Distribution Of Forest Biomass For Main Forest Types In Tahe Forestry Administration Of Daxinganling Based On Geostatistics

Daxinganling is the largest natural forest in China with forest resources and carbon rich reserves,not only plays the role of ecological security barrier,but also plays a vital role in release caused by climate change in response to carbon dioxide.According forest survey data of 2010 in Tahe forestry administration,Tahe forestry administration forest map,DEM data and Tahe forestry administration subcompartment data,in the 125 sampling plots collected,choose 100 sampling plots randomly as training dataset,and the other 25 sampling plots as testing dataset.Use Box-Cox transform to make sure data can follow normal distribution,and spatial autocorrelation analysis is performed using trend analysis and Moran's I statistic.Processed training dataset using kriging,compared different models and tested models in order to get the distribution map of biomass.Analyzing the biomass distribution with main forest types,age,altitude,slope and aspect these five factors,it shows:(1)In the study area,the area and biomass of coniferous and broad-leaved mixed forest is the largest.The second largest is coniferous mixed forest.The aboveground biomass of larch forest is the largest,which is 20.08Tg.The larger is white birch forest which is 17.09Tg and coniferous and broad-leaved mixed forest which is 15.92Tg.So choose white birch forest,larch forest and coniferous and broad-leaved mixed forest as the main forest types in the area.(2)The biomass of middle-aged forest land is the largest.The second largest is young forest.They are the main age classes in the study area.The biomass of white birch forest,larch forest biomass and coniferous and broad-leaved mixed forest increase with the age increased.(3)The average biomass at different altitudes is 5 class(950m~1390m),which is153.65t/hm~2,.The second largest is 3 class,which is 104.15t/hm~2.With the increase of altitude,white birch forest,larch forest forest and coniferous and broad-leaved mixed forest biomass gradually increase.(4)The main study area is gentle slope,followed by flat slope.The biomass of flat is the largest,which is 45.66Tg.The second largest is flat slope,which is 22.62Tg.The biomass of white birch forest,larch forest,coniferous and broad-leaved mixed forest increase with slope.(5)The biomass of white birch forest,larch forest and coniferous and broad-leaved mixed forest are highest in shady slope and half-shady slope,and smaller in sunny slope and half-sunny slope.With the sun radiation direction angle,the biomass increases decreases firstly and then increases.