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首页> 外文会议>2016 IEEE International Conference on Functional-Structural Plant Growth Modeling, Simulation, Visualization and Applications >Modelling temporal variation of parameters used in two photosynthesis models: Influence of fruit load and girdling in fruit bearing branches of apple trees
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Modelling temporal variation of parameters used in two photosynthesis models: Influence of fruit load and girdling in fruit bearing branches of apple trees

机译：对两个光合作用模型中使用的参数的时间变化进行建模：苹果树上有果实的树枝中的果实负载和环剥的影响

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A large number of studies have found seasonal and temporal variability in leaf photosynthesis parameters in different crops. This variability depends upon the environment, the developmental stage of the plant and the presence or absence of sinks. Girdling removes the bark and phloem down to the youngest xylem all around the stem and prevents export of photoassimilates out of the stem. This technique is used to manipulate tree development and growth, as well as fruit growth, in a variety of fruit species. It has been shown to decrease net photosynthesis rate (Pn) in several tree species. Developing fruits and crop load have often been reported to influence individual leaf photosynthesis rate in tree crops. In the literature, numerous studies propose models to simulate photosynthesis. In this “preliminary” study, we have chosen to compare three models: The rectangular and non-rectangular hyperbola model by Thornley, as well as the model by Marshall and Biscoe. Ten-year old apple trees (Malus domestica L. (Borkh.), cv. `Elstar') were used to study and model the seasonal variation of photosynthetic parameters in leaves of long shoots and rosettes, as a function of global fruit load (at the branch level), with or without girdling, during the growing season of 2015. Three 6-years-old fruit bearing branches were selected in each tree and treated independently. Gas exchange measurements were carried out using a LI-6400XT portable photosynthesis system. For each fruit bearing branch, light response curves of Pn for 2 leaves of a rosette were measured at two different positions, proximal and distal. Our comparison of models indicates that the model of Marshall and Biscoe is the most accurate model for the simulation of photosynthesis rate in bearing branches of apple tree with time (season) and the three treatments applied.
机译：大量研究发现，不同作物的叶片光合作用参数具有季节性和时间变异性。这种可变性取决于环境，植物的发育阶段以及水槽的存在与否。环剥将树皮和韧皮部去除到茎周围的最小木质部，并防止光同化物从茎中输出。该技术用于控制各种水果种类中的树木发育和生长以及果实生长。它已经显示出可以降低几种树种的净光合作用率（Pn）。经常有发展中的果实和农作物负荷被报告来影响树木作物中单个叶片的光合作用速率。在文献中，许多研究提出了模拟光合作用的模型。在此“初步”研究中，我们选择比较三种模型：Thornley的矩形和非矩形双曲线模型，以及Marshall和Biscoe的模型。十岁的苹果树（Malus domestica L.（Borkh。），cv.`Elstar'）用于研究和建模长枝和玫瑰花结叶片中光合作用参数随全球果实载量的变化（在2015年的生长季节中，无论有无环带，都可以选择。在每棵树中选择了三个6岁的有果实的树枝，并对其进行了独立处理。使用LI-6400XT便携式光合作用系统进行气体交换测量。对于每个结实果实的分支，在两个不同的位置（近端和远端）测量玫瑰花结2片叶子的Pn光响应曲线。我们对模型的比较表明，Marshall和Biscoe模型是最准确的模型，用于模拟苹果树的分枝随时间（季节）和三种处理方式的光合作用速率。

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