大别山区银缕梅的群落特征与竞争关系OA

[Objective]To explore the intraspecific and interspecific competition intensity of the rare and endangered plant Parrotia subaequalis community,understand its community characteristics,and provide a theoretical basis for the protection and wild return of P.subaequalis.[Method]Taking the population of P.subaequalis in the central of the Dabie Mountains as the research object,four stan-dard plots were set up.The site conditions,growth status and dominant tree species were analyzed.The Hegyi competition index was used to analyze the competition relationship of different diameter classes of P.subaequalis.[Result]The population of P.subaequalis in the middle of the Dabie Moun-tains has the highest dominance and is distributed in the understory associated with sun-loving or adapt-able tree species.The competition pressure among different diameter classes of P.subaequalis is pri-marnly from intraspecific competition,which is mainly concentrated in individuals with a breast diam-eter of 0～6 cm.As the breast diameter increases,the intraspecific competition index decreases.Slope,soil organic matter content,and intraspecific competition intensity are strongly correlated with the growth status of the P.subaequalis population and are the key limiting factors affecting its distribu-tion.[Conclusion]P.subaequalis have a certain preference for growth conditions and are primarily influenced by self-thinning caused by intraspecific competition.As succession progresses,intense interspecific competition will gradually replace the domina.It is suggested that regular monitoring of the existing area of the P.subaequalis should be carried out,and the forest structure should be adjusted in a timely manner to promote the population renewal of this species.