Department of Plant Sciences, University of California Davis, Davis, CA 95616, USA.
Ann Bot. 2011 Oct;108(6):1135-45. doi: 10.1093/aob/mcr072. Epub 2011 May 5.
Many physiological processes such as photosynthesis, respiration and transpiration can be strongly influenced by the diurnal patterns of within-tree water potential. Despite numerous experiments showing the effect of water potential on fruit-tree development and growth, there are very few models combining carbohydrate allocation with water transport. The aim of this work was to include a xylem circuit into the functional-structural L-PEACH model.
The xylem modelling was based on an electrical circuit analogy and the Hagen-Poisseuille law for hydraulic conductance. Sub-models for leaf transpiration, soil water potential and the soil-plant interface were also incorporated to provide the driving force and pathway for water flow. The model was assessed by comparing model outputs to field measurements and published knowledge.
The model was able to simulate both the water uptake over a season and the effect of different irrigation treatments on tree development, growth and fruit yield.
This work opens the way to a new field of modelling where complex interactions between water transport, carbohydrate allocation and physiological functions can be simulated at the organ level and describe functioning and behaviour at the tree scale.
许多生理过程，如光合作用、呼吸作用和蒸腾作用，都会受到树木内水势的日变化的强烈影响。尽管有许多实验表明水势对果树发育和生长的影响，但很少有模型将碳水化合物分配与水分运输结合起来。本工作的目的是将木质部电路纳入功能结构 L-PEACH 模型。
木质部建模基于电电路模拟和水力传导的哈根-泊肃叶定律。还纳入了叶片蒸腾、土壤水势和土壤-植物界面的子模型，为水流提供驱动力和途径。通过将模型输出与田间测量和已发表的知识进行比较来评估模型。
该模型能够模拟一个季节内的水分吸收以及不同灌溉处理对树木发育、生长和果实产量的影响。
这项工作开辟了一个新的建模领域，在这个领域中，可以在器官水平上模拟水运输、碳水化合物分配和生理功能之间的复杂相互作用，并描述树木尺度上的功能和行为。
