Spatial Structure and Regeneration Count Model of Taxus cuspidata Forests in Muling National Nature Reserve of Heilongjiang Province
To investigate the spatial structure,distribution pattern,and seedling regeneration of Taxus cuspidata populations,the T. cuspidata community in the Muling National Nature Reserve was used as materials,and a standard plot of 300 m×400 m was established,and individual trees were investigated for their species name,growth and spatial position. Spatial structure parameters such as uniform angle index,neighborhood comparison,and mingling degree were calculated. The spatial structure,distribution pattern,and interspecies relationship curves of T. cuspidata populations were analyzed. Four regeneration count models including Poisson,negative binomial,zero-inflated Poisson,and Hurdle-Poisson were further established and compared for the regeneration of T. cuspidata seedlings. The results indicated that:(1)the spatial structure unit of T. cuspidata populations primarily exhibited random distribution,high mingling degree,and high uniformity index,with a relative frequency of 0.6196;(2)the population demonstrated an aggregated distribution at a scale of 0-100 m;(3)a positive correlation was observed for T. cuspidata populations at a scale of 0-150 m,and seedlings showed varying correlations with their maternal trees across different scales,while correlations with other dominant species were relatively low;(4)T. cuspidata seedlings exhibited an aggregated distribution at a scale of 0-25 m,with an optimal regeneration count model being the Negative Binomial model.
Taxus cuspidatastand spatial structurespatial distribution patterninterspecies correlationcounting models
万方数据
维普
