湖北省荻群落分布特点和种群密度的初步调查

荻具发达根茎及不定根系,是优良的固土护坡植物,也具有耐淹能力,可应用于河流岸坡和水库消落带的水土保持。根据对湖北省荻分布的考察结果,将其生态分布划分为湿地植被类型、石漠化和丹霞地貌植被类型与山地植被类型。荻主要呈斑块状分布于池塘、沟渠和耕地边缘、森林边缘,面积从几平方米到几千平方米不等,森林内部没有其踪迹。湖北省荻种群密度一般为51.7~73.4株/m2,仅大柳和丹江口种群密度低于50株/m2。人为破坏生态环境,限制荻根茎的扩展是影响其分布的主要因素。在江汉平原荻生存空间狭小,将导致其一些重要的生态型和基因型的消失,该物种的遗传多样性将逐渐狭窄而成为濒危植物。

Preliminary Survey on Distribution Characteristics and Population Density of Miscanthus sacchariflorus Community in Hubei Province

Having robust rhizome,adventitious root systems and capability of submergence tolerance,Miscanthus sacchariflorus is an excellent plant for soil-fixation and slope protection and can be applied for soil and water conservation of bank slopes in rivers and hydro-fluctuation belt of reservoirs.According to the investigation results of Miscanthus sacchariflorus distribution in Hubei Province,its ecological distribution can be divided into the types of wetland vegetation,vegetation of rocky desertification and Danxia Topography and mountainous vegetation.Miscanthus sacchariflorus mainly distributes in ponds,ditches,canals and the edges of cultivated land and forest in the form of spots with different areas from several square meters to several thousands square meters.But it does not distribute in forest interior.Usually the population density of Miscanthus sacchariflorus in Hubei is 51.7 ~ 73.4 plant per square meters and less than 50 plant per square meters in Daliu and Danjiangkou.The main influence reason is that the human activities distroyed ecological environment and limited root growth of Miscanthus sacchariflorus.The reduction of living space of Miscanthus sacchariflorus in Jianghan Plain would lead to the disappearing of some important ecotypes and genotypes,then those species will be extinction for genetic diversity is getting less.