粤北丹霞山陡崖可见光-近红外(VNIR)反射光谱特征研究  

VNIR Characteristics of Rock Wall Hues at Danxia Mountain,Northern Guangdong,China

作　　者：章桂芳 叶雨朦 傅强 李宏卫 张珂 杨志军 王同皓 陆非凡 Zhang Guifang;Ye Yumeng;Fu Qiang;Li Hongwei;Zhang Ke;Yang Zhijun;Wang Tonghao;Lu Feifan(School of Earth Science and Engineering,Sun Yat-sen University,Zhuhai 519082,China;Guangdong Provincial Key Lab of Geological Processes and Mineral Resources,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;Guangdong Geological Survey Institute,Guangzhou 510080,China)

机构地区：[1]中山大学地球科学与工程学院,广东珠海519082 [2]广东省地质过程与矿产资源探查实验室,广东珠海519082 [3]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [4]广东省地质调查院,广州510080

出　　处：《热带地理》2024年第9期1702-1718,共17页Tropical Geography

基　　金：广东国家公园建设专项资金(2021GJGY026);广东省基础与应用基础研究基金(2019A1515010733);南方海洋科学与工程广东省实验室(珠海)创新团队建设项目(311022004)。

摘　　要：红色是丹霞地貌核心特征和重要标志,文章基于丹霞山陡崖可见光-近红外(VNIR)反射波谱曲线,分析不同颜色(红色表面、橘色表面和纯净白斑)、不同岩生植物覆盖的陡崖表面反射光谱的特征参数及它们与色调之间的定量关系。结果表明:1)红色表面和橘色表面样品在525和500 nm处的吸收深度、吸收面积与红度和橘度之间的相关性显著,且红色表面和纯净白斑在红度值和吸收特征处的吸收深度和吸收面积上差异明显,是区分这2类表面的有利参数;2)红色表面、橘色表面和纯净白斑在可见光波段的吸收位置具有显著不同,极有可能与这3类地层中的含铁矿物种类及含量的变化有关;3)黑色岩生植物、块状岩生植物和绿色岩生植物3类岩生植物在670 nm处的吸收深度与归一化植被指数(NDVI)均具有较大的差异,可作为区分3类岩生植物的有效指标,且两者具有显著的相关性;非白斑岩生植物覆盖类和白斑岩生植物覆盖类在670 nm处的吸收深度随着NDVI值增大而增加;4)白斑表面附着植被后,纯净白斑在430 nm处的吸收特征消失,在530与690 nm处的吸收特征向短波方向移动。China's Danxia landforms are characterized by their indicative red color.Portable ground object spectrometers are widely used owing to their small size,ease of operation in the field,rapid measurements,and simple operation.In this study,we analyzed the characteristic parameters of the reflection spectra of the Danxia rock wall surfaces(i.e.,red surfaces,orange surfaces,and pure white spots)and different types of plant cover,as well as their quantitative relationships with color tones,using the visible-near-infrared(VNIR)reflectance spectra of the rock walls.The results indicate that the absorption depths and areas of the red and orange surface samples were highly correlated at 525 and 500 nm,as were the redness and orangeness of the samples.The redness and orangeness of the indoor and outdoor samples were relatively consistent with the absorption depth and area growth rates;however,the indoor samples had larger absorption depth and area values.The absorption depth and area of the pure white spots at 530 nm was highly correlated with redness,but the red surface and pure white spot spectra exhibited considerably different redness values,absorption depths,and absorption areas at 525–530 nm.Thus,these are advantageous parameters for distinguishing between the two surface types.The absorption positions of the red surfaces,orange surfaces,and pure white spots in the visible spectrum differed considerably,which is likely related to changes in the iron mineral types and contents present in the strata.Compared to the red surface absorption position at 525 nm,that of the orange surface shifted in the shortwave direction to 500 nm,which may be related to lower hematite and higher goethite contents.The absorption of the pure white spots at 430 nm may be caused by their pyrite content.The absorption depths of black,blocky,and green plants at 670 nm were considerably correlated with Normalized Difference Vegetation Index(NDVI).The NDVI values and absorption depths of the three plant types had widely differing range distribut

关 键 词：丹霞山 VNIR 红色陡崖 色调 NDVI 粤北 

分 类 号：P627[天文地球—地质矿产勘探] TP751[天文地球—地质学]