黑龙江省森林植物园水曲柳风景游憩林林下植被生态位研究

对黑龙江省森林植物园水曲柳风景游憩林林下植被的主要植物种群的生态位宽度、生态位相似比例和生态位重叠分析表明,山丁子、长白忍冬、水曲柳、家榆、糖槭和接骨木生态位宽度值较大,上层林分主要树种水曲柳林下更新苗生态位宽度比其他植物种林下更新苗的生态位宽度较高,水曲柳更新程度较好。林下植物种群的生态位相似性比例值和生态位重叠值相对较低。说明不同种群间对资源的竞争相对不剧烈,可采取人工措施改善树种的配置,促进生态位分离。

Research on Undergrowth Vegetation Niche of Fraxinus Mandshurica Recreational Forest in Forest Botanical Garden of Heilongjiang Province

The niche breadth,niche similarity proportion and niche overlap of the main plant population in undergrowth vegetation of the Fraxinus mandshurica recreational forest in Botanical Garden of Heilongjiang Province were analyzed.The results showed that the niche breadth value of Malus baccata,Lonicera ruprechtiana,Fraxinus mandshurica,Ulmus pumila,Acer Saccharum and Sambucus williamsii was large.The upper layer stand of regeneration seedlings below Fraxinus mandshurica had a higher niche width compared with them of other vegetations,which promoted the regeneration of Fraxinus mandshurica in return.The niche similarity proportion and niche overlap of the undergrowth population was comparatively low,indicating that the resources competition was less severe among different populations.Therefore,the collocation of tree species could be optimized to promote the niche separation with artificial measures.