论文部分内容阅读
分析了内蒙古大兴安岭林分结构对兴安落叶松林更新的影响。结果表明:1)年龄56~65 a草类-落叶松林平均更新密度达1 363株/hm2,较54~63 a杜香-落叶松林和36~48 a草类-落叶松林分别高12.8%,36.5%。2)年龄36~65 a,密度315~3 263株/hm2范围内的草类-落叶松和年龄54~63 a密度865~2 241株/hm2范围内的杜香-落叶松林,在其它条件相近情况下,随着林分年龄和密度增加,林分更新呈增加趋势;随着枯倒木数量和其腐烂程度的增加,更新密度增加;随着林下草本和灌木盖度增加,更新密度呈下降趋势。3)不同水平格局的林分更新不同,当聚集分布、随机分布和均匀分布时,平均更新密度分别为1 415株/hm2,1 165株/hm2,118株/hm2。
The influence of the forest stand of Daxing’an Mountains in Inner Mongolia on the regeneration of Larix gmelinii forest was analyzed. The results showed that: 1) The average regeneration density of grass-larch plantations aged from 56 to 65 years was 1 363 plants / hm2, which was 12.8% higher than that of the ducks-larch forest and 36-48 a grass- 36.5%. 2) Grass-larch in the range of 36-65 years of age, 315-3323 plants / hm2 in density and 865-224 plants / hm2 in the range of 54-63 years of age, under the other conditions In similar circumstances, with the increase of the age and density of forest stand, the regeneration of the stands showed an increasing trend. With the increase of the number of rotted wood and its decay, the updated density increased. With the increase of understory herbs and shrubs, the updated density was Downtrend. (3) The average update densities were 1 415 plants / hm2, 1 165 plants / hm2, 118 plants / hm2, respectively, when the distributions were varied, randomly distributed and evenly distributed.