title: [Natural regeneration of young Excentrodendron hsienmu in karst mountainous region in Southwest Guangxi, China].
abstract: A field survey was conducted in the karst mountainous region in Pingguo County of Southwest Guangxi, China to explore the structural characteristics, spatial distribution pattern, and growth dynamics of young Excentrodendron hsienmu as well as the main environmental factors affecting the natural regeneration of the E. hsienmu population. In the study area, the population structure of the young E. hsienmu was stable, and exhibited a clumped spatial pattern for the seedlings and seedling sprouts. The ground diameter growth and height growth of the young E. hsienmu presented the same variation trend, i. e., the ground diameter increased with increasing height. The ground diameter growth and height growth of the E. hsienmu seedlings were limited by population density, i. e., decreased with increasing population density. The correlation analysis showed that the trees more than 2.5 m in height and the shrubs were the major stand factors affecting the natural regeneration of young E. hsienmu, while the herbs had no significant correlation with the regeneration. The percentage of covered rock also had no significant effects on the regeneration. Kruskal-Wallis ANOVA showed that there existed significant differences in the height and ground diameter of young E. hsienmu at different slope degrees and slope positions. The population density, height, and ground diameter had significant differences across slope aspects. The natural regeneration of young E. hsienmu was comprehensively affected by the species biological characteristics, intraspecific competition, interspecific competition, heterogeneous habitat, and anthropogenic disturbances.
authors.affiliation: Guangxi Forestry Research Institute, Nanning 530002, China. ozhiyang@126.com
authors.forename: Zhi-Yang
authors.initials: ZY
authors.lastname: Ou
authors.affiliation: College of Forestry, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Zhi-Yao
authors.initials: ZY
authors.lastname: Su
authors.affiliation: Guangxi Forestry Research Institute, Nanning 530002, China.
authors.forename: Yu-Hua
authors.initials: YH
authors.lastname: Peng
authors.affiliation: Guangxi Forestry Research Institute, Nanning 530002, China.
authors.forename: Qin-Fei
authors.initials: QF
authors.lastname: Hu
authors.affiliation: Guangxi Forestry Research Institute, Nanning 530002, China.
authors.forename: Xiao-Rong
authors.initials: XR
authors.lastname: Huang
mesh_terms: D000531:Altitude; D002681:China; D003247:Conservation of Natural Resources; D017753:Ecosystem; D005052:Eucalyptus / Q000254:growth & development; D016468:Forestry / Q000379:methods; D028223:Pinus / Q000254:growth & development; D011157:Population Dynamics; D036226:Seedlings / Q000254:growth & development*; D014197:Trees / Q000254:growth & development*