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一类阻滞增长的生灭过程模型 被引量:1

A type of birth and death process model for blocked growth
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摘要 应用生灭过程理论,考虑环境容纳量对种群增长的阻滞作用,引入带阻滞的增长率和常数的死亡率,建立具有阻滞增长的生灭过程模型.通过求解所构建的一阶矩及二阶矩的方程,计算出种群数量的期望和方差.计算机模拟结果表明种群数量不会无限增长,这也符合生态实际,进一步说明模型构建的合理性.最后得到的结果是对生灭过程理论的有益扩展. In this paper,considering the retardation effect of environmental capacity on popu-lation growth,a birth and death process model with block growth rate and constant mortality rate is established.The expectation and variance of population quantity are calculated by solving the equation ofˉrst order moment and second moment.The results of computer simulation show that the population quantity will not increase indefinitely,which also conforms to ecological reality and further explains the rationality of model construction.The result is the beneficial extension of the theory of the birth and death process.
作者 杨鹏 刘华 魏玉梅 马明 石磊 冶建华 YANG Peng;LIU Hua;WEI Yu-mei;MA Ming;SHI Lei;YE Jian-hua(School of Mathematics and Computer Science.Northwest Minzu University,Lanzhou 730030,China;Experimental Center,Northwest Minzu University,Lanzhou 730030,China)
出处 《高校应用数学学报(A辑)》 CSCD 北大核心 2018年第4期414-421,共8页 Applied Mathematics A Journal of Chinese Universities(Ser.A)
基金 国家自然科学基金(31560127 31260098) 西北民族大学中央高校基本科研业务费资金(31920180116 31920170072 31920180044) 西北民族大学"双一流"和特色发展引导专项资金 西北民族大学中央高校基本科研业务费专项资金资助研究生项目(Yxm2018117) 甘肃省科技计划(1610RJZA102) 国家民委中青年英才计划((2014)121号)
关键词 随机过程 生灭过程 数学模型 期望 方差 stochastic process process of birth and death mathematical model expectation variance
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