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[1]何中声,刘金福,郑世群,等.单一斜率变点分析格氏栲幼苗的竞争范围[J].应用与环境生物学报,2012,18(05):847-852.[doi:10.3724/SP.J.1145.2012.00847]
 HE Zhongsheng,LIU Jinfu,ZHENG Shiqun,et al.Competition Zone of Castanopsis kawakamii Seedlings by Single Slope Change Point Analysis[J].Chinese Journal of Applied & Environmental Biology,2012,18(05):847-852.[doi:10.3724/SP.J.1145.2012.00847]
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单一斜率变点分析格氏栲幼苗的竞争范围()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
18卷
期数:
2012年05期
页码:
847-852
栏目:
研究简报
出版日期:
2012-10-25

文章信息/Info

Title:
Competition Zone of Castanopsis kawakamii Seedlings by Single Slope Change Point Analysis
作者:
何中声刘金福郑世群徐道炜洪伟吴承祯吴则焰
(1福建农林大学林学院 福州 350002)
(2福建省高校生态与资源统计重点实验室 福州 350002)
(3福建农林大学生命科学学院 福州 350002)
Author(s):
HE Zhongsheng LIU Jinfu ZHENG Shiqun XU Daowei HONG Wei WU Chengzhen WU Zeyan
(1Forestry College, Fujian Agriculture and Forestry University, Fuzhou 350002, China)
(2Key Laboratory of Fujian Universities for Ecology and Resource Statistics, Fuzhou 350002, China)
(3College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China)
关键词:
格氏栲幼苗竞争竞争范围单一斜率变点林窗
Keywords:
Castanopsis kawakamii seedlings competition competition zone single slope change point forest gap
分类号:
S718.54
DOI:
10.3724/SP.J.1145.2012.00847
文献标志码:
A
摘要:
依据改进Hegyi单木竞争模型计算林窗和林下不同龄级格氏栲幼苗的竞争强度,采用指数平滑模型对幼苗竞争强度数据进行优化,对优化后数据应用单一斜率变点法确定格氏栲幼苗最佳竞争范围. 结果表明:1)在格氏栲天然林中,林窗和林下格氏栲幼苗平均竞争强度随着竞争距离增大而逐步降低,初期下降较快,下降到一定程度后明显变缓,存在变化幅度的转折点,即为幼苗的竞争范围. 2)林窗和林下格氏栲幼苗竞争强度的三次指数平滑值在最佳平滑系数α为0.8和0.7时其均方误差值分别为0.401 5和0.385 1,单一斜率变点分析得出林窗和林下格氏栲幼苗最佳竞争范围分别是距对象木1.70 m和1.90 m. 研究结果可为格氏栲幼苗竞争格局研究中确定幼苗竞争范围提供科学理论依据. 表3 参20
Abstract:
The competition among the Castanopsis kawakamii seedlings were calculated with improved competition model for individual tree of Hegyi, which were optimized by the exponential smoothing model. The optimum competition ranges were confirmed by single slope change point analysis. The results showed that: (1) The average competition intensity of the C. kawakamii seedlings decreased with increasing of the competition distance. The competition intensity decreased quickly at early stage and then slow down in a certain extent, and there existed a turning point in the change range called the seedlings competition zone in the C. kawakamii natural forest gap and understory. (2) The minimum mean square errors of the third index smooth values of the C. kawakamii seedlings competition intensity in the forest gap and understory were 0.401 5 and 0.385 1 when smoothing coefficient α=0.8 and α=0.7 respectively. By applying the method of single slope change point, the optimal sampling competition zone of the C. kawakamii seedlings competition intensity were 1.70 and 1.90 meters distance from the objective trees in forest gap and understory. The results help us to determine the competition zone for the C. kawakamii seedlings’ competition pattern. Tab 3, Ref 20

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备注/Memo

备注/Memo:
福建省自然科学基金重点项目(No. 2008J0008)、教育部博士点基金项目(No. 200803890011)和博士后基金项目(No. 20070410796) 资助
更新日期/Last Update: 2012-10-26