香格里拉2种典型高寒草甸植物丰富度最小取样面积研究

The Minimum Sampling Size for Estimating Species Richness of 2 Types of Typical Alpine Meadows in Shangri-La

于2019年8月在香格里拉市开展种-面积曲线调查,在野外调查基础上,分别用7种模型对2种高寒草甸(中生草甸和湿草甸)的植物种-面积曲线进行拟合、择优,然后用最优拟合模型计算了草甸植物群落、莎草科植物、禾本科植物、菊科植物和其他杂类草植物物种丰富度调查的最小样地面积。结果表明:植物群落、禾本科植物、菊科植物和其他杂类草植物的种-面积关系可用非饱和曲线模型拟合;莎草科植物的种-面积关系可用饱和曲线模型拟合。对香格里拉市中生草甸进行植物丰富度调查时,植物群落的最小样地面积为72.7 m2,禾本科植物的最小样地面积为9.0 m2,莎草科植物的最小样地面积为0.16 m2,菊科植物的最小样地面积为22.3 m2,其他杂类草的最小样地面积为53.2 m2。对香格里拉市湿草甸进行植物丰富度调查时,植物群落、禾本科植物、莎草科植物、菊科植物和其他杂类草植物的最小调查样地面积分别为80.5、3.7、2.25、25.2 m2和51.4 m2。

To clear the minimum sampling size of 2 types of typical alpine meadows, i.e., the mesophyte meadow and wet meadow, in Shangri-La a field survey was conducted in August 2019. Seven models were used to fit species-area curve data that obtained from filed investigations. Then the best model was selected to estimate the minimum sampling size for the species richness of plant community, Gramineae, Cyperaceae, Compositae and other forbs in the mesophyte meadow and wet meadow, respectively. The results showed that the species-area curves of the whole plant community, Gramineae, Compositae and other forbs could be best fitted by unsaturated models, while the species-area curves of Cyperaceae could be best fitted by saturated models. For the mesophyte meadow in Shangri-La, the minimum sampling size for the whole plant community, Gramineae, Cyperaceae,Compositae and other forbs was 72.7, 9.0, 0.16, 22.3 m2 and 53.2 m2, respectively. For the wet meadow, the minimum sampling size for the whole plant community, Gramineae, Cyperaceae, Compositae and other forbs was80.5, 3.7, 2.25, 25.2 m2 and 51.4 m2, respectively.