Abstract:Sanya River mangroves (18°15 3′N,109°30 8′E), distributing along the sh ore of the estuary or lagoon of downstream Sanya River which passes through Sany a City of Hainan Island in China and inpours into the top of Sanya Bay, are one of the southernmost mangroves in China. Among of them a thermophilic eurytopic species Rhizophora apiculata can form a pure species forest, which is the mo st typical tropical mangrove community in China. The litter fall of Rhizophora apiculata forest of Sanya River mangr...