Mixed coniferous-broadleaved forests are typical types of vegetation in northwest Yunnan. It is meaningful to analyze the spatial patterns for its important function on protecting biodiversity and depicting the ecological processes of mixed coniferous-broadleaved forests.
To reveal the mechanisms of species coexistence of mixed coniferous-broadleaved forests in Meili snow mountain, method of point pattern analysis was used in this study. This study researched age-classes, spatial distribution patterns and associations of Acer pectinatum and Betula utilis populations with elevation from 2850 to 3250m. The results of the study were as follows: (1)Along the elevation gradients, the age-classes of Acer pectinatum populations basically had no obvious changes, and the aggregation degree of Acer pectinatum populations gradually increased; (2) Along the elevation gradients, the age-classes of Betula utilis populations obviously changed, and the aggregation degree of Betula utilis populations was the highest in mid-elevation(3050m) area; (3) Along the elevation gradients, the spatial associations of Acer pectinatum and Betula utilis had an obvious change. In low elevation(2850m) area, the spatial associations of Acer pectinatum and Betula utilis was positive. In mid-elevation(3050m) area, the spatial associations of the two species changed from no association to negative associations. In high elevation(3250m) area, the spatial associations of the two species changed from no association to positive associations.
The study showed that, In Meili snow mountain area, elevation has an obvious influence on spatial patterns and spatial associations of species; In different elevation area, one species may form different populations with different age-classes, and age-classes of populations may have an influence on spatial patterns and spatial associations of species.
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