New indices to balanceα-diversity against tree size inequality  

作　　者：Li Zhang Brady K.Quinn Cang Hui Meng Lian Johan Gielis Jie Gao Peijian Shi 

机构地区：[1]College of Ecology and Environment,Bamboo Research Institute,Nanjing Forestry University,159 Longpan Road,Nanjing 210037,People’s Republic of China [2]Fisheries and Oceans Canada,Andrews Biological Station,125 Marine Science Drive,St.Andrews,NB E5B 0E4,Canada [3]Department of Mathematical Sciences,Centre for Invasion Biology,Stellenbosch University,Matieland 7602,South Africa [4]Mathematical and Physical Biosciences,African Institute for Mathematical Sciences,Cape Town 7945,South Africa [5]Department of Biosciences Engineering,University of Antwerp,B-2020 Antwerp,Belgium [6]College of Life Science,Xinjiang Normal University,102 Xinyi Road,Urumqi 830054,People’s Republic of China

出　　处：《Journal of Forestry Research》2024年第1期229-237,共9页林业研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(32101260).

摘　　要：The number and composition of species in a community can be quantified withα-diversity indices,including species richness(R),Simpson’s index(D),and the Shannon-Wiener index(H΄).In forest communities,there are large variations in tree size among species and individu-als of the same species,which result in differences in eco-logical processes and ecosystem functions.However,tree size inequality(TSI)has been largely neglected in studies using the available diversity indices.The TSI in the diameter at breast height(DBH)data for each of 99920 m×20 m forest census quadrats was quantified using the Gini index(GI),a measure of the inequality of size distribution.The generalized performance equation was used to describe the rotated and right-shifted Lorenz curve of the cumulative proportion of DBH and the cumulative proportion of number of trees per quadrat.We also examined the relationships ofα-diversity indices with the GI using correlation tests.The generalized performance equation effectively described the rotated and right-shifted Lorenz curve of DBH distributions,with most root-mean-square errors(990 out of 999 quadrats)being<0.0030.There were significant positive correlations between each of threeα-diversity indices(i.e.,R,D,and H’)and the GI.Nevertheless,the total abundance of trees in each quadrat did not significantly influence the GI.This means that the TSI increased with increasing spe-cies diversity.Thus,two new indices are proposed that can balanceα-diversity against the extent of TSI in the com-munity:(1−GI)×D,and(1−GI)×H’.These new indices were significantly correlated with the original D and H΄,and did not increase the extent of variation within each group of indices.This study presents a useful tool for quantifying both species diversity and the variation in tree sizes in forest communities,especially in the face of cumulative species loss under global climate change.

关 键 词：Diameter at breast height(DBH) Gini index Shannon-Wiener index Simpson’s index QUADRAT Tree size 

分 类 号：S718.5[农业科学—林学]