【摘要】 功能性状作为联系植物、环境与生态系统的桥梁,对研究植物适应不同生境的策略意义重大。本研究以重庆主城区中华蚊母树(Distylium chinense)、鸡爪槭(Acer palmatum)、檵木(Loropetalum chinense)、构树(Broussonetia papyrifera)、银杏(Ginkgo biloba)、玉兰(Magnolia denudata)为对象,遴选植物功能性状及生物量分配指标,定量分析了其在不同城市环境下的差异性,旨在考查植物对于城市生态环境的适应策略。结果表明:除比叶面积和生物量分配比例外,其他功能性状包括营养器官和生殖器官随乡-郊-城环境梯度发生显著变化(P<0.05),表现为其数值随环境梯度显著下降;除鸡爪槭外,其余5种植物分配给繁殖器官的资源最多,分配给茎的资源最少;根据植物功能性状主成分分析,将6种植物分为3类:营养器官和生殖器官基本未受城市环境影响类,营养器官未受影响而生殖器官受损类,以及营养和生殖器官均受损类;植物功能性状综合评价显示,在森林公园中植物性状表现最好,郊区公园次之,城市公园中最差。更多还原

【Abstract】 Plant functional trait is of great significance to examine the adaptation strategies of plant species. In this study,we measured functional traits including both vegetative and reproductive organs and biomass allocation of six common plant species in Chongqing,including Distylium chinense,Acer palmatum,Loropetalum chinense,Broussonetia papyrifera,Ginkgo biloba,and Magnolia denudate under different habitats,aiming to examine their adaptation strategies in urban environment. The results showed that the functional traits except specific leaf area and biomass allocation were significantly different( P < 0.05),with their values decreased along the rural-suburban-urban gradient. Except for Acer palmatum,all species allocated the most biomass to reproductive organs and least to stems. Based on the results of principal component analysis of functional traits,the six species could be divided into three categories. The vegetative and reproductive organs of urban-adapted group were basically unaffected by the urban environment. The vegetative organs of the semi-urban-adapted group were little affected while the reproductive organs obviously affected. Both vegetative and reproductive organs of the urban-unadapted group were severely affected. The overall evaluation on functional traits showed that the performance of plants living in forest parks near country was the best,followed by those in suburban parks,and those in urban parks the worst.更多还原