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本文根据农林复合系统中林分（以林带为主体）的特殊性，结合树木生长发育和林带结构变化规律，将农林复合系统中林分生长发育划分为幼龄期、中龄期（速生期）和防护成熟期。并采用林分径级离散度、防护成熟龄、更新龄等量化指标将３个生长发育时期定量化；对于东北地区农田林网中杂交杨、乡土杨的幼龄期为０～５、０～８，速生期６～１５、９～２４，实际防护成熟期１６～３３、２５～３６，防护成熟期１６～自然成熟龄、２５～自然成熟龄。同时给出各生长发育时期相应的经营措施。为农林复合系统中林木经营提供可靠的依据。
According to the particularity of stands (mainly belts) in the agroforestry system, this paper divided the stand growth and development of the agroforestry system into three stages: young stage, middle stage (fast-growing stage) And protective maturity. The three growth stages were quantitatively quantified using the quantitative index of stand diameter-class dispersion, protective maturity and renewal age. For young poplar and native poplar in farmland in northeastern China, the young age was 0 ~ 5,0 ~ 8, fast-growing period 6 ~ 15,9 ~ 24, the actual protective maturity 16 ~ 33,25 ~ 36, protective maturity 16 ~ natural maturity, 25 ~ natural maturity. At the same time each growth and development period corresponding management measures. For the agroforestry system to provide a reliable basis for forest management.