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基于植株拓扑结构的生物量分配的玉米虚拟模型 被引量:50

Virtual maize model I. biomass partitioning based on plant topological structure
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摘要 依据植物结构 -功能相互作用机理 ,建立了能模拟玉米生长发育与形态结构建成的虚拟模型。该模型的重要部分为基于植株拓扑结构的生物量分配模块。叙述了该模块的构建原理 ,以 2 0 0 0年田间试验数据提取了玉米的发育、生物量生产和生物量分配参数。模型模拟了 2 0 0 1年的玉米生长发育与生物量分配过程 ,模拟结果与田间试验结果比较吻合。应用该模型模拟了 2 0 0 Although there have been many models of maize growth, most of them have over simplified the description of plant architecture. Not only is plant architecture a major attribute influencing maize eco physiology function, it is also the interface between maize growth and environmental conditions. In order that maize growth and development be more accurately simulated, we present a maize model based on a feedback mechanism between plant architecture and physiological function. Here, we emphasize the method of biomass partitioning on the basis of plant topological structure. Because maize is composed of metamers, and metamers comprise internodes, nodes and some affiliated organs (e.g. leaves), maize growth can be viewed as a process of the metamers' emergence and development. The time interval of emergence between two neighboring metamers is defined as the growth cycle (GC), and the metamer and growth cycles are the architectural and temporal scale for the model, respectively. The model predicts maize development based on a linear relationship between the increase of metamer numbers and the change of accumulative temperature. The model also estimates plant biomass yield on the basis of a linear relationship between the increase of net assimilate in aboveground part and the change of accumulative transpiration of the maize plant. For realizing the rational partition of newly produced biomass into individual organs of the plant, the model used sink strength P o (o denoting blade, sheath, internode, ear and tassel) to express the matter acquisition ability of different type of organs. The model used an expansion rate function to express the variation of growth velocity for different type of organs. And, with the current matter demand of individual organs defined as the sink strength multiplied by the expansion rate, the biomass partitioning pattern was based on plant topological structure. During the field experiment of maize growth conducted in 2000 and 2001, the fresh weight and geometric morphology of individ
出处 《生态学报》 CAS CSCD 北大核心 2003年第11期2333-2341,共9页 Acta Ecologica Sinica
基金 国家自然科学基金资助项目 ( 3 9970 42 8) 国家重点基础研究发展规划资助项目 ( G1 9990 1 1 70 9) 高等学校博士学科点专项科研基金资助项目 ( 1 9990 0 1 0 0 9)~~
关键词 玉米 模型 生物量分配 形态结构 虚拟植物 maize model biomass partitioning architecture virtual plant
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