种-面积曲线三种扩大样地面积的方法比较

本文以雾灵山低山区的人工油松林为例,对种-面积曲线确定植物群落最小面积时,随机设置不同面积样方、逐步扩大样地面积和随机相同面积小样方相加的三种扩大样地面积的方法进行了比较研究.随机设置不同面积样方的方法最佳,研究样地人工油松林群落最小面积为700~750 m2.种-面积曲线的最佳拟合方程为S=6.217 8×ln(2.298 0×A+1),最小面积的最佳拟合方程为A=﹛eSt6.2178-1﹜/2.2980.植物群落最小面积的确定应充分考虑群落的组成、演替等情况,应适当动态调整最小面积值.

Species-area Curves of the Three Methods to Expand Comparative Plot Area

In this paper,we take the example of the low mountains of artificial Wuling Mountain pine forest,on the species-area curve to determine the minimum size of plant communities,the random sets different size plots,and gradually expands the area of different three ways and a random sample of the same size quadrats additive expand the plot area method were compared.Random setting method is the best plots of different three sizes,and through the way we can find the artificial pine forest communities minimum area of 700 ～750 m.Species-area under the curve of best fit equation is S =6.217 8 × ln（2.298 0 ×A ＋ 1）,the best fit equation for the minimum area A ={ eSt/6.2178-1 }/2.Determining the minimum area of plant community should fully consider community composition,succession,etc.,which should be appropriate to the minimum value of the area.