Comparative Analysis And Environmental Interpretation Of The Biomass Distribution Of Simao Pine Natural Forest In Typical Section

In this study,Simao pine(Pinus kesiya var.langbianensis)natural forests of three typical sites were investigated as the research object in Pu'er City,Yunnan province.The basic tree factors,partial biomass,terrain factors and soil sample data of 45 plots and 128 sample trees were actually measured in three typical sites.Based on the measured data,the each dimension biomass of Simao pine natural forest was calculate,and its distribution law was analyzed in three typical sites.Based on the each dimension biomass of Simao pine natural forest,environmental factors(terrain factors,stand factors and soil factors),and correlation analysis and canonical correspondence analysis(CCA),the relationship between the each dimension biomass and environmental factors was analyzed.The environmental interpretation of the biomass distribution for Simao pine natural forest was given.The results showed that:(1)The distribution law of each dimension biomass in Simao pine natural forestIt was found through the comparison of the each dimension biomass for Simao pine natural forest that the biomass and percentage distribution low of each layer forest had the following order: arbor layer > litter layer(except root biomass and percentage)>shrub layer > herb layer,among them,arbor layer biomass was dominant(above92.78%).The biomass and percentage distribution low of each organ in arbor layer showed the following trend: wood > root > branch ? bark > leaf,among them,the wood biomass was dominant(above53.02%).The percentage of the total biomass in arbor layer do the the each organ biomass of Simao pine in arbor layer and other tree species occupy had the following order: Simao pine > other tree species,among them,Simao pine was dominant.In addition,the each dimension biomass and percentage distribution of Simao pine natural forest was also different in three typical sites.The biomass and percentage of shrub layer and herb layer for Simao area were dominant in shrub layer and herb layer of three typical sites.The aboveground biomass and its percentage and the total biomass and its percentage for arbor layer and forest stand of Lancang county,in addition,the wood of each dimension biomass in arbor layer,the total biomass on the aboveground of each dimension biomass and the total biomass of each dimension biomass of Lancang country were all dominant in three typical sites.The bark biomass percentage of the each dimension for arbor layer,the leaf biomass percentage of Simao pine and arbor layer and the percentage of the total biomass in arbor layer do the the each organ biomass of arbor layer occupy for Mojiang county were all dominant in three typical sites.(2)The environmental interpretation of each dimension biomass distribution for Simao pine natural forestIt was found through the CCA between the each dimension biomass of Simao pine natural forest and terrain factors that the cumulative interpretation amounts of the first two axes were more than 86.9%.In the two-dimensional diagram of CCA,altitude(Alt)and aspect(ASP)had a significant effect on the each dimension biomass of Simao pine natural forest.It was found through the correlation analysis between the each dimension biomass of Simao pine natural forest and terrain factors that the each dimension biomass showed a basically decreasing trend with the increase of altitude.It was found through the CCA between the each dimension biomass of Simao pine natural forest and stand factors that the cumulative interpretation amounts of the first two axes were more than 93.3%.In the two-dimensional diagram of CCA,stand density index(SDI),average height(Hm),dominant height(Ht),site index(SI)had a significant effect on the each dimension biomass of Simao pine natural forest.It was found through the correlation analysis between the each dimension biomass of Simao pine natural forest and stand factors that the each dimension biomass showed a basically increasing trend with the increase of stand density index(SDI),average height(Hm),dominant height(Ht).It was found through the CCA between the each dimension biomass of Simao pine natural forest and soil factors that the cumulative interpretation amounts of the first two axes were more than 84.7%.In the two-dimensional diagram of CCA,soil pH(pH),total phosphorus(TP)had a significant effect on the each layer biomass of Simao pine natural forest,available kalium(SK)and hydrolytic nitrogen(HN)had a significant effect on the each organ biomass of arbor layer.It was found through the correlation analysis between the each dimension biomass of Simao pine natural forest and soil factors that the each dimension biomass showed a basically increasing trend with the increase of soil pH(pH).According to the environmental factors,altitude(Alt),aspect(ASP),stand density index(SDI),average height(Hm),dominant height(Ht),soil pH(pH),total phosphorus(TP),hydrolytic nitrogen(HN),kalium(SK)had a significant effect on the each dimension biomass of Simao pine natural forest.