鄂尔多斯高原油蒿群落研究基本样方大小的确定

Determination of Minimum Sampling Area for Artemisia Ordosica Community in Ordos Plateau,Inner Mongolia

油蒿群落在鄂尔多斯高原植被类型中占据绝对优势,针对油蒿群落的研究中采用的基本样方大小不一。以鄂尔多斯高原油蒿群落为研究对象,通过野外调查,采用群落种—面积曲线方程进行拟合分析,确定抽样到60%,70%,75%,80%,85%和90%以上的物种数,相对应地要求样方面积为4.77～6.34,10.45～12.62,15.48～18.52,20.20～26.50,25.95～37.12,34.06～50.99m2。结果表明:在样方面积大于4m×4m时,植被盖度的变化较小,趋于稳定。综合种—面积曲线的结果和盖度变化情况,考虑到取样的效率,认为样方面积确定为16m2(4m×4m)是比较合适的,此样方能够包括油蒿群落中全部的常见种,也能较准确地反映群落覆盖地表的状况,在保证样方代表性的同时也能最大限度地控制工作量。

Artemisia ordosica is one of the dominant plant species in Ordos Plateau.However,The minimum sampling area（MSA） for A.ordosica community had been never studied,And the sampling areas in previous studies on A.ordosica community were ununiform.The representation of samling was higher with the increase of sampling area,But it also increased the workload of community investigation.Here MSA for A.ordosica community in Ordos Plateau were studied by fitting 10 community species-area relationship equations.The results showed that the MSA for A.ordosica community including 60%,70%,75%,80%,85% and 90% of community species were about 4.77~6.34 m2,10.45~12.62 m2,15.48~18.52 m2,20.20~26.50 m2,25.95~37.12 m2 and 34.06~50.99 m2,Respectively;And there was no significant change of vegetation cover when sampling area is greater than 4 m×4 m.Therefore,Considering the result of species-area curve and the change of vegetation cover,We figured out that the MSA for A.ordosica community in Ordos Plateau is 16 m2（4 m×4 m）.