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Secondary forests, created after heavy logging, are an important part of China’s forests. We investigated forest biomass and its accumulation rate in 38 plots in a tropical secondary forest on Hainan Island. These secondary forests are moderate carbon sinks, averaging 1.96–2.17 t C ha−1 a−1. Biomass increment is largely by medium-sized (10–35 m) trees. Tree mortality accounts for almost 30% of the...