015,30(04):94-98.[doi:doi:10.3969/j.issn.1001-7461.2015.04.16]
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 将乐地区马尾松最优冠幅模型研究()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第30卷
期数:
2015年04期
页码:
94-98
栏目:
出版日期:
2015-07-31

文章信息/Info

Title:
 Optimal Crown Diameter Models for Pinus massoniana in Jiangle, Fujian Province
文章编号:
1001-7461(2015)04-0094-05
作者:
 张鹏王新杰*高志雄许昊武文昊王廷蓉刘乐
 (北京林业大学 省部共建森林培育与保护教育部重点实验室,北京 100083)
Author(s):
 ZHANG Peng WANG Xin-jie* GAO Zhi-xiong XU Hao WU Wen-hao WANG Ting-rong LIU Le
 (The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China)
关键词:
 将乐国有林场冠幅模型马尾松
Keywords:
 Jiangle State-owned Forest Farm crown diameter model Pinus massoniana
分类号:
S791.248
DOI:
doi:10.3969/j.issn.1001-7461.2015.04.16
文献标志码:
A
摘要:
 树冠是树木进行光合作用和呼吸作用的重要场所,冠幅作为树冠的重要因子,直接影响树木的生活力和生产力,同时也是反映树木的长期竞争水平的重要指标。该文使用福建省将乐国有林场980株马尾松调查数据,基于11种常用树冠直径模型,利用R软件的nls模块对马尾松冠幅与胸径关系进行拟合,选取精度最高的作为基础模型,通过对基础模型添加变量改进模型,并用调整后的决定系数adj-R2、偏差Bias、剩余均方根误差RMSE对模型精度进行检验。结果表明:模型11在添加了样地优势木平均高(Ht)、每公顷株数(M)和冠长(CL)林分变量之后,BiasRMSE减小,adj-R2明显增大,所以,CW=(a+a1×Ht)/1+exp[(b+b1×M)+(c+c1×CL)ln(D+1)]能更好地模拟当地马尾松的冠幅与胸径的关系。
Abstract:
 Crown is an important part for photosynthesis and respiration. As one of the key variables, crawn diameter directly affects the life force of a tree and its productivity. It is also an important index reflecting the long-term competitive level of a tree. In this study, 980 individual trees of Pinus massoniana growing in Jiangle State-owned Forest farm of Fujian Province were selected to extract related data. Based on 11 types commonly used tree diameter models, nls module of R software was used to fit the relationship between crown diameter and diameter at breast height (DBH). Models with the highest accuracy were used as the basic ones, which would be then improved by adding basic variables. The accuracy of the models was tested by adjusted decision coefficient (adj-R2), bias error (Bias), root mean square error (RMSE). The results demonstrated that after stand variables of advantage wood average height (Ht), the number of per hectare (M) and crown length (CL) were added to model 11, its Bias and RMSE decreased, adj-R2 obviously increased, so the model CW=(a+a1×Ht)/1+exp[(b+b1×M)+(c+c1×CL)ln(D+1)] could be used to predict the relationship between the crown and DBH of P. massoniana growing in Jiangle.

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备注/Memo

备注/Memo:
 收稿日期:2014-09-16修回日期:2014-12-30
基金项目:“十二五”农村领域国家科技计划(2012BAD22B0502);林业公益性行业科研专项(200904003)。
作者简介:张鹏,男,硕士研究生,研究方向:森林可持续经营。E-mail:pengzh0211@163.com
*通信作者:王新杰,男,副教授, 研究方向:森林资源调查、监测及林业3S 综合应用。E-mail:xinjiew@bjfu.edu.cn
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