云南药山黄背栎种群不同海拔空间格局分析

Spatial pattern analysis of Quercus pannosa population at different altitudes in Yunnan Yaoshan

黄背栎(Quercus pannosa)是硬叶常绿阔叶林的代表树种之一,具有较强的克隆萌生能力,影响其种群更新和格局特征。通过对云南药山三个不同海拔(2900 m、3100 m、3300 m)的黄背栎种群分布格局展开调查,采用点格局分析法对其不同海拔下克隆株与实生株的格局特征及其相互关系进行了研究。结果表明,克隆株和实生株的种群密度随海拔递减,实生苗在低海拔地段占优势。黄背栎实生株与克隆株在高海拔地段呈集群分布,实生株在小尺度下(0—1 m)集群分布,随尺度的增大逐渐过渡到随机分布;低海拔处克隆株与实生株的空间关系呈显著正相关,高海拔小尺度下二者为正相关,大尺度下呈负相关。

Quercus pannosa is one of the representative species of sclerophyllous evergreen broad-leaved forest,which has strong clonal initiation ability and affects its population regeneration and pattern characteristics.According to investigate Quercus pannosa’s the distribution pattern which is in three different elevation(2900 m,3100 m,3300 m)in Yunnan Yaoshan,and the pattern characteristics and relationship of clonal and solid strains at different altitudes were studied by point pattern analysis.The results showed that the density of clones and solid strains decreased with altitude,and the seedlings were dominant at low altitude.The Quercus pannosa’s solid and clonal strains showed clustered at high altitude areas,and the solid strains were clustered in small scale(0-1 m),but gradually transited to random distribution with the increase of scale.The spatial relationship between the clonal strains and the solid strains was positively correlated at low altitude,and the two were positively correlated in the high altitude small scale,there was a negative correlation in the large scale.