Study on Distributions and Status and Impact Factors of Ancient Kapok Trees(Bombax ceiba)in Guangdong Province
Based on the census of large ancient famous trees in Guangdong province,this study analyzed the resource characteristics of ancient Bombax ceiba and the underlying factors using Pearson's correlation and linear mixed model.The results showed that there were 1 280 ancient B.ceiba in Guangdong Province,and the age,height,diameter at breast height(DBH),and crown width are mainly concentrated in 100-200 a,12.0-22.0 m,200-400 cm,and 8.0-20.0 m,respectively.The ancient B.ceiba were distributed unevenly across Guangdong province,most of which were recorded in the Pearl River Delta,whereas they were rare in the east-ern,western,and northern parts of Guangdong.The tree height was significantly correlated with most environ-mental factors,but the correlations between the ages of the old kapok trees and tested environmental factors were not significant.DBHs were positively correlated with temperature seasonality and annual temperature range,and the canopies were negatively correlated with annual mean temperature.However,both DBH and canopy were not correlated with slope,aspect,and annual precipitation.To sum up,the ancient B.ceiba is distributed mainly in the Pearl River Delta,including Guangzhou,Dongguan,and Huizhou city.The health status of ancient B.ceiba is generally good.Tree holes,pests and diseases,broken branches,environmental pollutants,and growing space are the main factors that jointly influence the health of ancient B.ceiba.
kapok treespatial distributionhealth statuscorrelation analysisGuangdong province
NETL
NSTL
万方数据
