A simulation study on the interactive effects of radiation and plant density on growth of cut chrysanthemum
A simulation study on the interactive effects of radiation and plant density on growth of cut chrysanthemum
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DOI：
10.17660/actahortic.2002.593.19
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发表时间：
2002-11
期刊：
影响因子：
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通讯作者：
J. H. Lee;E. Heuvelink;H. Challa
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文献类型：
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作者：
J. H. Lee;E. Heuvelink;H. Challa
在本研究中，我们使用了光合作用驱动的作物生长模型，以确定可接受的种植密度，切花菊全年在不同强度的补充光。叶，茎，花之间的干物质分配模拟作物发育阶段的功能。叶面积指数模拟为叶干质量乘以比叶面积，后者是季节的函数。气候数据（每小时的全球辐射，温室温度和CO2浓度）和初始器官干重模型输入。根据时间和环境总辐射强度打开和关闭同化灯。将52个栽培（每周种植、参考植物密度以及长日照和短日照的长度）的具有补充光照（49 µmol m-2 s-1）的模拟植物新鲜质量用作参考植物新鲜质量。对于其他四种补充光强度（31、67、85和104 µmol m-2 s-1），用参考植物密度和每个种植周的长日照和短日照时间长度模拟干物质生产，并计算植物鲜重。然后将可接受的植物密度计算为植物新鲜质量与参考植物新鲜质量之间的比率乘以参考密度。在低自然光强度下，在增加补充光强度的情况下，植物密度可以显著增加（>30%），同时保持所需的植物质量。模拟光利用效率（g附加干重？MJ-1补充光）冬季（4.7）高于夏季（3.5），但补充光强度间差异不大。这种类型的模拟可以用于支持在不同强度的补充照明或照明策略下的植物密度的可接受水平以及最佳补充光强度的决策。
In the present study, we used a photosynthesis-driven crop growth model to determine acceptable plant densities for cut chrysanthemum throughout the year at different intensities of supplementary light. Dry matter partitioning between leaves, stems, and flowers was simulated as a function of crop developmental stage. Leaf area index was simulated as leaf dry mass multiplied by specific leaf area, the latter being a function of season. Climatic data (hourly global radiation, greenhouse temperature, and CO2 concentration) and initial organ dry mass were model inputs. Assimilation lights were switched on and off based on time and ambient global radiation intensity. Simulated plant fresh mass with supplementary light (49 µmol m-2 s-1) for 52 cultivations (weekly plantings, reference plant densities, and length of the long and short day period) was used as reference plant fresh mass. For four other supplementary light intensities (31, 67, 85, and 104 µmol m-2 s-1), dry matter production was simulated with the reference plant density and length of the long and short day period for each planting week and plant fresh mass was calculated. The acceptable plant density was then calculated as the ratio between plant fresh mass and reference plant fresh mass multiplied by the reference density. Under low natural light intensities, plant density could be increased substantially (>30%) at increased supplementary light intensities, while maintaining the desired plant mass. Simulated light use efficiency (g additional dry mass ? MJ-1 additional supplementary light) was higher in winter (4.7) than in summer (3.5), whereas it hardly differed between the supplementary light intensities. This type of simulations can be used to support decisions on the acceptable level of plant density at different intensities of supplementary lighting or lighting strategies and on optimum supplementary light intensities.