【摘要】 为了给冀北山区山杨和白桦混交林的经营和管理提供相应的理论依据,选取河北省木兰围场国有林场管理局下辖的龙头山林场山杨和白桦混交林作为研究对象,运用标准地调查法、树木解析法,在样地随机伐取样木,将林木胸径、树高、材积等的连年生长量,以及平均生长量、生长率等作为评价标准,对冀北山区山杨和白桦混交林的生长差异进行比较分析。结果表明,山杨和白桦的混交林,树高变化在前期白桦大于山杨(其平均生长量和生长率分别高出0.05 m、1.3个百分点),中后期山杨大于白桦(分别高出0.05 m、0.14 m、1.3个百分点);胸径变化在前期山杨和白桦没有差别,但在中后期山杨大于白桦(平均和连年生长量差值分别为0～0.04 cm、0.01～0.21 cm);材积变化在前期山杨和白桦没有差别,但在中后期山杨大于白桦(平均和连年生长量差值分别为0～0.001 1 m~3、0～0.002 3 m~3)。更多还原

【Abstract】 In order to provide a theoretical basis for the management of the mixed forest of Populus davidiana and Betula platyphylla in the northern Hebei province, the mixed forest of Populus davidiana and Betula platyphylla in the Longshan Forest Farm under the Mulanweichang State-owned Forest Farm Administration of Hebei Province was selected as the research object. The sample-plot investigation method and tree analysis method were used on randomly selected sample trees to analyze the growth differences of the mixed forest of Populus davidiana and Betula platyphylla with indicators like the annual growth,average growth and growth rates of the DBH,tree height,and volume as the evaluation criteria.The results showed that in the mixed forest of Populus davidiana and Betula platyphylla,the height change of Betula platyphylla was larger than that of Populus davidiana in the early stage(the average height and growth rate were 0.05 mand 1.3 percent higher,respectively);while the height change of Populus davidiana was larger than that of Betula platyphylla in the middle and late stages(0.05 m,0.14 mand 1.3 percent higher,respectively).There was no difference in DBH between Populus davidianaand Betula platyphyllain the early stage,but Populus davidiana was larger than Betula platyphyllain the middle and late stage(the difference of average and annual growth was 0～0.04 cm and 0.01～0.21 cm,respectively).There was no difference in volume change between Populus davidiana and Betula platyphylla Suk.in the early stage,but Populus davidiana was larger than Betula platyphylla Suk.in the middle and late stage(the difference of average and annual growth was 0～0.001 1 m~3 and 0～0.002 3 m~3,respectively).更多还原