【摘要】 运用最优梯度搜索参数估值的非线性回归方法,建立了森林群落冠层郁闭度与缺苞箭竹（Fargesia denndata）天然更新苗丛数（每4m²）的正态函数关系 y=ae^-b（x-c）2.结果表明:在不同的森林群落之间,箭竹天然更新的适宜性存在很大差异;同一群落内箭竹天然更新主要受冠层郁闭度和层片结构的影响.更多还原

【Abstract】 With the study area of sub-alpine forest region in the Northwest Sichuan,the distribution and natural regeneration of Fargesia danudata-a short bamboo,which is the main food of Giant Panda are discussed. The synusia theory is used to analyse the structure of the communities comprised the bamboo,which make the distribution and regeneration pattern of the bamboo in a certain community clear. Non-linear regression equations of canopy coverage (x) and bamboo patches(y) show that the regeneration suitability of the bamboo is quite different among five types of community,and in a certain community it is mainly determained by canopy coverage.更多还原