冬小麦播期遥感监测研究现状与展望

Research Progresses in Monitoring Winter Wheat Sowing Date by Remote Sensing

播期是影响小麦产量与品质的一个重要因素,冬小麦生产管理对播期的及时和准确监测有强烈需求。遥感数据源的日趋丰富及遥感定量化水平的日益提高,为大面积、低成本监测小麦播期提供了可能。本文对冬小麦播期遥感监测的研究进展进行了回顾,系统归纳了当前国内外播期遥感监测方法,分析了目前冬小麦播期遥感监测中存在的问题。推进高时空分辨率遥感数据的使用、强化多尺度传感器遥感数据融合算法的应用、开展冬小麦生长前期不同播期光谱数据的挖掘、探索冬小麦生长前期光谱与上茬作物时序遥感数据的综合及尝试遥感数据与作物模型同化方法的借鉴是冬小麦播期遥感监测的未来发展方向。

Sowing date is an important factor which would affect the yield and quality of winter wheat and there is a strong demand for obtaining regional wheat sowing date as soon as possible at the early stage of the wheat growth.The rapid development of remote sensing technology,such as data acquisition and quantitative level,makes it possible to monitor sowing time in a low-cost way across large spatial scales.In view of the present status of the subject at home and abroad,the problems existing in the current development were analyzed and a survey of recent progress in this study was summarized:(i)Improving the application of high spatial and temporal resolution data which can be accessible easily at present.(ii)Promoting the application of fusion model of data obtained from multi-sensors.(iii)Mining the useful information from the spectroscopic data deeply in the early stage of the season.(iv)Shifting the monitoring window forward by combining time series data obtained from the early part of the winter wheat growth with that from the maturation stage of the kharif crop on the same field.(v)Referencing the method of assimilating remotely sensed data into crop model.