Study on the Relationship between Tree Layer and Understory Chimonobambusa szechuanensis in Giant Panda Habitat

In order to explore the correlation between forest community and understory giant panda feeding bamboo in the giant panda habitat of the Daxiangling mountain, the tree layer structure characteristics of forest community and the growth index of Chimonobambusa szechuanensis were investigated, 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 number of bamboo shoots and the diameter of annual bamboo base; the number of trees had significant effects on the number of Chimonobambusa szechuanensis, height of annual bamboo, height of bamboo shoots and base diameter of bamboo shoots; the average height of trees had significant effects on the number of shoots, number of Chimonobambusa szechuanensis, number of dead bamboos, annual and perennial bamboo base diameter. (2) the number of bamboo shoots decreased with the increase of canopy density and average tree height; the number of living bamboos decreased with the increase of the number and average height of trees; the number of dead bamboos increased with the increase of average height of tree; the average height of bamboo, the height of bamboo shoots and the base diameter of bamboo shoots increased with the number of trees; the average base diameter of annual and perennial August bamboo increased with the increase of average tree height.