川滇高山栎种群不同海拔空间格局的尺度效应及个体间空间关联

川滇高山栎灌丛(Quercus aquifolioides)是我国西南高山典型的植被类型,研究其空间格局对于研究种群的生态学过程有重要意义。为了弄清川滇高山栎种群空间格局及其个体间空间关联对海拔,尺度和大小级等因素的响应情况,研究中应用点格局分析的方法,在巴郎山沿高山栎分布海拔范围设置4个海拔梯度,并根据体积大小将高山栎分为4个大小级等级,比较不同海拔、不同尺度、不同大小级间的高山栎种群空间格局及个体间空间关联。结果表明,川滇高山栎种群空间格局及其个体间关联与空间尺度、植株形体大小和海拔梯度密切相关:在小尺度上,种群趋向于聚集分布,个体间有较强的空间关联,随着空间尺度的增大,种群逐渐趋于随机分布,个体间空间关联减弱,区域无关联;个体间形体差异越小,个体间正关联就越强,个体间形体差异越大,正关联就越弱,负关联就越强;海拔因子对聚集分布的聚集规模和个体间关联的关联程度有较大影响。

Individual association and scale effect of spatial pattern of Quercus aquifolioides populations along the elevation gradients

Quercus aquifolioides scrubs are typical types of vegetation in western Sichuan,China.It is critical to analyze the spatial patterns for its important function on depicting the ecological processes of Quercus populations.Therefore,the spatial patterns of this species were investigated and analyzed,in this study for three main aims:(1) to describe the spatial patterns and individual association changes along with the elevation gradients;(2) to figure out the relationships between the spatial scales and the s...