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globalchange

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enso(2)
abnormal first and last frost dates(1)
agriculture region(1)
atmospheric circulation index(1)
climate change(1)
climate factor(1)
climatic change(1)
correlation analysis(1)
cultivable area(1)
drought frequency(1)
drought trend(1)
et0(1)
extreme drought/wet event(1)
extreme temperature indices(1)
gansu(1)
gansu province(1)
ndvi(1)
northern china(1)
spatial distribution(1)
spatial-temporal pattern(1)
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