【摘要】 林分结构在很大程度上决定了林分稳定性和更新苗的存活与分布,因此,研究林分结构与更新格局至关重要。本文运用角尺度、大小比数、趋势面分析对不同林龄落叶松人工林结构及更新苗分布格局进行了统计分析。结果表明:27 a生落叶松林为随机分布,32 a和39 a生落叶松林均呈均匀分布;更新苗在不同林龄落叶松林下均呈聚集分布,且与林龄呈负相关关系。不同林龄林分结构随着林龄的增加林木分化呈递减的趋势,随着林龄增加林木在空间结构上的分化趋于稳定;不同林龄更新苗在空间结构上呈现出随着林龄的增加更新苗分化不明显;草本植物对更新苗的数量和分布影响最大,在人工林经营过程中应结合抚育间伐并对林下灌草及枯落物进行及时清理,促进更新苗生长发育。更多还原

【Abstract】 Stand structure largely determines the stability of forest and the survival of seedlings and their distribution pattern, therefore it is important to research stand structure and regeneration pattern. The stand structure and seedling distribution pattern of different Larix principis-rupprechtii plantations were studied using the methods of uniform angel index, neighborhood and trend surface analysis. The results showed that the tree individuals were randomly distributed in a 27-year-old Larix principis-rupprechtii plantation, while uniform distribution was found in 32-year-old and 39-year-old Larix principis-rupprechtii plantations respectively. Seedlings individuals were clumply distributed in all plantations with different stand years and the degree of aggregation was negatively correlated with stand age.The individual’s differentiation showed a decreasing trend with increasing stand age. The variation of spatial structure decreased with increasing stand age and tended to be relatively stable in old-growth plantations. The individual’s differentiation of seedling was not obvious in spatial structure with increasing stand age. The grass cover is the major determinent of the number and distribution of seedlings.The management practices, including thinning, grass and litter removal, should be conduct to promote natural regeneration in Larix principis-rupprechtii Plantation.更多还原