Abstract:

The waterlogged cropland,which seriously affects the farm production, is widely distributed in south China. In this paper,the physical and ecological characters of the waterlogged cropland and its identification using remotely sensed image in Honghu,Sihu watershed are studied.Based on data including the MODIS products from 2002 to 2011,the soil and land cover data, the differences between the normal and waterlogged cropland in albedo,Enhanced Vegetation Index(EVI),land surface night temperature,land surface temperature between day and night and apparent thermal inertial are compared systematically.The differences between these indices are interpreted and proved based on the early researches.Result shows that the values of albedo,EVI and land surface temperature between day and night of the normal cropland are higher than those of the waterlogged cropland,whereas the values of land surface night temperature and apparent thermal inertial are lower than those of the waterlogged cropland throughout the majority of the year.The differences of the five indicators are also reflected in the mean values of these indicators.The EVI of the waterlogged cropland is higher than the normal cropland in June and July.Maybe the waterlogged cropland grows faster than the normal cropland when all the factors such as rain,heat and fertiliser in good condition.These characters provide useful information for the identification of the spatial pattern and dynastic change of waterlogged cropland