摘要
对加杨苗期密度试验研究表明，干、枝、根的干重（ＷｓｂＲ），干、枝的干重（Ｗｓｂ）与密度间的动态关系，和全重与密度的关系相似，都存在着合理密度、合理密度范围。其上限合理密度线在双对数图上亦为Ｓ型曲线，但其合理密度直线式的斜率则不同。利用上下限合理密度线、合理密度系数，导出了适于种群密度调控的Ｒ一Ｄ模式。然后用加杨、欧美杨杂种、毛白杨等杨树人工林数据，对合理密度线进行了验证。编制了合理密度调控图表。
The results of density tests with Populus canadensis seedlings showed that the rela-tionships between the dry weight of stem, branch and root(Wsbr)and density, between the dry·weight of stem and branch(Wsb)and density were similar to that between the whole weightand density. Reasonable density and range of reasonable density were existed. Their upperreasonable density lines on the chart of double logarithm were also found as'S'shape. How-ever, their slopes were different.R一D model which is suitable for density control of popula-tion, was established with upper and lower reasonable density lines,and the coefficient of rea-sonable density. Thereafter, the model was tested with the data of various poplar plantations.And, reasonable density table and chart was compiled.
基金
国家自然科学基金
关键词
杨树
苗期
密度
reasonable density
partial weight
line of reasonable density
coefficient of rea-sonable density
R一D model
