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Several studies have explored plant nutrient acquisition during ecosystem succession, but it remains unclear how age affects nitrogen (N) acquisition by the same tree species. Clarifying the age effect will be beneficial to fertilization management through improving N-use efficiency and reducing the risk of environmental pollution due to NO 3  −  leaching. To clarify the effect of age on N uptake, rubber ( Hevea brasiliensis  (Willd. ex A. Juss.) Muell. Arg.) plantations of five ages (7, 16, 24, 32 and 49 years) were selected in Xishuangbanna of southern China for brief  15 N exposures of intact roots using field hydroponic experiments.  15 N-labeled NH 4  + , NO 3  −  or glycine were applied in this study. All targeted rubber trees uptake rates followed an order of NH 4  +  &gt; glycine &gt; NO 3  − . As age increased, NH 4  +  uptake increased first and then decreased sharply, partly consistent with the pattern of soil NH 4  +  concentrations. Uptake of glycine decreased first and then increased gradually, while no significant change of NO 3  −  uptake rates existed with increasing age. Overall, rubber trees with ages from 7 to 49 years all showed a preference for NH 4  +  uptake. Young rubber trees (7 and 16 years) had higher NH 4  +  and lower glycine preferences than older trees (24, 32 and 49 years). Mycorrhizal colonization rates of rubber trees were higher in intermediately aged plantations (16, 24 and 32 years) than in plantations aged 7 and 49 years. A positive relationship was observed between arbuscular mycorrhizal colonization rates and NO 3  −  preference. The results from this study demonstrate that rubber trees do not change their preference for NH 4  +  but strongly decreased their reliance on it with age. These findings indicate that the shift of N uptake patterns with age should be taken into account for rubber fertilization management to improve N-use efficiency and reduce the risk of environmental pollution during rubber production.

Age alters uptake pattern of organic and inorganic nitrogen by rubber trees