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基于红边参数的枸杞土壤水分反演模型研究 被引量:4

Retrieval Model of Lycium Barbarum Soil Moisture Based on Red Edge Parameters
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摘要 为了快速准确地诊断枸杞水分需求,利用地物光谱仪实测枸杞关键生育期不同灌溉水平的叶片反射高光谱数据,应用光谱一阶微分方程,获取枸杞微分光谱680~760 nm波段的红边参数,分析红边位置λ_(re)、红边面积S_(dre)、红边振幅D_(λre)、红边偏度D_(λre)和红边峰度K_(λre)在不同处理下的变化,探讨了不同生育期内土壤水分与红边参数的相关性。结果表明,同一生育期内红边位置不会随着灌溉水平变化而发生偏移,各处理同一生育期内红边位置基本相同;土壤水分在枸杞休眠期和开花期与红边偏度相关性最好,在新梢开花期与红边峰度的相关性最好,展叶期与红边面积的相关性最好,选择各生育期与土壤水分相关性最好的红边参数建立水分估算反演模型,反演方程分别为休眠期:Y=151.581 X-261.325 X^(2)-3.169;开花期:Y=e^((1.748-0.016/X));新梢开花期:Y=e^((-28.786-44.38/X));展叶期:Y=82.116X-116.648 X^(2)+13.037。 In order to diagnose the water requirement of Lycium barbarum rapidly and accurately,hyperspectral data of leaf reflection at different irrigation levels in key growth periods were measured by ground matter spectrometer,and the red edge parameters of the differential spectrum of Lycium barbarum in the band of 680760 nm were obtained by using the first-order spectral differential equation.The changes of red edge position,red edge area,red edge amplitude,red edge skewness and red edge kurtosis under different treatments were analyzed,and the correlation between soil moisture and red edge parameters in different growth periods was analyzed.The results showed that the position of the red edge did not shift with the change of irrigation level in the same growth period,and remained consistent during the period.Soil moisture has the best correlation with D_(λre) at dormant and flowering stage,with K_(λre) at flowering stage of new shoots and S dre at leaf-spreading stage.One of the red-edge parameters having the best correlation with soil moisture was selected to establish the soil moisture fitted equation.The equations in the different growth period were as follows,Y=151.581 X-261.325 X^(2)-3.169 for dormant period,Y=e^(1.748-0.016/X)for flowering stage,Y=e^(-28.786-44.35/X)for the flowering period of new shoots,Y=82.116 X-116.648 X^(2)+13.037 for leaf spreading stage.
作者 袁念念 吴娟 熊玉江 包玉斌 杨静 刘凤丽 李虎 YUAN Nian-nian;WU Juan;XIONG Yu-jiang;BAO Yu-bin;YANG Jing;LIU Feng-Li;LI Hu(Agricultural Water Conservancy Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Ningxia Remote Sensing Survey Institute(Ningxia Data and Application Center of High Resolution Earth Observation System),Yinchuan 750001,China;Geophysical and Geochemical Explorations Institute of Ningxia hui Autonomous Region,Yinchuan 750001,China;College of Hydraulic and Environmental Engineering in China Three Gorges University,Yichang 443002,Hubei Province,China)
出处 《节水灌溉》 北大核心 2021年第10期84-88,共5页 Water Saving Irrigation
基金 宁夏回族自治区自然科学基金项目(2020AAC03461)。
关键词 遥感 红边参数 土壤水分 枸杞 叶片光谱 remote sensing red edge parameter soil moisture matrimony vine leaf spectrum
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