作物残茬作为农田生态系统的重要组成部分,影响着农田生态系统中的营养物质、碳、水和能量的流动与循环.作物残茬覆盖度作为描述作物残茬数量和分布的重要指标,对于农田生态系统C循环和全球气候变化均有实际意义,具备重要的定量监测价值.遥感技术具有准确、经济、快速大面积监测的能力,因此利用遥感监测区域尺度的作物残茬覆盖度,受到国内外学者的关注.工作回顾总结了目前利用遥感监测作物残茬覆盖度的主要方法和最新研究进展,并根据基本方法的差异以及数据源的不同,从五个类别分别介绍了遥感监测原理与技术革新,对每一类方法的优点和缺陷进行分析,并提出了相应的改进措施.最后对作物残茬覆盖度遥感监测方法的发展趋势进行了展望.%Crop residue, as an important element of agro-ecosystem, can influence the flow of nutrients, carbon, water, and energy in agro-ecosystem. As a crucial indicator of distribution of crop residue, crop residue fractional cover is a key parameter of agro-ecosystem carbon cycle process model. Since remote sensing can easily obtain quantities of data, many researches were carried out on monitoring crop residue fractional cover with remote sensing. The present paper summarizes crop residue fractional cover estimation methods and latest progress in remote sensing, and these methods are classified into five categories according to the differences in methodologies and data sources. The principle of every method is described and compared. The advantages and shortages are also discussed and analyzed. Eventually, this paper points out some methods that should be improved, and presents the prospects of crop residue fractional cover estimation in the future.
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