Shanghai land area is about 7 000 km2,of which 65% has been built up by accumulation of Changjiang riverine sediment in last 6 000 years,and 17.5% is newly reclaimed land from coastal wetland.Land reclamation has greatly eased the tense relationship between socioeconomic development and available land resource in Shanghai,effectively slowing the reducing magnitude and speed of farmland area.In the recent decades,Changjiang sediment discharge has dramatically decreased especially after the completion of Thre...
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