鄱阳湖湿地典型植被对关键水文要素的响应规律研究

为了揭示鄱阳湖湿地植被对关键水文要素的响应规律,综合运用EFDC水动力学模型和高斯模型,建立了湿地植被分布面积对淹没水深、淹没时长和退水时间的响应关系,明确湿地植被对关键水文要素的生态需求。结果表明:鄱阳湖湿地典型植被对这3种关键水文要素的生态阈值点由小到大依次均表现为:芦苇苔草虉草蓼子草,从而形成了芦苇、苔草、虉草和蓼子草由高到低的空间分布格局;苔草的生态幅宽最大,表明其对生境的适宜范围最广、适应能力最强,从而使得其在鄱阳湖的分布范围最广。

Study on the response law of typical wetland vegetation communities to key hydrological elements in Poyang Lake

In order to reveal the response law of wetland vegetation communities of Poyang Lake to hydrological elements,the response curves had been established by using EFDC hydrodynamic model and Gaussian model, and the ecological thresholds of the four typical wetland vegetation communities of Poyang Lake to submerged depth, submerg duration and the beginning time of water recession were quantified, respectively. The results show that the ecological thresholds of the three key hydrological elements of vegetation communities are as follows:Phragmites australis Community < Carex spp. Community < Phalaris arundinacea Community < Polygonum criopolitanum Community, thus resulting in a spatial distribution pattern of this four vegetation communities from high to low. In addition, The range of ecological amplitude of Carex spp. Community is the largest, indicating that it had the widest range of suitable habitat and the strongest adaptability,thus making it have the most widely distributed range in Poyang Lake.