鄱阳湖湿地典型草洲植物群落种-面积关系

为了解鄱阳湖湿地草洲植物群落的结构,对其3种典型草洲植物群落种-面积关系进行了研究。采用巢式样方法调查植物物种数量,并用3种非饱和曲线拟合种-面积方程。结果表明,基于实测数据,3个草洲物种数随着取样面积的增加先快速增加后趋于平稳;群落最小取样面积均为30 m~2。幂函数模型对3个草洲群落的种-面积关系拟合效果均为最佳,3个草洲群落的RSE分别为0.35、0.35和0.56,AAD分别为0.23、0.17和0.35,AARD分别为0.06、0.02和0.07,而指数模型、Fisher模型的拟合效果一般。指数模型计算得到的不同比例因子下3个草洲最小取样面积与实际情况最为吻合。这为鄱阳湖区进行植物群落数据采集的样方设置提供了理论参考。

Species-area Relationship of Typical Marshland Plant Community in the Wetlands of Poyang Lake Region

In order to understand the plant community structure in wetlands of Poyang Lake, the species-area relationship of three kinds of marshland plant communities were studied. The plant species number was investigated by nested plot method, and the species-area equations were fitted with 3 unsaturation curves. The results showed that based on the actual data, the number of the species rapidly increased at first with increment of sampling area, and then gradually became stable latter on. The size of 30 m² was determined as the minimum sampling area for the plant community. The fit effects of power function model on species-area relationship among 3 studied communities were the best with RSE of 0.35, 0.35, 0.56, AAD of 0.23, 0.17, 0.35 and AARD of 0.06, 0.02, 0.07, respectively; while those of exponential model and Fisher model were ordinary. Compared with the measured data, the minimum sampling areas under different scaling factors for 3 studied communities calculated by exponential model were the fittest to the actual situation. These would provide theory references for sample establishment in data collection of plant community in Poyang Lake Region.