Lake Baiyangdian, a largest wetland ecosystem in North China Plain, has dried up on seven occasions since the 1960s. Inrecent years, more than one billion of cubic meters of water from upstream reservoirs and Yellow river have beentransported to the lake to rescue the shrinking wetlands. Since the Lake Baiyangdian was actually composed of 143 smalllakes and more than 70 villages with large or small area of cropland, dynamic distribution of aquatic plants in wetlandsuch as reed and associated growth condition of these allowed to monitor the changes of wetland landscape and waterquality to support the policy applications of water conveyance and wetland environmental treatment and control.Assisted with ground survey analyses and Landsat TM image, the MODIS 250 m time series Normalized DifferenceVegetation Index (NDVI), given its combination of medium spatial and high temporal resolution, were applied to detectthe unique rapid growth stage of reed in the spring from adjacent crops such as winter wheat, cotton, and spring maize,of which has a similar phenology in development of leaf area index, and dynamic reed areas were mapped in recentdecade. Landscape changes of the wetland were analyzed using maps of reed area and hydrological data.
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