长白山北坡植物群落相异性及其海拔梯度变化

Dissimilarity of plant communities with changes in altitudes on the northern slope of Changbai Mountain

在长白山北坡 ,从海拔 70 0～ 2 6 0 0m ,每隔 10 0m设置一个样地。运用群落多样性指数 ,分析了在不同海拔 ,两个群落之间 ,不同取样面积之间的差异性。结果表明 ,当取样面积超过 16m2 时 ,在不同取样面积之间 ,群落之间的差异性表现出相同的规律性 ,群落差异性指数出现在海拔 70 0～ 80 0 ,10 0 0～ 110 0 ,170 0～ 180 0m ,这正是不同植被类型的分界点。群落相似性指数随着取样面积的增加呈线性增加。随着海拔差的增加 ,群落相似性指数增加率也是不同的。

From altitude of 700m to 2600m on the northern slope of Changbai Mountain, twenty plots were investigated with an interval of 100 m in altitude.With community dissimilarity index, the dissimilarity among sampling plots at different altitudes was analyzed. The results indicated that dissimilarity between communities showed the same law under different sampling areas when it was over 16m 2. Several summit values of community dissimilarity index at the altitudes between 700～800m, 1000～1100,1700～1800 and 1900～2000m were exactly the boundary of different vegetation types. The average value of community dissimilarity index linearly decreased with the increasng sampling areas. Dissimilarity Index between communities varied with the altitude difference. When sampling area was 1m 2 or 4m 2, Communities dissimilarity index was close to 1 as the altitude difference was over 800m; so was the case when the sampling area was over 16m 2 as altitude difference was over 1200m. The rate of community dissimilarity index increased with the increasing the altitude difference.