Global woodland structure from local interactions:new nearest-neighbour functions for understanding the ontogenesis of global forest structure  

作　　者：Arne Pommerening Hongxiang Wang Zhonghua Zhao 

机构地区：[1]Faculty of Forest Sciences,Department of Forest Ecology and Management,Swedish University of Agricultural Sciences SLU,Skogsmarksgränd 17,SE-90183 Umeå,Sweden [2]College of Forestry,Guangxi University,Nanning 530004,China [3]Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration,Research Institute of Forestry,Chinese Academy of Forestry,Box 1958,Beijing 100091,China.

出　　处：《Forest Ecosystems》2020年第2期290-300,共11页森林生态系统（英文版）

基　　金：partly supported by the Guangxi Innovation Driven Development Project(No.AA17204087-8);funded by the National Natural Science Foundation of China(project No.31670640)。

摘　　要：Background:A number of hypotheses and theories,such as the Janzen-Connell hypothesis,have been proposed to explain the natural maintenance of biodiversity in tropical and temperate forest ecosystems.However,to date the details of the processes behind this natural maintenance are still unclear.Recently two new nearest-neighbour characteristics were proposed and in this paper we demonstrate how they can contribute to a better understanding of the ontogenesis of global forest structure from localised neighbourhoods.Methods:We applied the new species and size segregation functions together with appropriate test procedures to four example woodland data sets from China at Daqingshan,Jiaohe,Jiulongshan and Xiaolongshan forest regions.In addition we quantified the morphology of the new characteristics and modelled a neighbourhood allometric coefficient linking the two functions.Results:The results revealed quite different species segregation patterns with both conspecific and heterospecific attraction.We found these to be generally matched by equivalent size segregation patterns of attraction of similar and different sizes.It was straightforward to model the size segregation function from the knowledge of the species segregation function by estimating a neighbourhood allometric coefficient.Conclusions:The new characteristics have helped to quantify the extent and rate of decline of neighbourhood interactions in terms of spatial species and size diversity.Through the allometric neighbourhood coefficient the analysis highlighted once more how closely related species and size segregation are,thus supporting the minglingsize hypothesis.Using both a traditional and a restricted random-labelling test has provided a valuable tool for understanding the exact nature of species-mingling and size-inequality relationships.

关 键 词：Species segregation function Size segregation function Mingling-size hypothesis Neighbourhood allometric coefficient random labelling 

分 类 号：S718.5[农业科学—林学]