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棉花学报 ›› 2019, Vol. 31 ›› Issue (2): 138-146.doi: 10.11963/1002-7807.hslx.20190319

• 研究与进展 • 上一篇    下一篇

滴灌棉花不同生育时期冠层叶片叶绿素含量的高光谱估测模型

洪帅1(),张泽1,张立福3,马露露2,海兴岩1,王振1,张辉1,吕新1,*()   

  1. 1.石河子大学农学院,新疆 石河子832003
    2.石河子大学生命科学学院,新疆 石河子832003
    3.中国科学院遥感与数字地球研究所,北京100080
  • 收稿日期:2018-03-15 出版日期:2019-03-15 发布日期:2019-03-15
  • 通讯作者: 吕新 E-mail:1445102819@qq.com;lxshz@126.com
  • 作者简介:洪帅(1991—),男,硕士, 1445102819@qq.com
  • 基金资助:
    新疆生产建设兵团应用基础研究计划项目(2016AG002);中国博士后科学基金(2017M623282);石河子大学高层次人才科研启动项目(RC2X201516)

Hyperspectral Estimation Model of Chlorophyll Content in Cotton Canopy Leaves under Drip Irrigation at Different Growth Stages

Hong Shuai1(),Zhang Ze1,Zhang Lifu3,Ma Lulu2,Hai Xingyan1,Wang Zhen1,Zhang Hui1,Lü Xin1,*()   

  1. 1. School of Agriculture, Shihezi University, Shihezi, Xinjiang 832003, China
    2. School of Life Sciences, Shihezi University, Shihezi, Xinjiang, 832003, China
    3. Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2018-03-15 Online:2019-03-15 Published:2019-03-15
  • Contact: Lü Xin E-mail:1445102819@qq.com;lxshz@126.com

摘要:

【目的】利用高光谱数据对新疆北方地区不同生育时期滴灌棉花冠层叶片叶绿素含量进行估测,建立生长时序的叶绿素含量估算模型。【方法】以新陆早45号为试验材料,测定不同施氮水平和生育时期棉花冠层叶片叶绿素含量及对应的光谱反射率,分析了12种指数与叶绿素含量的关系,构建了滴灌棉花冠层叶片叶绿素含量的估测模型。【结果】棉花的4个生育时期(现蕾期、盛蕾期、花铃期和吐絮期)中冠层叶片叶绿素含量与Vogelmann红边指数1的相关系数都高,分别是0.944、0.907、0.895、0.930;采用多元回归方法建立的模型精度高于单指数线性模型,其决定系数都大于0.8,且均方根误差(RMSE)都较小。现蕾期模型(y=82.509x1+89.937x2-94.438)精度最好。【结论】针对不同生育时期建立的模型均可对棉花冠层叶片叶绿素含量进行估测,其中现蕾期模型监测效果最好。

关键词: 棉花; 高光谱; 叶绿素含量; 光谱指数

Abstract:

[Objective] This article is aimed to estimate the chlorophyll content of cotton canopy leaves in drip irrigation fields at different growth stages in northern Xinjiang and establish a model for estimating chlorophyll content in growth time series by using hyperspectral. [Method] Using Xinluzao 45 as the experimental material, the chlorophyll content and the corresponding spectral reflectance of cotton canopy leaves at different nitrogen levels and growing stages were measured, and the relationship between 12 indices and the chlorophyll content was analyzed. The estimation models of the chlorophyll content in cotton canopy leaves under drip irrigation were established. [Result] The correlation coefficient between the chlorophyll content of canopy leaves and Vogelmann red edge index was high in the four growing periods of cotton, and the correlation coefficient was 0.944, 0.907, 0.895, 0.930, respectively. And the spectral reflectivity was the highest at the flowering and boll period. The precision of the model established by the multivariate regression method is higher than that of the single exponential linear model with the determination coefficient more than 0.8 and the root mean square error smaller than that of the single exponential linear model. The model of the budding stage (y=82.509x1+89.937x2-94.438) has the best precision. [Conclusion] The chlorophyll content can be estimated by the models established at different growth stages, and the budding stage model has the best monitoring effect.

Key words: cotton; hyperspectral; chlorophyll content; spectral parameters