摘要
研究树种的种内种间竞争特性对森林的保护及可持续利用有重要意义。采用相邻网格调查获取数据,用逐步扩大范围的方法确定影响对象木的最佳竞争范围,利用Hegyi竞争模型对龙王山落叶阔叶林优势树种种内和种间竞争强度进行定量分析。结果表明:当样圆半径为7 m时,单位面积的平均竞争强度已经趋于稳定。落叶阔叶林中优势树种有12种,包括小叶白辛树Pterostyrax corymbosus,四照花Cornus kousa,毛山荆子Malus baccata,茅栗Castanea seguinii,灯台树Cornus controversa,玉铃花Styrax obassia,米心水青冈Fagus engleriana,黄山栎Quercus stewardii,青钱柳Cyclocarya paliurus,华山矾Symplocos chinensis,锥栗Castanea henryi,杜梨Pyrus betulaefolia等。各优势树种种内竞争强度不同。其中毛山荆子、小叶白辛树、四照花、米心水青冈种群等的种内竞争比其他优势种要强烈,属于中、强度竞争。这从侧面也反映出毛山荆子、小叶白辛树、四照花、米心水青冈种群等呈现出一定的聚集分布状态。灯台树、玉铃花、华山矾和青钱柳种群等的生态位与小叶白辛树、四照花较接近,故其受到较强的种间竞争压力,灯台树、玉铃花、华山矾和青钱柳种群等的种内竞争小于或接近种间竞争。同时,小叶白辛树和四照花也是其他优势树种最大的竞争者。
To protect and obtain sustainable utilization of a forest,studying intraspecific and interspecific competition is important and meaningful.This research used adjacent grid points to obtain data,and the best competitive scope for the designated forest of Longwang Mountain was determined by expanding gradually.To quantitatively analyze the intraspecific and interspecific competition of the dominant spe cies,the Hegyi Competition Index was used and one typical plot of 100 m × 100 m was surveyed.Results demonstrated that expanding the scope effectively defined dominant trees.The average competition intensity decreased quickly with the increasing of zone in a certain zone while it had a littile decrease beyond the zone.When the sample radius was 7 m,the average for interspecific competition per unit area stabilized with 12 dominant tree species,including Pterostyrax corymbosus,Cornus kousa,Malus baccata,Castanea seguinii,Cornus controversa,Styrax obassia,Fagus engleriana,Quercus stewardii,Cyclocarya paliurus,Symplocos chinensis,Castanea henryi,and Pyrus betulifolia.Intraspecific competition was stronger for Malus baccata,Pterostyrax corymbosus,Cornus kousa,and Fagus engleriana populations than the other dominant species partially because the distribution pattern was clumped.Strong intraspecific competition between species of Cornus controversa,Styrax obassia,Symplocos chinensis,and Cyclocarya paliurus versus species of Pterostyrax corymbosus and Cornus kousa showed that they had similar niche requirements.In addition,Pterostyrax corymbosus and Cornus kousa were the largest competitors of the other dominant species.Thus,Hegyi competition model could provide a reliable basis for studying on intraspecific and interspecific competition of dominant species in a deciduous,broadleaf forest of Longwang Mountain.
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2014年第6期868-876,共9页
Journal of Zhejiang A&F University
基金
浙江省生态环境(2000-2010年)变化遥感调查与评估项目
浙江省公益技术研究项目(2013C33017)
关键词
森林生态学
落叶阔叶林
优势树种
Hegyi竞争指数
龙王山
forest ecology
deciduous broadleaf forest
dominant species
Hegyi Competition Index
Longwang Mountain
