摘要
黄龙沟钙化滩流地由于溪流的作用,在滩流地之间形成面积大小不一的植物群落斑块。这些小尺度斑块面积的大小对植物物种数量的影响尚不清楚。应用回归分析法和幂函数方程对黄龙沟钙化滩流地内的物种-面积关系进行了研究。结果表明黄龙沟钙化滩流地中斑块的大小对物种数(含兰科植物)具有强烈的影响,而调查的其他因子对总的植物物种数量的影响不显著。在所调查的环境因子中,斑块面积对物种数量的影响达到79.5%,即斑块越大,所包含的物种数量越多。兰科植物种类数量除了受斑块面积的影响外,还与距离林缘的距离有关(负相关)。物种-面积关系符合幂函数方程S=cAZ的规律。不同的尺度下,z值略有差异,在中等尺度下(1-10 m2)最大,为0.2616,较大尺度下(10-100 m2)的最小,z值为0.2050,小尺度下(<1 m2),z值为0.2382。表明中等尺度的斑块(1-10 m2)包含的物种数(含兰科植物)的增长速度最快,而在斑块面积大于10 m2时,物种数增长速度最小。
In Huanglong valley,plant patches with various sizes were developed among streams in the travertine area.This landscape provides a good opportunity for studying the relationship between patch size and plant species numbers at small scale.To gain basic understanding of the plant diversity pattern and improve our ability to conserve the rich biodiversity in Huanglong valley,we sampled a total of 122 patches,and analyzed the patch size species relationships using multiple regression and power formulation.Our study showed that patch size correlated strongly with species richness.Specifically,large patch had more number of species comparing to small ones.Other ecological factors,i.e.the depth of soil,the moss coverage of the patch and the distance among patches,had no correlation on species richness of patches.However,the distance of the patch to the edge of forest,along with patch size,correlated significantly with orchid species numbers.The relationship between species richness and areas were consistent with the power formulation S=cAZ.The Z values were different with various patch size.The medium patch size（1-10 m2） had the largest Z value（0.2616）,followed by the smallest patch size（S1 m2,Z=0.2382）,and the largest patch size had the lowest Z values（S=10-100 m2,Z=0.2050）.These results indicated that the medium patch size had the highest increase rate on species number accumulation,whereas the largest patch size had the lowest increase rate.
出处
《生态学报》
CAS
CSCD
北大核心
2011年第4期1124-1129,共6页
Acta Ecologica Sinica
基金
国家自然科学基金项目(30770379)
国家林业局推广与科技服务资助项目(67112E1001)
关键词
小尺度
物种丰富度
斑块
兰科植物
biodiversity-area relationship
orchids diversity
small-scale biodiversity pattern
