利用MODIS数据监测大面积土壤水分与农作物旱情研究

目的]更好地利用MODIS数据监测大面积土壤水分与农作物旱情。方法]在叙述MODIS传感器优点的基础上,介绍了几种MODIS数据监测土壤水分与农作物旱情的方法,讨论了土壤水分遥感监测中存在的问题和发展趋势。结果]热惯量法适用于裸露的土壤或作物前期生长的地区土壤水分监测,温度植被干旱指数法(TVDI)适用于植被覆盖度比较大地区的土壤水分监测,光谱法使用MODIS数据进行大面积、多时相土壤湿度监测是可行的,该方法从叶片光合作用和冠层温度两个方面研究了作物对水分胁迫的响应。结论]必须加强土壤水文模型和遥感模型、遥感反演方法和数字土壤工程的研究。

Study on Monitoring Soil Moisture and Crop Drought in Great Area by Using MODIS Data

Objective]This study aimed to better utilize MODIS dada to monitor the soil moisture and crop drought in great area.Method] Based on depicting advantage of MODIS sensor,the several methods of monitoring the soil moisture and crop drought by MODIS dada and the problems existing in remote sensing for water moisture and its development trend were discussed.Result] The thermal inertia method adapted to monitor the soil moisture in the area including the bared soil or the soil for crop prophase growth.TVDI method adapted to monitor the soil moisture in the area with bigger vegetation coverage.The spectrum method was feasible to monitor the multi temporal soil moisture in great area by MODIS dada,which study the reaction of crop to water stress from two aspects of the leaf photosynthesis and canopytemperature.Conclusion] It should be pay more attention to the studies on models of soil hydrology and remote sensing,on retrieval methods of remote sensing and on digital soil project.