Biomass and factors ofPinus massoniana based on path analysis
Forest biomass is influenced by multiple factors. The growth of trees shift in strategy altered with change of temperature and precipitation even for the same tree species in different regions, which would remodel the biomass allocation patterns. 150 pieces of masson pine(Pinus massoniana)grown in south China were studied. And the related information of the sample trees were recorded including spatial location(longitude and latitude), mean annual temperature ( MAT ), mean annual precipitation ( MAP ), tree diameter at breast height(DBH)and tree height , tree barks, stems, branches, foliage and roots. The one-way ANOVA and path analysis methods were employed to investigate the relationship between organs biomass with the influencing factors. Coefficient of variation based on the results of path analysis was used to test biomass sensitive degree to change in temperature and precipitation of organs difference and regional difference. The results showed that the sensitivity of biomass to the increasing MAT varied with organs which was in a sequence as roots> branches> bark> stems> foliage. While for the sensitivity to the increasing MAP, it was arranged as barks> branches> foliage> roots> stems. The sensitivity of masson pine biomass to changes in MAT and MAP also was significant difference in regions which presented a pattern of northern subtropics> mid-subtropics> southern subtropics with a decreasing difference from north to south. Organs biomass is significantly correlated with DBH and tree height (P < 0.05). P. massoniana biomass was found to have significant correlations with DBH (P < 0.001), which had the greatest direct influence coefficients with values close to 1. Whereas, tree height that exerted influence on biomass through DBH had the greatest indirect influence coefficients close to 1.
biomasspath analysiscoefficient of variationPinus massoniana
NETL
NSTL
万方数据
维普
