甘薯生长发育模拟模型的初步研究Ⅰ.光合作用和干物质生产与分配

A preliminary study on sweet potato growth and development model Ⅰ. photosynthesis and dry-matter partitioning

光合作用和干物质的生产与分配模型是作物生长模拟模型中最基础的部分 ,在试验的基础上以徐薯 18为例建立模型。光合作用模型以门司 -佐伯的模型为基本蓝图 ,增加了温度因子对光合强度影响的研究。干物质分配模型打破了传统的采用分配系数的方法 ,引入潜在生长和实际生长的概念 ,根据不同的时期、不同的优先等级分配光合产物 ,使光合产物的分配也建立在一个动态的过程之中。模型验证结果表明 ,块根和拐子的模拟精度较高 ,茎、叶片、叶柄次之 。

Photosynthesis and dry-matter partitioning are main procedures in crop growth and development models. In this paper,a model is presented based on experiment of sweet potato variety Xushu 18. Photosynthesis was calculated based on Monsi-Saeki formula, and temperature was taken into account. Dry-matter partitioning was determined according to potential growth and actual growth of plant organs instead of the conventional distribution coefficient method. Photosynthesis production was distributed in term of priority order and the dry-matter partitioning was in a dynamic process. The model test showed that the precision of tuber and underground stem's simulation was the highest, followed by leaf, petiole and stem, and root's was the lowest.