【作者】 毕永华；

【导师】 董希斌； 肖生灵；

【作者基本信息】 东北林业大学 ， 森林工程， 2001， 硕士

【摘要】 林分各因子生长受到间伐强度、间伐方式、林分结构、立地条件、林龄、气候等多因素的影响，其生长过程是随机变化的，生长模型因多条件的约束有所不同。 本文结合外业调查、计算机数据处理和理论分析的方法，对大兴安岭兴安落叶松人工林和天然林在不同间伐强度作业后，林分因子的生长进行了系统的分析。分析结果得出间伐强度对兴安落叶松林分胸径、单株材积的生长有显著的影响。间伐强度能够促进林分树高生长，但变化不大。间伐后，林分蓄积生长量有所增加，随着间伐强度增大到一定程度后，林分总蓄积量有所降低。在此基础上，本文用统计理论和灰色系统理论，建立了兴安落叶松林分生长因子的生长最佳模型和各因子间的相互关系式，并进行对比分析。灰色理论用来预测兴安落叶松林分因子的生长是可行的，但对各因子间的变化规律的预测仍需进一步的研究。更多还原

【Abstract】 Forest stand growth is impacted by thinning intensity, thinning methods, stand structure, terrain conditions, timber ages and climates in forest areas. The stand growth process is random changed and the growth models is different under different factors. By investigating the growth changes of larch gernilinii plantation and natural forests stands after thinning with different intensity in Daxing抋n mountain areas, the growth laws of stand elements are systematically analyzed by using the theoretical ways on the computer. The results show that thinning intensity has remarkable impacts on the growth of diameter breast-high and timber volume and few influences on the growth of timber height. With the increase of thinning intensity, the stand total volumes have a little decrease. On the basis of these, using the statistical method and grey system theory, the growth models of stand elements and the relation functions between the elements are given. The grey theory is feasible to calculate the growth quantity of stand elements and the theory will be studied to fit the relations cf stand elements further.更多还原