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Materials and Methods

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摘要

Study Areas. Two different representative intensive agricultural regions were selected as study areas:(1)the Taihu region in east China(30~32°N, 119~122°E)in the alluvial delta of the Yangtze Rive and(2)the North China Plain in northeast China(32~41°N, 113~120°E)in the alluvial plain of the Yellow R