不同光照条件下聚花过路黄的克隆构型和分株种群特征
摘要： 以都江堰灵岩山常绿阔叶林林下、林缘和林缘旷地3种不同光照环境中匍匐茎草本聚花过路黄(Lysimachia congestiflora)为对象,对其匍匐茎节间长、分枝强度、分枝角度、分株种群密度、分株种群生物量等指标进行了测定和分析.结果表明,聚花过路黄的匍匐茎节间长、分枝强度、分株种群密度和分株种群生物量在3种生境间差异显著.Kruskal Wallis检验表明,匍匐茎节间长度和分枝角度的频次分布在3种生境间差异显著.3种生境中匍匐茎节间长度分布偏斜度(skewness)的大小分别为:林缘旷地>林缘>林下.林缘旷地与林缘和林下生境在分枝角度、分株种群高度和分株种群根冠比差异显著,而且林缘旷地生境中分枝角度分布偏斜度最小.林缘和林下生境在分枝角度、分株种群高度和分株种群根冠比差异不显著.从林缘旷地、林缘到林下,聚花过路黄的克隆构型和分株种群特征发生了相应改变.结合克隆植物对资源的利用对策,讨论了不同生境中聚花过路黄克隆构型和分株种群特征可塑性的生态适应意义.
关键词: 聚花过路黄, 光照强度, 克隆构型, 分株种群特征
Abstract: The response of clonal architecture and ramet population characteristics to resource heterogeneity is of great ecological significance.This paper studied the variations of clonal architecture and ramet population characteristics of stoloniferous herb Lysimachia congestiflora growing at the open land of forest edge,forest edge,and forest understory of evergreen broad-leaved forest in Mt.Lingyan of Dujiangyan,Sichuan Province,and compared the stolon internode length,frequency distribution of stolon internode length,braching intensity,branching angle,frequency distribution of branching angle,ramet population density,ramet population height,ramet population biomass,and root/shoot of ramet population among the three habitats.The results showed that the stolon internode length,branching intensity,ramet population density and ramet population biomass were different among three habitats.Kruskal Wallis test indicated that the distributions of stolon internode length and branching angle were significantly different among three habitats.The skewness in distribution of stolon internode length was in the order of open land of forest edge>forest edge>forest understory;and the branching angle,ramet population height,and root/shoot of ramet population were significant greater in open land of forest edge than in forest edge and forest understory.The skewness in distribution of branching angle in open land of forest edge was smaller than that in forest edge and forest understory.The branching angle,ramet population height,and root/shoot of ramet population were not significantly different between forest edge and forest understory.These results were discussed in the context of resource acquisition strategy by clonal plants.
Key words: Lysimachia congestiflora, Light intensity, Clonal architecture, Ramet population characteristics
中图分类号:
Q948.11
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