基于经验正交变换的山地柑橘叶片光谱特征分析  

Analysis of Spectral Characteristics of Citrus Leaves in Yunnan Mountain Area by Using Empirical Orthogonal Transformation

作　　者：蔡娜 葛莹[1] 阮仁宗 李勇[1] 庄翠珍 CAI Na;GE Ying;RUAN Renzong;LI Yong;ZHUANG Cuizhen(School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China;School of Hydrology and Water Resources,Hohai University,Nanjing 210098,China;Xinping Chushi Agriculture Co.,Ltd.,Xinping 653407,China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100 [2]河海大学水文水资源学院,江苏南京210098 [3]新平褚氏农业有限公司,云南新平653407

出　　处：《甘肃科学学报》2023年第2期39-47,共9页Journal of Gansu Sciences

摘　　要：对山地柑橘叶片光谱特征进行分析。以云南省玉溪市新平县典型柑橘种植区为研究区,以不同高程、不同坡度与坡向采集的柑橘叶片为研究对象,采用ASD FieldSpec 4地物光谱仪测定不同地形下柑橘叶片光谱反射率,通过经验正交变换分析山地柑橘叶片光谱特征,并借助GIS工具分析地形因子对山地柑橘叶片光谱反射率空间分布的影响。结果表明,山地柑橘叶片光谱特征存在5个显著的变化区间,山地柑橘叶片光谱特征在空间上呈现整体一致性,且叶片光谱反射率高的区域主要分布在种植区西北部,反射率低的区域主要分布在种植区西南部;地形对山地柑橘叶片光谱特征空间分布影响较大,叶片光谱反射率高的区域主要分布在海拔600~800 m、坡度6°~25°和南坡(158°~203°)。经验正交变换可以有效地揭示由于地形差异所造成的山地柑橘叶片光谱特征的空间差异,该变换方法揭示了山地柑橘叶片光谱特征空间分布规律,适合于分析地形对山地柑橘叶片光谱特征空间分布的影响,可为山地柑橘叶片营养诊断提供科学依据。The purpose of this study is to explore how to analyze the spectral characteristics of mountain citrus leaves effectively.In this paper,the typical citrus growing area in Xinping County,Yuxi City,Yunnan Province was selected as the research area,and the citrus leaves collected at different elevations,slopes and aspects were sampled as the research objects.ASD FieldSpec 4 surface object spectrometer was used to measure the spectral reflectance of citrus leaves in different landforms.The spectral characteristics of citrus leaves in mountainous areas were analyzed by empirical orthogonal transformation,and the effect of terrain factors on the spatial distribution of spectral reflectance of citrus leaves in mountainous areas was analyzed by GIS tool.The results showed that there were five significant variation intervals of spectral characteristics of mountain citrus leaves,and the spectral characteristics of mountain citrus leaves showed overall consistency in space,and the high spectral reflectance region was distributed in the northwest of the planting area,and the low spectral reflectance region was distributed in the southwest of the planting area.Terrain factors have a great influence on the spatial distribution of spectral characteristics of citrus leaves in mountainous areas.The areas with high spectral reflectance were mainly distributed in the elevation of 600-800 m,slope of 6°-25°and southern slope of 158°-203°.The empirical orthogonal transformation can effectively reveal the spatial differences of the spectral characteristics of citrus leaves in mountainous areas caused by the difference of topography,which revealed the spectral characteristics of mountain citrus leaves,and was suitable for analyzing the effect of topographic factors on the spatial distribution of spectral characteristics of mountain citrus leaves.This paper could provide a scientific basis for nutritional diagnosis of mountain citrus leaves.

关 键 词：经验正交变换 光谱特征分析 地形因子 柑橘叶片 云南山地 

分 类 号：S17[农业科学—农业基础科学]