喀斯特地区不同石漠化程度不同坡度下火棘种群分布格局分析-西南大学.doc

茂兰喀斯特森林不同演替阶段优势乔木种群生态位研究 覃弦，龙翠玲(，李娟 （贵州师范大学地理与环境科学学院，贵阳550001） 摘要：以贵州茂兰国家级喀斯特森林自然保护区三个演替阶段的乔木层优势种群为研究对象，通过典型样方调査，运用Levins和Pianka公式计算各种群生态位宽度和生态位重叠值。结果表明：樟叶槭、革叶铁榄、翅荚香槐、石岩枫、齿叶黄皮、皱叶海桐、狭叶润楠7个种群生态位宽度较大，在3个演替阶段均有出现。樟叶槭、石岩枫和齿叶黄皮分别是演替早期、演替中期和演替晚期的优势种群，具有最大的生态位宽度。演替早期重叠值大于0.70的种对有55对，而演替晚期重叠值大于0.70的种对有98对，表明随着演替的进展，种群的生态位重叠增强。在演替过程中生态位宽度与生态位重叠之间的关系复杂，生态位宽度呈下降趋势而生态位重叠值呈上升趋势，二者间没有相关性。 关键词：茂兰；喀斯特森林；生态位宽度；生态位重叠；演替阶段 Analysis on ecological niche of dominant arbor population in different succession stages in karst forest in Maolan Nature Reserve QIN Xian , LONG Cui-ling*, LI Juan (School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, Guizhou 550001, China) Abstract: The dominant populations of tree layer in the three succession stages of Karst forest in Maolan Nature Reserve in Guizhou were studied，Through the typical samples survey, niche breadth and niche overlap of arbor population were calculated by using the Levins and Pianka formula. the results showed that the niche breadth of seven species such as Acercinn amomifolium, Sinosideroxylon wightianum, Cladrastis platycarpa Makino, mallotus repandus, Clausena dunniana, Pittosporum crispulum Gagnep and Machilus rehderi Allen were larger, and they were all appeared in three succession stages. Acercinn amomifolium, Sinosideroxylon wightianum and Cladrastis platycarpa Makino were the dominant species in early succession, mid-succession and late succession stages respectively, and had the highest niche breadths among all species. There were 55 species pairs, niche overlap were much than 0.7 in early succession stage, but there were 98 species pairs in the late succession stage. It indicated that niche overlap were intensify with the community succession. The relation between niche breadths and niche overlap was complex during the succession process. Niche breadths was on a declining curve but niche overlap was on the rise. There were no correlation between them. Key words: Maolan; karst forest; niche b