缙云山风灾迹地恢复群落植物种群生态位研究

Niche Characteristics of Dominant Populations in the Wind-damaged Slash in the Restorable Community of Jinyun Mountain Nature Reserve

以缙云山自然保护区风灾迹地恢复群落5个样地的调查资料为基础,采用生态位宽度、生态位相似比例和生态位重叠值公式,统计分析了风灾迹地恢复群落主要植物种群的生态位特征.研究结果表明:缙云山自然保护区风灾迹地恢复群落中乔木层四川山矾的生态位宽度最大,其次是四川大头茶和白毛新木姜子;灌木层和草本层生态位最宽的是菝葜和狗脊.生态位相似比例值在0.5以上的有74对,占总比例的61.67%,显示了优势种群之间的相似性比例值较大.风灾迹地恢复群落优势种群之间的生态位重叠程度较低,各种群对群落环境资源的分享比较充分,主要种群之间的关系较为协调和平衡,群落也处于相对稳定的状态.

On the basis of field investigation, the niche characteristics of dominant populations in the wind- damaged slash in the restorable Community of Jinyun Mountain Nature Reserve was studied by using the niche breadth, similarity and overlap. The results showed that the niche breadth of Symplocus setchuanensis was highest in the tree layer. The niche breadth of Smilax china was highest in the shrub layer and Woodwardia japonica in herb layer. The niche similarity proportion of 74 species pair was over 0.5, accounting for 61.67% of overall. It showed that the similarity of dominant populations was great. The niche overlap of dominant populations was lower, which showed the populations shared the environmental resource in the community and the relation of dominant populations were balanced. So the restorable community of Jinyun Mountain Nature Reserve was com paratively stable.