The optimal control problem of linear population dynamic system with age-structure in periodic environment was investigated.
在周期环境下，研究一类具有年龄结构种群线性动力系统的最优控制问题。
Total arable land dynamic balance equation stipulates the control subject for the regional arable land system un-der the base of predictable technology and population pressure.
在可预知的技术进步和人口压力背景下，耕地总量动态平衡方程为区域耕地系统的状态规定了调控目标；
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