Study On Typical Shrub Biomass Model Of Soil And Water Conservation Forest In Central Shanxi Province

Understory vegetation is an indispensable and important part of the forest ecosystem.In the circulation of nutrient elements in the forest ecosystem,accumulation and improvement of the forest environment,maintenance of the diversity of the ecosystem,stability of the ecosystem function and forest succession Etc.have a very important role.In the process of forest stand succession,soil nutrients affect the growth of aboveground species,and aboveground parts improve soil physical and chemical properties,forming a relatively stable ecosystem within the forest stand.In this paper,the typical shrub grass in the soil and water conservation forest in central Shanxi(Linfen,Changzhi,Jinzhong,Lüliang)is taken as the research object,In the five different forest types,the biomass of understory vegetation is studied in different Forest type allocation performance,mathematical modeling method to fit the optimal model of typical shrub biomass.Research indicates:(1)Research on the distribution of vegetation biomass under different forest stands shows that the pure forest of Pinus tabulaeformis,the pure forest of Quercus liaotungensis,the mixed forest of Pinus tabulaeformis and Quercus liaotungensis,the pure forest of Platycladus orientalis and the mixed forest of Platycladus orientalis and Pinus bungeana.The biomass of the shrub layer is as follows: the mixed forest of Pinus sylvestris and Platycladus orientalis is low,and the pure forest of Pinus tabulaeformis is the highest;the biomass of the herb layer is as follows: the mixed forest of Pinus tabulaeformis and Platycladus orientalis is low,and the pure forest of Platycladus orientalis is the highest;It is: the mixed forest of Pinus sylvestris and Platycladus orientalis is low,and the pure forest of Platycladus orientalis is the highest;the mixed forest of Pinus tabulaeformis and Quercus liaotungensis has higher forest biomass,and the proportion of shrub and herb biomass is balanced,and the understory vegetation is stable.Therefore,Pinus tabulaeformis-Quercus liaotungensis mixed forest can be used as a reasonablemixed model of local soil and water conservation forest,which is more conducive to biomass accumulation of soil and water conservation forest in central Shanxi.(2)Five kinds of shrubs were selected to fit the biomass model and compatibility model of a single plant,and the model was tested.Tiger hazelnut total biomass and plant height fitting model is optimal,the model is W = 0.54H1.29;Spiraea trilobata total biomass and ground diameter fitting model is optimal,model is W = 125.00 D + 130.50;The square of plant biomass and plant diameter multiplied by plant height is the best model,the model is W = 151.36e0.005 * D2H;the model of clove total biomass and plant diameter is the best,the model is W = 291.97 ln D + 276.55.(The applicable scope of the shrub biomass model is the soil and water conservation forest stands in the central Shanxi area)Two-level allocation is adopted for the compatibility model of a single plant.Based on the underground biomass equation,the compatibility of the total volume and each component model is improved.The fitting results of the dimensional models of Tiger Hazelnut and Spiraea trilobata are relatively optimal,while the fitting results of the dimensional models of Syzygium aromaticum are relatively poor.The accuracy of the stem biomass model of Spiraea trilobata and Syzygium aromaticum has been improved to varying degrees...