基于高光谱的滩涂土壤演化序列发育程度反演方法与机理研究

项目名称： 基于高光谱的滩涂土壤演化序列发育程度反演方法与机理研究

项目编号： No.41201215

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地理学

项目作者： 郑光辉

作者单位： 南京信息工程大学

项目金额： 25万元

中文摘要： 土壤高光谱技术可以快速反演土壤理化属性，为土壤发生学研究提供了新的思路。本项目采集不同成陆时间的滩涂土壤，构建沿海滩涂土壤时间序列，揭示土壤演化序列中氧化铁及粘土矿物的演变规律。利用连续统去除、微分等方法进行光谱数据预处理，结合美国地质调查局（USGS）光谱库中氧化铁及粘土矿物光谱曲线，筛选能够反映土壤发育程度的光谱特征参数，利用多元回归法反演土壤发育程度；利用偏最小二乘回归法反演氧化铁及粘土矿物含量，进而构建土壤发育程度反演模型。对比分析多元回归、偏最小二乘法的反演精度，探讨高光谱技术反演土壤发育程度的机理。本研究是土壤科学与遥感科学的交叉性综合研究，对于揭示滩涂土壤中氧化铁及粘土矿物演变特征、阐明高光谱反演土壤发育程度的机理具有一定理论意义。

中文关键词： 土壤时间序列；反射光谱；成土过程；风化程度；土壤有机质

英文摘要： The degree of soil evolution is important to the study of soil pedogenesis. It has important significance to study the soil evolution process, alteration of properties and the effect of human activity to soil properties. Soils chronosequences are valuable tools for investigating rates and directions of soil evolution as well as for testing theories of pedogesis.Some properties such as iron oxides and clay minerals will change with the age of soil evolution. So the type and content of iron oxides and clay minerals can indicate the degree and environment of evolution. There have been no significant technological breakthroughs in the characterization of soil profiles which is crucial for soil genesis, although significant advances have been achieved in other soil branches.Traditional soil analyses of determining soil age are time-consuming with high cost. Soil spectroscopy can track chemical and physical properties that can serve as tracers to monitor soil genesis and formation rapidly, which provides new method to the study of pedogenesis. Tidal soil derived from marine sediments formed different years ago which has relatively homogeneous parent material. So we can establish soil chronosequence to study soil evolution. The main objective of this study is to evaluate the ability of soil reflectance spectroscopy to

英文关键词： soil chronosequence；reflectance spectroscopy；pedogenic processe；development level；soil organic matter