Abstract: A model describing mutual feedback processes for structure and function of alfalfa was developed to determine the partition and accumulation of available alfalfa biomass under controlled structure and to provide support for improving production performance of alfalfa ecological functioning. The accumulated biomass of organs was calculated by summing biomass obtained in different growth periods. Dynamic structure and biomass of each organ during the growth processes was measured by controlled experiments for obtaining and calibrating model parameters. The model was evaluated by comparisons between measured data and simulated data. Results showed that the simulated change had a tendency for measurable accumulated biomass with each organ during growth cycles. The model developed in this study can quantity the processes of partitions and accumulations of available biomass at the organ level in controlled individual plants of alfalfa. Results will provide a measure to understand growth processes and yield predictions of alfalfa in different cutting patterns.

Key words: Photosynthesis, Biomass partitioning, Allometrical relationships, Functional-structural plant model

摘要： 以紫花苜蓿(Medicago sativa L.)各类器官归一化的生长扩展速率与相应的库强乘积作为权重,表征各器官竞争获取苜蓿个体在不同阶段产生的净光合同化产物的相对能力大小,描述不同生长阶段生物量在组成苜蓿个体的各器官中分配与累积的动态过程,从而构建定量化描述结构与功能互反馈过程的苜蓿生长过程数字化模型,为提高苜蓿生产性能与优化苜蓿生态功能提供理论支持。通过田间栽培控制试验,对苜蓿的形态结构与生物量进行动态测定,获取模拟参数;并进行控制结构下苜蓿各器官生物量测定值与模拟值的比较。结果表明:各器官生物量与几何特征测定值的变化趋势基本上与对应的模拟值变化趋势一致。因此,本研究给出的生物量分配模式能够应用于控制结构下苜蓿个体内可用生物量资源在各器官中分配与累积的定量描述。

关键词: 光合生产, 生物量分配, 异速生长关系, 功能-结构植物模型