辉河保护区草甸草原群落最小面积的确定

采用4种饱和曲线方程拟合群落种-面积曲线,对辉河保护区内草甸草原植物群落的最小面积进行了研究。研究结果表明:(1)S=c-ae~(-bA)模型的拟合的相关系数最大,拟合效果比其他三种模型的拟合效果好,且准确性高。采用该模型计算的草地植物群落最小面积与实际相符;(2)当比例因子P(0P1)取0.6,0.7,0.8时,植物群落的最小面积分别是391、678、1 084 m~2。样方设置为35 m×35 m大小的正方形时,可以满足包括植物群落总物种数的60%,70%,80%中等精度要求。当比例因子P取0.9时,求得群落最小面积是1 777 m~2(45 m×45 m),可以满足包括植物群落总物种数的90%的高等精度要求。

Determination of Minimum Sampling Area for the Meadow Steppe Communities in Huihe Conservation Area

The minimum sampling areas for the meadow steppe communities in Huihe conservation area were studied by fitting community species-area curve relationship using four equations. The results were summarized as follows:(1)The S=c-ae-bA model was the best in fitting results and had the biggest fitting correlation coefficient compared with other three models. Using the model to calculate the minimum area of grassland plant communities was real consistent.(2) When the proportional factor was set at 0.6,0.7,0.8,respectively,the minimum area among plant communities was 391 m2,678m2,1 084 m2 (35 m×35 m)at 60%,70%, 80%middle precision level. When the proportional factor was set at 0.9,the minimum area among plant communities was 1 777 m2 (45 m×45 m),which could meet the high accuracy requirements of including 90%of the total plant community species.