湖北农业科学 ›› 2026, Vol. 65 ›› Issue (7): 208-214.doi: 10.14088/j.cnki.issn0439-8114.2026.07.032

• 农业工程 • 上一篇    下一篇

基于改进粒子群优化的多生育期烟草LAI估测

邓哲红1, 王薇2, 邓时锋1, 崔国贤2, 佘玮2, 王帅斌3, 王东3, 曹晓兰1   

  1. 1.湖南农业大学信息与智能科学技术学院,长沙 410128;
    2.湖南农业大学农学院,长沙 410128;
    3.湖南中烟工业有限责任公司技术中心,长沙 410014
  • 收稿日期:2026-04-27 出版日期:2026-07-25 发布日期:2026-07-23
  • 通讯作者: 曹晓兰(1972-),女,湖南常德人,副教授,博士,主要从事大数据与知识工程与农业信息工程研究工作,(电子信箱)cxl@hunau.net。
  • 作者简介:邓哲红(2000-),男,湖南岳阳人,在读硕士研究生,研究方向为农业信息化,(电子信箱)wangdayan1@163.com。
  • 基金资助:
    国家现代农业产业技术体系项目(CARS-16-E11); 湖南省教育厅重点项目(23A0178); 湖南中烟工业有限责任公司科研开发项目(KY2024YC0015); 湖南中烟工业有限责任公司科研计划项目(KY2023YC0008)

Estimation of tobacco LAI across multiple growth stages based on improved particle swarm optimization

DENG Zhe-hong1, WANG Wei2, DENG Shi-feng1, CUI Guo-xian2, SHE Wei2, WANG Shuai-bin3, WANG Dong3, CAO Xiao-lan1   

  1. 1. College of Information and Intelligence, Hunan Agricultural University, Changsha 410128, China;
    2. College of Agronomy, Hunan Agricultural University, Changsha 410128, China;
    3. Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha 410014, China
  • Received:2026-04-27 Published:2026-07-25 Online:2026-07-23

摘要: 为解决烟草叶面积指数(LAI)传统测量效率低、遥感反演特征冗余及模型参数优化易陷入局部最优等问题,构建了适用于不同生育期的烟草LAI估测模型。以烟草团棵期和旺长期为研究对象,基于无人机多光谱影像提取25个遥感变量,并采用竞争自适应重加权采样算法(CARS)、最小角回归算法(LARS)和迭代保留信息变量算法(IRIV)进行特征筛选。结果显示,IRIV算法综合表现较优,可有效降低预测误差;基于优选特征构建随机森林(RF)、XGBoost、BP神经网络和支持向量回归(SVR)模型,其中SVR在基础模型中预测能力最优。进一步引入基于Tent混沌映射改进的粒子群优化算法(TPSO)对SVR模型进行参数寻优,构建TPSO-SVR模型。与PSO-SVR相比,TPSO-SVR模型在团棵期测试集决定系数(R2)提高0.015,达到0.757,均方根误差(RMSE)降低0.006,至0.243;在旺长期测试集R2提高0.021,达到0.872,RMSE降低0.020,至0.253。结果表明,基于IRIV特征筛选与TPSO-SVR模型的分期反演方法可提高烟草关键生育期LAI估测精度,为烟草长势无损监测和田间精准管理提供技术参考。

关键词: 烟草, 叶面积指数, 特征筛选, 混沌序列, 粒子群算法, Tent映射

Abstract: To address the issues of low efficiency in the traditional measurement of tobacco leaf area index (LAI), feature redundancy in remote sensing inversion, and the tendency of model parameter optimization to easily fall into local optima, tobacco LAI estimation models suitable for different growth stages were constructed. The rosette stage and vigorous growth stage of tobacco were taken as the target growth stages, and 25 remote sensing variables were extracted based on unmanned aerial vehicle (UAV) multispectral imagery. Feature selection was conducted using competitive adaptive reweighted sampling (CARS), least angle regression (LARS), and iteratively retains informative variables (IRIV) algorithms. The results demonstrated that the IRIV algorithm exhibited superior comprehensive performance and could effectively reduce prediction errors. Based on the optimally selected features, Random Forest (RF), XGBoost, Back Propagation (BP) neural network, and Support Vector Regression (SVR) models were established, among which the SVR model demonstrated the best baseline predictive capability. Furthermore, a Particle Swarm Optimization algorithm improved by the Tent chaotic map (TPSO) was introduced to optimize the parameters of the SVR model, thereby constructing the TPSO-SVR model. Compared with the PSO-SVR model, the coefficient of determination (R2) of the TPSO-SVR model on the test set at the rosette stage increased by 0.015 to 0.757, and the root mean square error (RMSE) decreased by 0.006 to 0.243; at the vigorous growth stage, the R2 on the test set increased by 0.021 to 0.872, and the RMSE decreased by 0.020 to 0.253. The results indicated that the stage-specific inversion method based on IRIV feature selection and the TPSO-SVR model could improve the estimation accuracy of tobacco LAI at key growth stages, providing a technical reference for the non-destructive monitoring of tobacco growth and precision field management.

Key words: tobacco, LAI, feature selection, chaotic sequence, PSO, Tent map

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