摘要
依据生物力学的理论与方法,综合探讨了多种环境因子(光照、温度、土壤水分与养分等)外力作用下作物生长的动力学机制· 采用连续马尔柯夫过程方法建立了作物生长系统的动力学模型及数值模拟方法,研究了生长速率对外力条件变化的反应与生物量饱和值的变化,并以半干旱区作物为例进行了数值模拟计算与分析,为大田管理提供了定量依据· 该动力模型与其它植物生长模型相比,其优越性在于从宏观和微观相结合上反映了资源利用的多维性,揭示了资源转化过程· 所建作物生长系统模拟方法,具有先进性和可操作性。
According to the biomechanic theory and method,the dynamic mechanism of crop growth under the external force action of multi_environment factors(light,temperature,soil and nutrients etc.)was comprehensively explored.Continuous_time Markov(CTM) approach was adopted to build the dynamic model of the crop growth system and the simulated numerical method.The growth rate responses to the variation of the external force and the change of biomass saturation value were studied.The crop grew in the semiarid area was taken as an example to carry out the numerical simulation analysis,therefore the results provide the quantity basis for the field management.Comparing the dynamic model with the other plant growth model,the superiority of the former is that it displays multi_dimension of resource utilization by means of combining macroscopic with microcosmic and reveals the process of resource transition.The simulation method of crop growth system is advanced and manipulated.A real simulation result is well identical with field observational results.
出处
《应用数学和力学》
CSCD
北大核心
2003年第6期644-652,共9页
Applied Mathematics and Mechanics
基金
国家重点基础研究发展规划项目(G2000018603
2002CAC00300)
国家自然科学基金资助项目(39970135
30070139)
关键词
环境外力
作物生长
动力学模型
数值模拟
external force of environment
crop growth
dynamic model
numerical simulation
