林分或同树种单株母树的结实量决定于树种的系统发育特性和变化着的环境条件。因此,结实强度是一个变量,对这种变量的研究具有理论和实际意义。 为了测量树木结实的相对值,己提出目测等级和根据计数一米长树枝结果数进行估计的比较客观的标准。 目测有一缺点,不同观测者或一个观测者在不同年份估计产量时,结果常不一样,或者说,目测估计带有很大的主观性。另外,计数一米长树枝结果数时,必需剪取树 Stands or the same tree species of the parent plant tree seed set depends on the species of phylogenetic characteristics and changing environmental conditions. Therefore, strength is a variable strength, the study of this variable has theoretical and practical significance. In order to measure the relative value of trees, objective criteria of visual grade and estimates based on counting the number of branches of a meter long have been proposed. Visual inspection has one shortcoming. When different observers or observers estimate yields in different years, the results are often different, or the visual estimation is largely subjective. In addition, when counting the number of branches of a meter in length, the tree must be cut