生态学报2017，Vol.37Issue(9)：3164-3171,8.DOI:10.5846/stxb201601240162
桂林喀斯特地区克隆生长红背山麻杆种群的点格局分析
Spatial point pattern analysis of Alchornea trewioides population clonal growth in the karst area of Guilin
摘要
Abstract
The spatial distribution patterns and associations of plant species result from both abiotic and biotic interactions,which may reflect factors and processes that nearly all plants experience;namely resource availability constraints,limits to propagule dispersal,and intra-or inter-specific competitive interactions.In the karst area of Guilin,China,Alchornea trewioides (Benth.) Muell.Arg.is a common pioneer species;to determine the importance of its ecological function in this community,it is critical to analyze the spatial patterns of its individuals.To this end,the spatial pattems of A.trewioides were investigated in situ and analyzed with three objectives:(1) to describe the spatial patterns and individual-association changes among the different diameter classes;(2) to quantify and reveal the relationship between the spatial scale and the spatial patterns for this species;and (3) to analyze the effects of different diameter classes on the spatial patterns and the individual associations.In this study,we set up six plots,each 10 m × 10 m,in the karst habitat (i.e.,calcium-rich,alkaline soil with low water-holding capacity,high ratio of exposed (80％),and prone to periodic flooding),wherein we recorded and mapped all live individuals of A.trewioides.To identify the differences and associations between these individual plants,they were divided into three diameter classes Ⅰ (diameter ≤0.5 em),Ⅱ (0.5 cm ＜ diameter ≤ 1.0 cm),and Ⅲ (diameter ＞ 1.0 cm).The point-pattern analytical approach has proven effective and useful elsewhere to study the plant population characteristics and the community structure underlying ecological processes.On the basis of Ripley's K function,we used the g (r) function statistic to explore differences in the distribution patterns.We also used the L (r) function statistic to examine the spatial associations among the three diameter classes.The results showed that the spatial patterns and their individual associations were closely related to the spatial scale and diameter class tested:(1) At the scale of 2 m,the A.trewioides population had a clumped distribution,whereas at a much larger scale it had a random distribution.(2) The different diameter classes were another important factor that affected the spatial associations.As the diameter classes of individuals were gradually increased,the changing spatial associations between individuals went from positive,to independent,and then to a negative correlation.(3) On a large spatial scale,the mother plants Ⅲ played a significant role in inhibiting the cloning of other smaller ramet plants.However,as the differences among the three diameter classes increased,the spatial association gradually showed a correlation that was independent,or even a negative.Comparing the spatial distribution patterns among diameter classes Ⅰ and Ⅱ,Ⅱ and Ⅲ,and Ⅰ and Ⅲ,the last class showed the strongest negative association in the population that we studied.关键词
红背山麻杆/克隆生长/空间点格局/空间关联性/桂林喀斯特地区Key words
Alchornea trewioides/clonal growth/spatial pattern/spatial association/karst hills of Guilin引用本文复制引用
梅军林,庄枫红,马姜明,覃扬浍,梁士楚,姜勇..桂林喀斯特地区克隆生长红背山麻杆种群的点格局分析[J].生态学报,2017,37(9):3164-3171,8.基金项目
国家自然科学基金(31660197,31160156) （31660197,31160156）
广西自然科学基金(2014GXNSFAA118108) （2014GXNSFAA118108）
珍稀濒危动植物生态与环境保护教育部重点实验室主任基金(ERESEP2015203) （ERESEP2015203）
岩溶生态与环境变化研究广西高校重点实验室开放基金(YRHJ16K001,YRHJ15K003) （YRHJ16K001,YRHJ15K003）
广西研究生教育创新计划项目(YCSZ2016047) （YCSZ2016047）
