Summary
Abstract Although water use strategies of tree species are critical for maintaining tropical rainforest ecosystem function, the water use pattern of dominant tree species in tropical secondary forests remain poorly understood. In this study, with stable isotopes, we analyzed the plant water use sources and intrinsic water use efficiency (WUEi) of five coexisting dominant tree species in tropical secondary rainforests on Hainan Island during the wet season. The results showed that the shallow soil (0–40 cm) had higher water content than that in deep soil (40–100 cm), the five dominant tree species in tropical secondary forests mainly utilized shallow soil water, with an absorption contribution of 57% compared to deep soil water (43%). Besides, there was no correlation between soil water con
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