盐渍化土壤偏振高光谱信息与土壤线的关系初探  

Study on the Relationship between Hyperspectral Polarized Information of Soil Salinization and Soil Line

作　　者：徐文茹[1] 韩阳[1] 秦艳[1] 金伦[1] 

机构地区：[1]东北师范大学地理科学学院,吉林长春130024

出　　处：《光谱学与光谱分析》2015年第10期2856-2861,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41301364);高等学校博士学科点专项科研基金项目(20120043120013);吉林省科技发展计划项目(20150520067JH);吉林省教育厅"十三五"规划课题资助

摘　　要：正确评价土壤盐渍化对地区农业生产与生态环境具有重要意义。土壤线对土壤盐渍化程度具有一定的指示作用,但在不同角度下观察获得的土壤光谱特征会发生变化,土壤线的参数值也会随之变化。依据以实验室测定的盐渍化土壤多角度偏振高光谱反射率,分析并确定土壤盐渍化程度与土壤线参数之间的关系,初步探求在偏振反射条件下土壤线最佳的获取方式。结果表明:(1)土壤光谱反射率随波段的增加逐步缓慢上升,趋于平缓。随着盐渍化程度的增强,土壤的光谱反射率先逐步降低至某一临界值后又逐步升高;(2)土壤的盐渍化程度与土壤线的斜率和截距均呈线性相关,随着盐渍化程度的增强,土壤线的斜率变小,截距变大;(3)探测天顶角影响偏振状态与土壤线参数的关系,当探测天顶角一定时,偏振状态与土壤线参数之间具有规律性。探测天顶角在0°-50°之间,随角度的变大,土壤线斜率变大,截距变小;(4)偏振状态影响土壤线参数与土壤盐渍化程度的相关性程度,初步确立偏振角度为90°,探测天顶角为25°状态下,建立的土壤盐渍化程度与土壤线参数关系模型较优。为定量反演土壤盐渍化程度提供新的途径。可以用于土壤的盐渍化程度评价。It has important significance to assess soil salinization correctly for agricultural production and ecological environment . Soil line can indicate soil salinization in a certain extent .But the soil spectral characteristics obtained at different angles will change with the changing of the soil line parameters .Base on polarized hyper‐spectral reflectivity obtained in the laboratory ,the study analyzes the relationship between the soil salinization and soil line parameters ,explores preliminarily the best way to obtain soil line .The results show ：（1） Soil spectral reflectance gradually increased slowly with increasing band .With the enhanced lev‐el of salinization ,soil spectral reflectance of the first to be gradually reduced to a critical value and then gradually increased .（2） Soil salinization has a linear correlation with the soil slope and intercept .With the enhanced level of salinization ,soil slope be‐comes smaller ,and intercept becomes larger .（3） Viewing zenith angle affects the relationship between the polarization state and soil line parameters .When viewing zenith angle is fixed ,there is a regularity between the polarization state and soil line parame‐ters .When the viewing zenith angle is between 0°~50° ,with the angle becoming larger ,soil slope becomes larger ,and intercept becomes smaller .（4） Polarization states affects degree of correlation between soil salinization and soil line parameters .When po‐larization angle is 90° and viewing zenith angle is 25° ,the relationship model between soil salinization and soil line parameters is better .The research results can be used to evaluate the degree of salinization soil .

关 键 词：土壤线 偏振 高光谱 盐渍化土壤 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]