Assessing the influence of the minimum measured diameter on forest spatial patterns and nearest neighborhood relationships

作     者：LI Yuan-fa YANG Hai-peng WANG Hong-xiang YE Shao-ming LIU Wen-zhen 

作者机构：Guangxi Key Laboratory of Forest Ecology and ConservationCollege of ForestryGuangxi UniversityNanning 530004China Xiaolongshan Research Institute of Forestry of Gansu ProvinceGansu Provincial Key Laboratory of Secondary Forest CultivationTianshui 530004China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2019年第16卷第10期

页      面：2308-2319页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0907[农学-林学] 09[农学] 0303[法学-社会学] 090704[农学-森林经理学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0705[理学-地理学] 0815[工学-水利工程] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0704[理学-天文学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：financially supported by the National Science Foundation of China (grant no. 31400542 31460196) Guangxi Natural Science Foundation (grant 2016GXNSFBA380233) Guangxi special fund project for innovation-driven development (AA 17204087-8) 

主　　题：Distribution patterns Minimum measured diameter Mixed forest Nearest neighbor analysis Species mingling Uniform angle index 

摘      要：Forest structure analysis is important for understanding the properties and development of a forest community,and its outcomes can be influenced by how trees are measured in sampled *** there is a general consensus on the height at which tree diameter should be measured[1.3 m:diameter at breast height(DBH)],the minimum measureddiameter(MMD)often varies in different *** this study,we assumed that the outcomes of forest structure analysis can be influenced by MMD and,to this end,we applied g(r)function and stand spatial structural parameters(SSSPs)to investigate how different MMDs affect forest spatial structure analysis in two pine-oak mixed forests(30 and 57 years old)in southwest China and one old-growth oak forest(120years old)from northwest *** results showed that 1)MMD was closely related to the distribution patterns of forest *** distribution patterns at each observational scale(r=0-20 m)tended tobecome random as the MMD *** older the community,the earlier this random distribution pattern appeared.2)As the MMD increased,neighboring trees became more regularly distributed around a reference *** most cases,however,nearest neighbors of a reference tree were randomly distributed.3)Tree species mingling decreased with increasing diameter,but it decreased slowly in older forests.4)No correlations can be found between individual tree size differentiation and *** recommend that comparisons of spatial structures between communities would be more effective if using a unified MMD criterion.