Abstract:

Mingling has recently been presented as an index describing tree species separation in a stand including simple mingling, tree species diversity mingling, and tree species spatial status. However, current mingling indices incompletely express the separation relationship among tree species in a spatial structure unit, there is a problem of different mixed structure with equal mingling. This paper proposes complete mingling based on analyzing simple mingling, tree species diversity mingling and tree species spatial status, and their existing problems. Comparative analyses of different mingling indices were carried out based an example of the evergreen broadleaved forest in Tianmu Mountain National Nature Reserve and Voronoi diagram method of GIS. The results show that tree species diversity mingling, tree species spatial status and complete mingling are improved from simple mingling, so differences and relationships exist among them, and mathematical relationships between different mingling indices have been testified. Complete mingling additionally involves tree species separation relationship of the nearest neighbors, and biodiversity Simpson index is introduced into complete mingling. As a result, complete mingling significantly increases resolving power for different mixed structures.

Key words: Tianmu Mountain, evergreen broadleaved forest, mingling, complete mingling, Voronoi diagram