基于光合产物动态分配的玉米生物量模拟

Maize biomass simulation based on dynamic photosynthate allocation

光合产物分配是作物生长发育及生物量形成的关键环节,也是作物生长模拟的重要内容.本研究依据光合产物分配机理,结合玉米不同生长阶段的光合产物分配特点,构建了玉米光合产物分配模型.与WOFOST模型的CO_2同化模块相结合,实现了对玉米各器官生物量动态的逐日模拟.利用锦州农田生态系统野外观测站5年的春玉米大田试验资料对模拟效果进行了验证.结果表明:模型能解释总生物量变化的95.4%;对营养器官生物量变化的解释率达87.0%;对叶、根、茎生物量变化的解释率分别达85.3%,67.9%和76.5%;对穗生物量变化的解释率达87.5%.模型可实现玉米各器官的生物量动态的准确模拟.

Photosynthate allocation is critical to crop growth and biomass formation, and it is also a key part of crop simulation. A photosynthate allocation model of maize was established based on photosynthate allocation mechanisms as well as the photosynthate allocation characteristics of maize at different stages. This model was then coupled with the CO2 assimilation module of WOFOST crop model to simulate the biomass dynamics of different organs of maize on daily scale. It was validated by 5 years＇ field experiment data of spring maize from Jinzhou Agricultural Ecosystem Research Sta- tion. The results showed that, the model could explain about 95.4% of maize＇ s total biomass change, while 87.0%, 85.3%, 67.9%, 76.5% and 87.5% of vegetative, leaf, root, stem, and ear biomass variations, respectively. This model could fulfill accurate simulation of different organ bio- mass dynamics of maize.