Abstract Biomass partitioning is a pivotal part of the function-structure feedback mechanism. To improve the simulation of aboveground biomass partitioning in growth models for rapeseed (Brassica napus L.), we developed an aboveground biomass partitioning coefficient model for main stem and primary branches, and the stems, leaves, and pods on them, by quantifying the relationships between the biomass partitioning coefficient of major organs aboveground and physiological day of development (DPD). To realize this goal, dry matter data of organs were derived from an outdoor experiment with rapeseed cultivars Ningyou18 and Ningza19 under different fertilizer and transplanting density treatments in the 2012–2015 growing seasons. The model was fitted by calculating the partitioning coefficients of different organs as the ratio of the biomass of organs and their superior organs and normalizing DPD into the [0, 1] interval. Various model variables were parameterized to explain the effects of cultivar and environmental conditions on biomass partitioning coefficients for different organs. Our descriptive models were validated with independent experimental data, the correlation (r) of simulation and observation values all had significant level at P

中文翻译：

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油菜（Brassica napus L.）地上生物量分配系数模型

摘要 生物质分配是功能-结构反馈机制的关键部分。为了改进油菜 (Brassica napus L.) 生长模型中地上生物量分配的模拟，我们通过量化关系，开发了主茎和主枝以及茎、叶和豆荚的地上生物量分配系数模型地上主要器官的生物量分配系数与生理发育日（DPD）之间的关系。为实现这一目标，器官干物质数据来源于油菜品种宁优18和宁杂19在2012-2015生长季不同施肥和移栽密度处理下的室外试验。该模型通过计算不同器官的分配系数为器官与其上级器官的生物量之比，并将DPD归一化为[0, 1]区间。各种模型变量被参数化以解释栽培品种和环境条件对不同器官生物量分配系数的影响。我们的描述性模型用独立的实验数据进行了验证，模拟值和观测值的相关性 (r) 在 P 处均具有显着水平