Journal Article 7440-44-0 Carbon Research Support, U.S. Gov't, Non-P.H.S. protected area 059QF0KO0R China's major river deltas El Niño Mar Amarillo Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Spartina alterniflora Water Yellow Sea aboveground carbon ajuste de límites anthropogenic carbon uptake/emissions boundary adjustment cambio de registro carbon cycle carbon sequestration coastal wetland structure conservation outcome degazettement downsizing drought forest cover changes humedales mareales land cover non‐forest woody vegetation