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| Modeling leaf color dynamics of winter wheat in relation to growth stages and nitrogen rates |
| ZHANG Yong-hui1, YANG Yu-bin2, CHEN Chun-lei1, ZHANG Kui-ting1, JIANG Hai-yan3, CAO Wei-xing4, ZHU Yan4 |
1 School of Computer Engineering, Weifang University, Weifang 261061, P.R.China
2 Texas A&M University System, AgriLife Research & Extension Center, Beaumont, TX 77713, United States
3 College of Information Science and Technology, Nanjing Agricultural University, Nanjing 210095, P.R.China
4 National Engineering and Technology Center of Information Agriculture, Nanjing Agricultural University, Nanjing 210095, P.R.China |
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摘要
本研究的目标是构建冬小麦叶片颜色动态模型，以模拟不同生育期和施氮水平下小麦不同叶位叶色变化。基于不同品种和施氮量下两个生长季的冬小麦试验，获取各主茎叶位叶片颜色的RGB（红、绿、蓝）数据。基于获取的RGB数据，构建了冬小麦叶片颜色动态模拟模型。结果表明，冬小麦叶片颜色变化经历了早期发育期（ES）、早熟期（MS）和早衰期（SS）三个不同的阶段，三个阶段的颜色特征分别为浅绿、深绿、黄色。在ES期，R和G颜色从初始值逐渐下降到稳定值，而B值基本保持不变。RGB值在MS阶段保持稳定，但在SS阶段三个值会逐渐增加到稳定值。采用不同的线性函数来模拟RGB值在时间和空间上的动态变化，在叶色模型中引入了品种参数（叶色矩阵MRGB）和氮素影响因子（FN）来量化它们各自的影响。利用独立的试验数据集对模型进行了检验，实测值与模拟值的均方根误差（RMSE）在7.0-10.0之间，相对RMSE（RRMSEs）在7%-9%之间。将叶色模型应用于冬小麦叶片的三维模拟，叶色可视化结果与叶色实际变化较为一致。此叶色模型可为作物在时空上生长发育的模拟提供坚实基础。
Abstract The objective of this work was to develop a model for simulating the leaf color dynamics of winter wheat in relation to crop growth stages and leaf positions under different nitrogen (N) rates. RGB (red, green and blue) data of each main stem leaf were collected throughout two crop growing seasons for two winter wheat cultivars under different N rates. A color model for simulating the leaf color dynamics of winter wheat was developed using the collected RGB values. The results indicated that leaf color changes went through three distinct stages, including early development stage (ES), early maturity stage (MS) and early senescence stage (SS), with respective color characteristics of light green, dark green and yellow for the three stages. In the ES stage, the R and G colors gradually decreased from their initial values to steady values, but the B value generally remained unchanged. RGB values remained steady in the MS, but all three gradually increased to steady values in the SS. Different linear functions were used to simulate the dynamics of RGB values in time and space. A cultivar parameter of leaf color matrix (MRGB) and a nitrogen impact factor (FN) were added to the color model to quantify their respective effects. The model was validated with an independent experimental dataset. RMSEs (root mean square errors) between the observed and simulated RGB values ranged between 7.0 and 10.0, and relative RMSEs (RRMSEs) ranged between 7 and 9%. In addition, the model was used to render wheat leaves in three-dimensional space (3D). The 3D visualizations of leaves were in good agreement with the observed leaf color dynamics in winter wheat. The developed color model could provide a solid foundation for simulating dynamic crop growth and development in space and time.
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Received: 20 April 2020
Accepted: 01 July 2021
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| Fund: The work was supported by the National Natural Science Foundation of China (31872847), the Higher Educational Science and Technology Program of Shandong Province, China (J18KA130), the Science and Technology Benefiting People Plan Project of Weifang High-Tech Zone, Shandong Province, China (2019KJHM13), and the Natural Science Foundation of Shandong Province, China (ZR2019PF023). |
| About author: Correspondence ZHU Yan, Tel: +86-25-84396598, Fax: +86-25-84396672, E-mail: yanzhu@njau.edu.cn, zhuyannjau@163.com |
Cite this article:
ZHANG Yong-hui, YANG Yu-bin, CHEN Chun-lei, ZHANG Kui-ting, JIANG Hai-yan, CAO Wei-xing, ZHU Yan.
2022.
Modeling leaf color dynamics of winter wheat in relation to growth stages and nitrogen rates . Journal of Integrative Agriculture, 21(1): 60-69.
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