文献类型：期刊文献

中文题名：海南尖峰岭热带山地雨林不同空间尺度和径级水平的物种丰富度与个体密度关联

英文题名：Associations between species richness and individual densities of varying spatial scales and diameter classifications in tropical montane rainforest in Jianfengling, Hainan Island, China

作者：吴裕鹏[1] 许涵[1] 李意德[1] 骆土寿[1] 陈德祥[1] 林明献[2] 杨怀[2]

第一作者：吴裕鹏

机构：[1]中国林业科学研究院热带林业研究所;[2]中国林业科学研究院热带林业研究所试验站

年份：2014

卷号：38

期号：4

起止页码：325-333

中文期刊名：植物生态学报

外文期刊名：Chinese Journal of Plant Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：林业公益性行业科研专项"热带雨林生物多样性维持与自然恢复策略研究(201104057)";中央级公益性科研院所基本科研业务费专项"基于大样地系统的热带森林动态监测研究(CAFYBB-2011004)";国家自然科学青年基金(41201192);中央级公益性科研院所基本科研业务费专项"海南岛热带雨林动态监测大样地建立及监测(RITFYWZX-200902)";国家林业局"尖峰岭生态定位站运行补助";科技部"海南尖峰岭森林生态系统重点野外科学观测研究站运行费"

语种：中文

中文关键词：胸径;个体密度;尖峰岭;空间尺度;物种丰富度;热带山地雨林

外文关键词：diameter at breast height, individual density, Jianfengling, spatial scale, species richness, tropicalmontane rainforest

分类号：Q948.15

摘要：以海南尖峰岭热带山地雨林为研究对象,基于尖峰岭原始林60 hm2大样地,分析了7个不同空间尺度(5 m×5 m、10m×10 m、20 m×20 m、40 m×40 m、60 m×60 m、80 m×80 m、100 m×100 m)、3个不同径级(胸径(DBH)≥1.0 cm、DBH≥2.5 cm、DBH≥7.5 cm)物种丰富度与个体密度之间的关联性,以期为负密度制约效应等研究的尺度选择提供参考依据。研究结果表明,物种丰富度和个体密度之间的关联性是基于空间尺度存在的,并受分析植株径级大小的影响。DBH≥1.0 cm时,在4个空间尺度下(5 m×5 m、10 m×10 m、20 m×20 m、40 m×40 m),物种丰富度随个体密度增加而增加,但物种丰富度和个体密度两者间的相关性随取样空间尺度的增大而逐渐下降;在其他3个空间尺度下(60 m×60 m、80 m×80 m、100 m×100 m),两者间没有显著相关性。当DBH≥2.5 cm和DBH≥7.5 cm时,物种丰富度和个体密度间的相关性随空间尺度变化的趋势也与上述结果基本一致;在60 m×60 m的空间尺度上,DBH≥1.0 cm时物种丰富度和个体密度相关性不显著,DBH≥2.5 cm和DBH≥7.5 cm两个径级的物种丰富度和个体密度表现出弱相关性。DBH≥2.5 cm和DBH≥7.5 cm时,各空间尺度下物种丰富度和个体密度之间的决定系数几乎一致,但高于DBH≥1.0 cm时两者之间的决定系数,说明大径级植株的个体密度和物种丰富度之间有更强的关联性,负密度制约效应和自疏效应可能是产生这种现象的主要原因。
Aims Our objective was to identify the degree of associations between species richness and individual densities of varying spatial scales and diameter classifications. Methods Based on the dataset from a 60 hm2 tropical montane rainforest plot in Jianfengling, Hainan, China, the relationship between species richness and stem density was analyzed at seven spatial scales （5 m × 5 m, 10 m × 10 m, 20 m ×20 m, 40 m × 40 m, 60 m × 60 m, 80 m × 80 m, and 100 m × 100 m） and three DBH（diameter at breast height） classifications （DBH ≥ 1.0 cm, DBH ≥ 2.5 cm, DBH 〉1 7.5 cm）. Important findings The relationship between species richness and stem density varies with the spatial scales and DBH classifications. For all plants with DBH ≥ 1.0 cm, there are significantly positive correlations between species richness and stem density at the spatial scales of 5 m × 5 m, 10 m ×10 m, 20 m × 20 m and 40 m × 40 m, but not at other larger scales. The patterns are similar in the relationship between species richness and stem den- sity after grouping all stems into the three DBH classifications, except there are weak correlations between species richness and stem density forplants with DBH ≥1 2.5 cm and DBH ≥1 7.5 cm at the scale of 60 m × 60 m. The significance levels of the relationship of species richness and stem density are similar between the DBH ≥ 2.5 cm and DBH ≥ 7.5 cm classifications, which are both higher than that ofDBH ≥1.0 cm. It is concluded that the associations between species richness and stem density are stronger for individuals with larger DBH than those with smaller DBH. It is inferred that negative dependence and self-thinning are two possible mechanisms related to the phenomenon.