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Some of Robinia Pseudoacacia Forests have been dead or dieback in the Yellow River Delta Since 1990s. We evaluated 376 trees at 40 sites across the study area using the USFS Crown Condition Rating Guide, and separated Robinia Pseudoacacia into four levels of tree vigor. The area of Robinia Pseudoacacia was extracted from Landsat TM image using supervised classification. NDVI, NDWI, SAVI, MSAVI and...
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