摘要
土壤侵蚀遥感调查具有宏观、快速、信息量大等优点,但是实际应用中有3大制约因素:1)廉价高分辨率影像的获取;2)科学准确的判读和解译方法;3)成熟的土壤侵蚀评价模型或系统的观测数据。我国普遍缺乏土壤侵蚀评价模型和长期观测数据,技术问题比较突出。土壤侵蚀遥感调查中,采用经验分级指标法得出土壤侵蚀现状或强度,影响了土壤侵蚀评价的精度、准确性和应用范围。利用土壤侵蚀核素示踪技术测算不同土地利用单元的土壤侵蚀量,能够突破了遥感土壤侵蚀调查依赖模型和观测数据的限制,实现土壤侵蚀评价的宏观与微观、点与面、估算与实测的结合,为区域土壤侵蚀快速评价提供一条高效途径。
Remote sensing technique is widely used in soil erosion assessment due to its fitness for large-scale and rapid investigation. However, there are three limitations in the current applications： 1） to obtain cheap and high-resolution images; 2） to interpret the image scientifically and accurately; and 3） to get available soil erosion monitoring data and assessment model. In China, due to lack of necessary erosion monitoring data, erosion degree are usually graded according to the subjective judgments by interpreters. It is no doubt that the erosion investigation by this method is imprecise and incredible. This paper recommends the methodology combining radionuclide tracing and remote sensing techniques to monitor and assess regional soil erosion. The hybrid method is efficient in soil erosion monitoring and assessment in terms of regional and local, plot and small watershed, quantitative and qualitative.
出处
《中国水土保持科学》
CSCD
2008年第3期24-27,37,共5页
Science of Soil and Water Conservation
基金
中国科学院西部行动计划项目“三峡库区水土流失与面源污染控制试验示范”(KZCX2-XB2-07-01)
国家自然科学基金“流域侵蚀产沙的沉积物137Cs解译模型”(40671120)
关键词
区域
土壤侵蚀
遥感
核素示踪
region
soil erosion
remote sensing
radionuclide tracing
