Biomass And ElementDistribution And Accumulation Pattern Dynamic Of Plantations Of Shanxi Province On Loess Plateau

In this paper,Shanxi province Jixian county Beijing Forestry University experimental base in Hongqi forest farm of Robinia pseudoacacia plantation and Pinus tabulaeformis plantation as the research object.It is based on the data of each wood ruler,trunk analysis,soil physical properties and chemical analysis of elements,The biomass of artificial locust forest and artificial pine forest land were analyzed,and the distribution characteristics of biomass are discussed.The accumulation and distribution characteristics of elements in artificial locust forest and artificial oil forest land were revealed.Compared with 2012 data,the biomass and element dynamics in 2012-2016 years and four years were studied.Specific analysis and discussion results are as follows:(l)In 2012,the total biomass of artificial Robinia pseudoacacia forest land was 65.047t/hm2,and the different levels of ecosystem were sorted into tree layer>herb layer>shrub layer>litter layer according to the biomass.The different organs of the tree layer are sorted according to the size of the biomass into the tree trunk>root>bark>Branch>leaf>fruit.The total biomass of the artificial Pinus tabulaeformis forest land was 66.001t/hm2,and the different levels of the ecosystem were sorted into tree layer,shrub layer,litter layer and herb layer according to the biomass.The different organs of the tree layer are sorted according to the size of the biomass into the trunk,roots,branches,bark,leaves and fruits.In 2016,the total biomass of artificial Robinia pseudoacacia plantation was 80.833t/hm2,and the distribution of biomass at different levels of the ecosystem was Tree Layer>herb layer>litter layer>shrub layer.The distribution of biomass in different organs of the tree layer is the trunk>root>bark>Branch>leaf>fruit.The total biomass of artificial Pinus tabulaeformis forest land was 80.633hm2,and the distribution of biomass in dinerent layers of artificial Pinus tabulaeformis forest ecosystem was Arbor Layer>herb layer>litter layer>shrub layer.The distribution of biomass in different organs of tree layer is trunk>Branch>leaf>root>bark>fruit(2)In 2012,the total accumulation amount of elements N,P,K,Ca,Na,Mg,Fe,Mn,Cu,Zn,and B of artificial Robinia pseudoacacia plantation was 1841.850kg/hm2,the total accumulation of large amounts of elements N,P,K,Ca,Na and Mg was 1786.g15kg/hm2,and the total accumulation of trace elements Fe,Mn,Cu,Zn,and B was 54934.785g/hm2.The accumulation of elements in different levels of artificial Robinia pseudoacacia forest ecosystem was classified as tree layer>herb layer>shrub layer.The total accumulation of elements N,P,K,Ca,Na,Mg,Fe,Mn,Cu,Zn,and B in artificial Pinus tabulaeformis forest land was 629.248kg/hm2,the total accumulation of large amounts of elements N,P,K,Ca,Na and Mg was 592.872kg/hm2,and the total accumulation of trace elements Fe,Mn,Cu,Zn,and B was 36376.095g/hm2.The accumulation of elements in different layers of the artificial Pinus tabulaeformis forest ecosystem was classified as the tree layer>herb layer>shrub layer.In 2016,the total amount of the accumulation of a large number of elements N,P,K,Ca,Na and Mg in artificial Robinia pseudoacacia plantation was 3968.780kg/hm2,and the arrangement order was Arbor Layer>herb layer>shrub layer.The total accumulation of trace elements Fe,Mn,Cu,Zn,and B of 64064.427g/hm2,the order of tree layer>herb layer>shrub layer;a large number of elements N,P,K,Ca,Na and Mg of artificial Pinus tabulaeformis forest land total accumulation amount is 1964.191kg/hm2,the order of the tree layer>herb layer>shrub layer.The total accumulation amount of trace elements Fe,Mn,Cu,Zn,and B was 13551 1.760g/hm2,and the arrangement order was the tree layer>herb layer>shrub layer.(3)Compared with the 2012 data,the total biomass of Robinia pseudoacacia forest four years increased 24.24%,different levels of the ecological system,the tree layer biomass increased by 13.70%,18.17%growth in total forest biomass of Pinus tabulaeformis in four years,the growth rate is more obvious.The biomass of arbor layer increased by 17.85%in different levels of ecosystem.