顾及竹龄的毛竹叶片叶绿素含量的高光谱估算研究  

Hyperspectral Estimation of Chlorophyll Content in Phyllostachys edulis Leaves with Considering Bamboo Age

作　　者：胡卫江 高洪娣 刘海英 张勇 牛明月 刘亭秀 周宇峰[3] HU Wei-jiang;GAO Hong-di;LIU Hai-ying;ZHANG Yong;NIU Ming-yue;LIU Ting-xiu;ZHOU Yu-feng(Zhejiang Provincial Public Welfare Forest and State Owned Forest Farm Management Station,Hangzhou 310020,Zhejiang,China;Zhejiang Forest Resources Monitoring Center,Hangzhou 310020,Zhejiang,China;College of Environment and Resources,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China)

机构地区：[1]浙江省公益林和国有林场管理总站,浙江杭州310020 [2]浙江省森林资源监测中心,浙江杭州310020 [3]浙江农林大学环境与资源学院,浙江杭州311300

出　　处：《竹子学报》2024年第3期12-19,共8页Journal of Bamboo Research

基　　金：浙江省省院合作林业科技项目(2022SY05);浙江省重点研发计划项目(2021C02005)。

摘　　要：【目的】毛竹(Phyllostachys edulis)是1种具有较高经济效益和固碳能力的植物,高光谱遥感在植被研究中的应用使得估算叶绿素含量成为可能,对其进行研究具有重要的意义。【方法】该文选取3组不同年龄各5株毛竹叶片样本测定叶绿素含量和高光谱特征参数,采用光谱分析仪对毛竹叶片的光谱特性与叶绿素含量进行相关分析,分别建立了毛竹叶片绿峰反射率、红边内最大一阶微分值、绿峰反射率与红谷反射率的归一化值、红边内一阶微分的总和与蓝边内一阶微分的总和的比值等高光谱参数数据及叶绿素含量相关性的线性模型和指数模型,并对模型的稳定性和预测能力进行了检验。【结果】综合各年龄的毛竹叶片叶绿素的最佳光谱估算模型为红边内一阶微分的总和(SDr)与蓝边内一阶微分的总和(SDb)的归一化值,该指数函数模型为:y=1.8239exp(2.9336×x),相关系数R=0.543。【结论】高光谱反演实现对毛竹叶绿素含量的精确、快速和非破坏性监测,可为毛竹林遥感监测、健康评估和科学管理提供理论依据。【Objective】Phyllostachys edulis is a plant with significant economic benefits and carbon sequestration capabilities,the application of hyperspectral remote sensing in vegetation research makes it possible to estimate chlorophyll content,studying it is of great significance.【Method】This paper selects samples of Ph.edulis leaves from three different age groups,each comprising five plants,to measure chlorophyll content and hyperspectral characteristics parameters.A spectrometer is used to correlate the spectral properties of Ph.edulis leaves with their chlorophyll content.Linear and exponential models related to chlorophyll content are developed to link hyperspectral parameter data such as green peak reflectance,maximum firstorder derivative within the red edge,normalized value of green peak and red valley reflectance,and the ratio of the sum of firstorder derivatives within the red edge to those within the blue edge.The stability and predictive power of these models are also tested.【Result】The optimal spectral estimation model for chlorophyll in Ph.edulis leaves across all ages is the ratio of the sum of the firstorder derivatives within the red edge(SDr)to that within the blue edge(SDb).This exponential function model is:y=1.8239 exp(2.9336×x),correlation coefficient is R=0.543.【Conclusion】Hyperspectral inversion enables accurate,rapid,and nondestructive monitoring of chlorophyll content in Ph.edulis,which can provide theoretical basis for remote sensing monitoring,health assessment,and scientific management of bamboo forests.

关 键 词：叶绿素含量 高光谱 毛竹 模型 

分 类 号：S795.7[农业科学—林木遗传育种]