Theory and Technology of Land Degradation Monitoring and Evaluation in Arid Area based on Linear Spectral Mixture Analysis Using Wide-band Remote Sensing

Remote sensing monitoring of land degradation can serve policy formulation, restoration optimization, effect evaluation and security early warning, and it is urgent to establish and improve the basic theoretical framework and technical system. Based on the theory of land degradation (desertification) in arid areas in China and abroad, this paper establishes the theoretical framework of remote sensing monitoring of land degradation in arid areas coupled with bio-physical-socio-economic systems, taking ecosystem services as the link and vegetation-habitat interaction as the core. Secondly, based on the proposed theoretical framework and the consistency, stability, inclusiveness and applicability of remote sensing monitoring, a technical method system for remote sensing monitoring and evaluation in arid areas is established with wide-band remote sensing as an example, which mainly includes five parts: local environmental knowledge mining, multi-season spectral mixture decomposition, dryland ecosystem structure analysis and mapping, quantification and evaluation of dryland ecosystem function and dynamic monitoring of dryland ecosystem degradation process. The theoretical framework and technical system can provide reference for remote sensing monitoring, evaluation and comparative analysis of land degradation in different regions and scales in arid areas.