文献类型：期刊文献

中文题名：辽东山区人工红松冠长率影响因子研究

英文题名：Influencing Factors on the Crown Ratio of Korean Pine Plantation in Eastern Liaoning Province

作者：刘奇峰[1] 陈东升[2] 冯健[3] 高慧淋[1]

第一作者：刘奇峰

机构：[1]沈阳农业大学林学院,辽宁沈阳110866;[2]中国林业科学研究院林业研究所,北京100091;[3]辽宁省林业科学研究院,辽宁沈阳110032

年份：2022

卷号：35

期号：6

起止页码：127-134

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：辽宁省教育厅一般项目(LSNQN201901);沈阳农业大学博士启动基金(880418014)资助。

语种：中文

中文关键词：红松;坡向;竞争水平;再参数化;冠长率

外文关键词：Pinus koraiensis;slope aspect;competition;re-parameterization;crown ratio

分类号：S718.42

摘要：[目的]建立包含林木竞争、地形(坡度、坡向、坡位)的不同林层的辽东山区人工红松冠长率模型,研究不同竞争水平及地形对冠长率的影响,比较林层间的冠长率差异,为辽东山区红松人工林经营奠定基础。[方法]以辽宁省清原县大边沟林场红松人工林为研究对象,基于冠长率基础模型,通过再参数化方法引入竞争因子,采用哑变量方法进一步引入地形因子,选取对模型贡献最大的地形因子,最终建立包含竞争、地形变量的不同林层间的人工红松冠长率哑变量模型,模拟了各因子对人工红松冠长率的影响。[结果]与基础模型相比,引入林木竞争、地形因子坡向的不同林层冠长率模型R^(2)_(a)提升了0.113,RMSE降低了0.012,竞争、坡向、林层对冠长率模型的贡献率(MSER)分别为14.14%、2.25%、0.16%。冠长率随林木胸径的增大而减小,随林木竞争水平的增大而增大。随林木竞争水平的增大,冠长率随树高变化规律由负增长逐渐转为正增长。经F检验,不同坡向、林层之间冠长率差异显著,变化规律为阴坡>半阳坡>阳坡,在林层间表现为上林层>下林层。[结论]地形与林木竞争因子显著影响人工红松冠长率,坡向是对人工红松冠长率影响最大的地形因子。本研究构建的包含地形与林木竞争的冠长率模型精度较高,为辽东山区红松人工林经营管理及生长量预估提供参考。
[Objective]To study the effects of different competition levels and topography on the canopy length and compare the forest layers,the crown ratio model considering competition and topographic(slope,slope aspect and slope position)variables of Pinus koraiensis plantation in eastern area of Liaoning province was developed.[Method]The crown ratio model was developed by incorporating competition index and topographic variable using re-parameterization and dummy variable methods.and the specific topographic variable expressing the largest contribution was selected.The effect of competition and topographic variable on the crown ratio was simulated.[Result]Compared with the basic model,the R^(2)_(a) for the finial model incorporating competition,topographic variable and forest layer increased by 0.113,RMSE decreased by 0.012.The contributions of competition,slope aspect and forest layer to the crown ratio model were 14.14%、2.25%、0.16%,respectively.The crown ratio decreased with the increase of D and increased with the increase of forest competition.With the increase of the competition,the crown ratio turned from negative growth to positive growth with tree height increasing gradually.The F test showed that there were significant differences in crown ratio between different slope aspects and forest layers,and the change rule was shady slope>semi-sunny slope>sunny slope and upper forest layer>lower forest layer.[Conclusion]Topography and forest competition factors significantly affect the crown ratio,and slope aspect is the most important topographic factor affecting the crown ratio of individual tree of Pinus koraiensis plantation.The crown ratio model based on topography and forest competition has high accuracy and provides a reference for the management and growth prediction of Pinus koraiensis plantation in eastern area of Liaoning Province.