Biodiversity Recovery of Dendrocalamus giganteus Undergrowth After Clump Logging

Dendrocalamus giganteus was used as the research object. Different methods(conventional selective logging, 1/3 clump logging, 1/2 clump logging, and whole clump logging) were used to explore the effect of clump logging on the recovery of understory vegetation species diversity. The results showed that logging has greatly changed the richness of understory plants and improved the species diversity. There were 39 species belonging to 38 genera of 25 families in the sample plots before logging. Understory species showed an overall increasing trend after logging, the number of species in the third year of recovery is the most, with 71 species of plants belonging to 65 genera of 37 families, and the total number of species has increased by 82.05% compared with the condition before logging. The effect of different clump logging on the species composition of understory plants was as follows: 1/2 clump logging > conventional logging > 1/3 clump logging > whole clump logging. The species diversity index of understory vegetation in 4 logging test areas is relatively high, specifically, the index of the 1/2 clump logging area being the largest, which was followed by that of conventional logging area. The index in 1/3 clump logging area was in the 3^rd place, and the species diversity of understory vegetation in whole clump logging area was the lowest. In summary, the comprehensive indicators of 1/2 clump logging showed that the species diversity of understory plants was the best. Therefore, when logging D. giganteus forests, 1/2 clump logging can be used as a reference for the protection of understory biodiversity.