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grassland(2)
net primary productivity (npp)(2)
spatio-temporal characteristics(2)
vegetation index (ndvi)(2)
yunnan-guizhou-sichuan provinces(2)
checked area(1)
china(1)
climate change(1)
climatic factor(1)
coalfield ecosystem(1)
directly affected area(1)
ecotone(1)
estimation model(1)
forests(1)
gimms avhrr ndvi(1)
gimms avhrr/ndvi(1)
grassland npp(1)
human activity(1)
indirectly affected area(1)
inter - annual correlation(1)
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