集成光学与微波遥感苏打盐碱地水盐含量的反演方法研究

The Northeast is an important grain-producing area of China, which is closely related to the protection of the national food security. As we all know, improvement of saline-alkali soil is one of the important means to increase production, which is of great significance. This project focuses on the large-scale soda saline-alkali soil in the west of Songnen plain. Based on the theory of wave propagation, closely connected with Multi-temporal optical and microwave remote sensing observations, and making full use of the saline-alkali soil identification advantage of optics and microwave remote sensing, this project aims at solving misclassification and omittance of saline-alkali soil with single remote sensing data source. What's more, going deeply into the relationship between salt characteristics and spectral information of soda saline-alkali soil and also the correlation between conductivity characteristics and microwave radiation / scattering, this project is going to find the retrieval method of water and salt characteristics through optics and microwave remote sensing, and provide theoretical methods and technical means for a master of the basic form, the temporal and spatial dynamics, evolution, and geographical distribution characteristics of soda saline-alkali soil, and also for its improvement and rational usage. Major innovations: the establishment of the iterative algorithm and model to identify water and salt of saline-alkali soil based on dual-band and dual-polarized microwave radiation; the foundation of the coupled model with satellite active microwave scattering data and ground-based passive microwave radiation data; the determination of the integration method of optical and microwave remote sensing data and the retrieval method of water and salt characteristics of soda saline-alkali soil.

东北是我国的重要粮食产区，是国家粮食安全的保障，对盐碱地的改造是实现粮食增产的重要手段之一，具有十分重要的意义。 本项目以我国松嫩平原西部大规模苏打盐碱地为研究对象，以波传播理论为基础，紧密结合多时相的光学与微波遥感观测数据，利用光学和微波遥感在盐碱地识别上的优势，解决单一遥感数据源的盐碱地错分和漏分问题，深入研究苏打盐碱地含盐特性与波谱信息的相关性，及苏打盐碱土的导电特性与微波辐射/散射信息的相关性，确定利用光学与微波遥感苏打盐碱地水盐含量的反演方法，为掌握苏打盐碱地的基本形态、时空动态变化过程、演变规律和地理分布特性，及苏打盐碱地的改良与合理利用，提供理论方法和技术手段。 主要创新工作：建立双频段双极化微波辐射信息反演盐碱土含水量含盐量迭代算法和模型；建立卫星主动微波散射数据与地基被动微波辐射数据的耦合模式；建立苏打盐碱地光学与微波遥感数据集成方法。

东北是我国的重要粮食产区，是国家粮食安全的保障，对盐碱地的改造是实现粮食增产的重要手段之一，具有十分重要的意义。. 本项目以我国松嫩平原西部大规模苏打盐碱地为研究对象，以波传播理论为基础，紧密结合多时相的光学与微波遥感观测数据，利用光学和微波遥感在盐碱地识别上的优势，深入开展盐碱土水盐特性遥感监测理论方法研究。重点开展了如下几方面的研究工作：（1）盐碱土壤介电特性研究及现有模型适用性验证；（2）盐碱土壤盐渍化程度的识别方法研究；（3）含盐土壤AIEM模型及参数敏感性分析；（4）定量反演土壤盐分算法研究；（5）双频双极化多角度土壤含盐量无损探测；（6）基于极化目标分解提取盐渍化信息技术；（7）基于反射光谱特征的龟裂盐渍土含盐量遥感反演方法研究；（8）高电导率土壤介质的电磁波传播特性研究。.通过本项目的研究解决了单一遥感数据源的盐碱地错分和漏分问题，确定了利用光学与微波遥感苏打盐碱地水盐含量的反演方法，为掌握苏打盐碱地的基本形态、时空动态变化过程、演变规律和地理分布特性，及苏打盐碱地的改良与合理利用，提供理论方法和技术手段。.主要创新工作：建立双频段双极化微波辐射信息反演盐碱土含水量含盐量迭代算法和模型；提出了基于极化目标分解提取盐渍化信息技术；建立了盐渍土土壤光谱特征与理化参数的反演模型，从而提高土壤含盐量的高光谱测量精度；建立了苏打盐碱地光学与微波遥感数据集成方法。