Cumulative Merchantable Stem Volume Equations for Poplar Plantations on Farmland in Sweden  

作　　者：Birger Hjelm 

机构地区：[1]Hjelm SilviConsult Company,Lapplandsresan 53,Uppsala 75755,Sweden

出　　处：《Journal of Agricultural Science and Technology(B)》2021年第1期15-25,共11页农业科学与技术（B）

摘　　要：To meet the need for effective management of poplar(Populus spp.)plantations in Sweden regarding different assortments,two equations were developed to estimate commercial stem volume for either any given top diameter or any stem fraction length.Data for fitting the equations came from 112 trees in 42 stands on farmland.Mean stand age,density and diameter at breast height(DBH)was 15.5 years,980 stems/ha,and 24.2 cm,respectively.Independent variables are for Eq.(1):DBH,total stem height(H)and given stem length fraction(h).For Eq.(2);DBH,H and given top diameter(d).Eq.(2)based on top diameter performed better than Eq.(1)based on stem length fraction with R2 of 0.994 and 0.991 respectively,and with Absolute Bias(AB)of 0.041 and 0.047(m3)respectively.The presented equations can be used to optimise the efficiency and profitability of poplar plantations when harvesting trees with larger diameters,for additional timber assortments other than bioenergy.

关 键 词：Short rotation forestry POPULUS forest management commercial tree volume models 

分 类 号：S71[农业科学—林学]