Biomass Model Of Caragana Korshinskii Based On Site Factors And Their Interaction

As one of the important realization paths to achieve carbon neutrality,it is very crucial to account forest carbon sinks accurately.Biomass models are considered as an important mean to estimate forest biomass and carbon storage.In this study,nonparametric two-factor variance analysis was used to analyze the effects of aspects and degrees of slope to Caragana korshinskii shrub biomass(total biomass,above-ground biomass,stem biomass,foliage biomass and root biomass).Then biomass models of different shrub organs were established based on site factors and their interaction as the dummy variables.Results showed that:(1)In this study,slope aspect and slope were used as control variables,the six factors(Dt、H、C、A、Dt2H、V)selected in this paper showed a very significant positive correlation with the biomass of five types of Caragana shrubs at the level of 0.01(P<0.01),Therefore,the above six factors were selected as independent variables to establish shrub biomass model;(2)The analysis of variance showed that except that the interaction of slope direction and slope had no significant effect on Caragana foliage biomass(P=0.399),slope direction,slope and their interaction had significant effects on other types of biomass(P<0.01).Therefore,it is necessary to consider site factors and their interaction to establish shrub biomass model;(3)Among the various biomass models of Caragana korshinskii,the biomass model based on the product of the sum of squares of total basal diameter and average height(Dt2H)as the independent variable(Wi=a+bxi)has higher fitting accuracy;(4)Using slope aspect,slope and their interaction as dummy variables can significantly improve the prediction ability of the model.For foliage biomass,slope as dummy variable is the best,while for other biomass,the interaction between slope aspect and slope as dummy variable is the best;(5)Based on site factors and their interactions,the prediction models of total biomass,abovementid biomass,stem biomass,foliage biomass and root biomass of Caragana korshinskii shrubs were established.The results of this study can provide a basis for accurate estimation of shrub biomass of Caragana korshinskii.