临泽盐渍化草地空间格局的可塑性面积单元问题

The optimum sampling unit area on the spatial distribution pattern of grassland on the saline land in Linze

通过对临泽盐渍化草地群落取样资料的分析表明,草地空间格局的分布对样地尺度变化和划区方案选择均存在敏感性。样地面积在12500m2以下时,尺度增聚效应表现非常明显。在同一取样面积单元下不同的划区方案对草地的空间分布都有一定的影响,但随着取样面积的增大,区划方案的影响也是减少的。因此在研究草地空间分布格局时,要力求寻找一个最佳的区划方案和取样尺度,使得面积单元内的差异最小是非常有必要的。

The spatial distribution of grassland community was studied on the saline land in Linze using different sampling areas and zoning methods. Results showed that the spatial distribution pattern of grassland community was sensitive to sampling sizes and zoning methods. The effect of aggregation was very obvious when the sampling area was under 12500m^2.The different zoning methods had certain effects on the spatial distribution pattern under same sampling sizes. However, the effect of zoning methods on the spatial distribution pattern decreased as sampling area increased. Therefore, it is essential to optimise the sampling areas and select the appropriate zoning methods to minimise the difference between sampling units for the research on spatial distribution of grassland community on saline land.