采用系统发育的祖先性状重构软件RASP(Reconstruct Ancestral State in Phylogenies),首次使用扩散隔离分析的统计学方法(Statistical Dispersal-Vicariance Analysis,S-DIVA)和Binary Bayesian MCMC(BBM)方法,选择粗糙西风芹(Seseli sq...采用系统发育的祖先性状重构软件RASP(Reconstruct Ancestral State in Phylogenies),首次使用扩散隔离分析的统计学方法(Statistical Dispersal-Vicariance Analysis,S-DIVA)和Binary Bayesian MCMC(BBM)方法,选择粗糙西风芹(Seseli squarrulosum)和竹叶西风芹(S.mairei)为外类群,对来自中国的26个柴胡属植物的核糖体内转录间隔区(Internal Transcribed Spacer,ITS)和叶绿体rps16序列进行分子系统分析。结果表明,ITS和rps16序列集所构建的重要节点中,祖先分布区概率占绝对优势的是中国南方地区,推测中国南方是中国柴胡属的起源中心,且时间—事件(Time Event,TE)曲线结果表明距今20和2.5百万年(20和2.5 Ma Bp)出现扩散峰值,在15 Ma Bp出现谷值,推测其20 Ma Bp(庐山亚冰期),南方和北方种类交流隔离,中国北方分布类型为主体的类群,以散点式的分布,南方分布类型为主体的类群,形成次生分化中心,并按照一定的路径向外扩散,形成对外扩散的高峰期;15 Ma Bp时,以南方为冰期的避难所,出现扩散的低谷期;2.5 Ma Bp(大理亚冰期)左右,因为青藏高原的隆起,中国柴胡属种类再一次发生物种多样化和形成向外扩散的高峰期。展开更多
Wetland parks play various ecological roles,including maintaining regional ecological balance,and connoting and compensating water sources.Taking Harbin Qunli National Urban Wetland Park as the research object,the div...Wetland parks play various ecological roles,including maintaining regional ecological balance,and connoting and compensating water sources.Taking Harbin Qunli National Urban Wetland Park as the research object,the diversity of plant resources in wetland parks is investigated and analyzed with the goal of providing a scientific basis for ecological restoration and the conservation and utilization of urban wetlands.Field survey,sampling and data collection methods were used to study the wetland plant resources and their life types(e.g.,vines or shrubs),ecological types and distribution types.The study found 60 families,129 genera and 160 species of wetland plants in Qunli National Urban Wetland Park,including 56 families,123 genera and 151 species of angiosperms,which include 48 families,101 genera and 127 species of dicotyledons and 8 families,22 genera and 24 species of monocotyledons;2 families,2 genera and 3 species of ferns;and 2 families,4 genera and 6 species of gymnosperms.The family composition is dominated by those families that included 10 or more species,and the dominant families are Compositae and Rosaceae.The genus composition is dominated by genera with four or more species present,and the dominant genera are Acer,Malus and Artemisia.Among the six life types,herbaceous plants are dominant,with a proportion of 62.50% of the species.The ecological types are divided into three categories:wet,mesophytic and aquatic plants,with wet plants accounting for the largest proportion,i.e.,56.25% of the total number of plant species.There are five distribution types of plant families and 10 types of the genera,with both families and genera dominated by the Northern Temperate types,so the flora has obvious temperate characteristics.展开更多
文摘采用系统发育的祖先性状重构软件RASP(Reconstruct Ancestral State in Phylogenies),首次使用扩散隔离分析的统计学方法(Statistical Dispersal-Vicariance Analysis,S-DIVA)和Binary Bayesian MCMC(BBM)方法,选择粗糙西风芹(Seseli squarrulosum)和竹叶西风芹(S.mairei)为外类群,对来自中国的26个柴胡属植物的核糖体内转录间隔区(Internal Transcribed Spacer,ITS)和叶绿体rps16序列进行分子系统分析。结果表明,ITS和rps16序列集所构建的重要节点中,祖先分布区概率占绝对优势的是中国南方地区,推测中国南方是中国柴胡属的起源中心,且时间—事件(Time Event,TE)曲线结果表明距今20和2.5百万年(20和2.5 Ma Bp)出现扩散峰值,在15 Ma Bp出现谷值,推测其20 Ma Bp(庐山亚冰期),南方和北方种类交流隔离,中国北方分布类型为主体的类群,以散点式的分布,南方分布类型为主体的类群,形成次生分化中心,并按照一定的路径向外扩散,形成对外扩散的高峰期;15 Ma Bp时,以南方为冰期的避难所,出现扩散的低谷期;2.5 Ma Bp(大理亚冰期)左右,因为青藏高原的隆起,中国柴胡属种类再一次发生物种多样化和形成向外扩散的高峰期。
基金The Key Scientific Research Projects of Jiamusi City(200119)。
文摘Wetland parks play various ecological roles,including maintaining regional ecological balance,and connoting and compensating water sources.Taking Harbin Qunli National Urban Wetland Park as the research object,the diversity of plant resources in wetland parks is investigated and analyzed with the goal of providing a scientific basis for ecological restoration and the conservation and utilization of urban wetlands.Field survey,sampling and data collection methods were used to study the wetland plant resources and their life types(e.g.,vines or shrubs),ecological types and distribution types.The study found 60 families,129 genera and 160 species of wetland plants in Qunli National Urban Wetland Park,including 56 families,123 genera and 151 species of angiosperms,which include 48 families,101 genera and 127 species of dicotyledons and 8 families,22 genera and 24 species of monocotyledons;2 families,2 genera and 3 species of ferns;and 2 families,4 genera and 6 species of gymnosperms.The family composition is dominated by those families that included 10 or more species,and the dominant families are Compositae and Rosaceae.The genus composition is dominated by genera with four or more species present,and the dominant genera are Acer,Malus and Artemisia.Among the six life types,herbaceous plants are dominant,with a proportion of 62.50% of the species.The ecological types are divided into three categories:wet,mesophytic and aquatic plants,with wet plants accounting for the largest proportion,i.e.,56.25% of the total number of plant species.There are five distribution types of plant families and 10 types of the genera,with both families and genera dominated by the Northern Temperate types,so the flora has obvious temperate characteristics.
