摘要
以江西省玉京山华木莲(Sinomanglietia glauca)天然种群为研究对象,利用Hegyi单木竞争指数模型对华木莲的种内及种间竞争强度进行定量分析。结果表明:华木莲种群受到的竞争压力主要来自于种间(竞争指数为1321.96,占总竞争指数的59.48%),且种间竞争绝大部分来自毛竹(Phyllostachys pubescens,竞争指数为946.15,占总竞争指数的42.57%)。华木莲的种内、种间、总竞争强度均随胸径的增大而减小。胸径为14 cm左右时是华木莲竞争格局变化的重要拐点,在胸径小于14 cm阶段,华木莲所受竞争压力以种间竞争为主,之后则受到强度相当的种内及种间竞争。华木莲个体的相对生长速率随其承受竞争强度的增加而降低。未来应在群落内人为创造更多林窗、疏林等适生生境,增加华木莲小径级个体基数,且对群落内竞争力较强的毛竹和常绿非濒危树种进行适当择伐,缓解华木莲中、大径级个体的种间竞争压力,以促进华木莲天然种群良性发展。
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 competition(with a competition index of 1321.96,accounting for 59.48% of the total competition index),and most of the interspecific competition is attributed to Phyllostachys 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 competition intensity,decreases with increasing diameter at breast height(D_(BH)).A D_(BH) of approximately 14 cm serves as a significant turning point in the competition dynamics of S.glauca.During the phase when D_(BH) 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 future,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.pubescens 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.
作者
张称称
林国江
徐佳文
肖智勇
黄康
杨清培
Zhang Chengcheng;Lin Guojiang;Xu Jiawen;Xiao Zhiyong;Huang Kang;Yang Qingpei(Fujian Forestry Vocational and Technical College,Nanping 353000,P.R.China;Jiangxi Academy of Forestry;The Yichun Academy of Sciences;Experimental Center of Subtropical Forestry,Chinese Academy of Forestry;Jiangxi Agricultural University)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2024年第12期40-45,共6页
Journal of Northeast Forestry University
基金
国家自然科学基金项目(32260335)
江西省自然科学基金项目(20232BAB215046)。
关键词
濒危机制
生物多样性保护
极小种群
毛竹扩展
阳性树种
Endangered mechanism
Biodiversity conservation
Extremely small populations
Phyllostachys pubescens extension
Intolerant tree species
