不同群落类型中七子花器官营养元素分布及其与土壤养分的关系

在对大盘山自然保护区七子花(Heptacodium miconioides)群落进行分类的基础上,研究不同群落类型中七子花开花期器官营养元素分布及其与土壤养分的关系。结果表明:(1)不同群落中七子花元素含量有一定的差异,各营养元素含量的变异系数相差很大,其中N、P、K元素含量的变异系数较大,而Ca和Mg的较小。(2)七子花不同器官元素含量大小为:N、P、K的顺序均为叶>皮>枝>干,Ca和Mg均为皮>叶>枝>干;不同器官中,七子花5种营养元素的总量由高到低依次为叶、皮、枝、干;七子花各营养元素含量的变异系数相差较大,其中叶、皮和枝的较高,而干的较低。(3)七子花植物体元素含量与土壤中的营养元素含量的相互关系有一定的规律性,但并不明显,说明不同群落内七子花营养元素含量的差异并不是主要由土壤中营养元素含量决定的,而是其他生境因子影响的结果。基于以上分析认为,土层厚度、岩石裸露率等生境条件所造成的七子花生存状态的差异是不同群落七子花元素含量变化的主要原因。

NUTRIENT ELEMENT DISTRIBUTION IN ORGANS OF HEPTACODIUM MICONIOIDES IN DIFFERENT COMMUNITIES AND ITS RELATIONSHIP WITH SOIL NUTRIENTS

Based on investigations and results of Twinspan classification,20 plots in the Dapanshan Nature Reserve were sorted into five different kinds of communities.To well understand nutrient element distribution of Heptacodium miconioides and its relationship with soil nutrients in those five communities,five nutrient elements in five organs of H.miconioides sampled during its anthesis were measured.Results show:1)Nutrient contents in the plant differed somewhat from community to community,but the differences wer...