The Intraspecific and Interspecific Competition of the Endangered Plant Sinomanglietia glauca
The natural population of Sinomanglietia glauca in Yujing Mountain,Jiangxi Province,was studied using the Hegyi single-tree competition index model to quantitatively analyze the intraspecific and interspecific competition intensity of S.glauca.The results showed that the competition pressure on the S.glauca population mainly comes from interspecific com-petition(with a competition index of 1 321.96,accounting for 59.48％ of the total competition index),and most of the in-terspecific competition is attributed to Phyllos tachys pubescens(with a competition index of 946.15,representing 42.57％ of the total competition index).The intensity of both intraspecific and interspecific competition,as well as the total competi-tion intensity,decreases with increasing diameter at breast height(DBH).A DBH of approximately 14 cm serves as a signifi-cant turning point in the competition dynamics of S.glauca.During the phase when DBH is less than 14 cm,the competition pressure predominantly arises from interspecific competition.Thereafter,intraspecific and interspecific competition become equally intense.The relative growth rate of S.glauca individuals decreases with increasing competition intensity.In the fu-ture,it is suggested to artificially create more suitable habitats such as forest gaps and open forests within the community to increase the population of small-sized S.glauca individuals.Moreover,selective logging of the more competitive P.pu-bescens and evergreen non-endangered tree species should be conducted to alleviate the interspecific competition pressure on medium-and large-sized S.glauca individuals,thereby promoting the healthy development of the natural population.
Endangered mechanismBiodiversity conservationExtremely small populationsPhyllostachys pubescens extensionIntolerant tree species
万方数据
维普
