Study on the Relationship between Tree Layer and Understory Qiongzhuea multigemmia of Forest Community in Giant Panda Habitat

In order to explore the correlation between the tree layer of forest community and understory Giant Panda feeding bamboo in the giant panda habitat, the tree layer structure characteristics of forest community in Daxiangling Giant Panda habitat and the growth index of understory Qiongzhuea multigemmia under forest were investigated by using line transects and quadrat methods, and the generalized linear mixed model (GLMM) and linear hybrid model (LMM) were constructed and analyzed. The results showed that: (1) The canopy density of tree layer had significant effects on the basal diameter of annual, perennial and bamboo shoots, the number of live and dead bamboo, the height of bamboo shoots; the number of trees had significant effects on the number of bamboo shoots, the number of dead bamboo and live bamboo; the average height of trees had significant effects on the number of bamboo shoots, height and base diameter of annual and perennial bamboos. (2) The number of bamboo shoots increased with the increase of number and average tree height; the number of live and dead bamboo decreased with the increase of canopy density and number of trees; the average height of annual bamboo decreased with the increase of the average height of trees; the average base diameter of the annual bamboo decreased with the increase of the canopy density of tree layer and the average height of the trees; the average height and base diameter of the perennial bamboo increased with the increase of the average height of the trees; the height of bamboo shoot increased with the increase of canopy density of tree layer; the average base diameter of perennial bamboo and shoot decreased with the increase of canopy density of tree layer. This study provided a quantitative basis for the restoration of the Giant Panda habitat in this region.