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- W4293334986 abstract "• Long-term N addition experiments were conducted in sapling and mature plantations. • Dual-isotope (δ 13 C and δ 18 O) approach was used to study iWUE response to N addition. • In saplings, iWUE increased with greater N additions, but not in mature trees. • We observed remarkably higher iWUE of saplings relative to mature individuals. • Decadal N input increased the divergence in iWUE between sapling and mature individuals. Intrinsic water-use efficiency (iWUE) is the ratio of the photosynthetic assimilation rate to stomatal conductance and is tightly linked with tree growth and mortality. Increasing atmospheric nitrogen (N) deposition has been recognized to have a profound influence on ecosystem functioning, especially in typically N- and water-limited temperate forests. However, the effects of N deposition on leaf-derived iWUE estimates and the underlying physiological mechanisms remain poorly understood, as well as effects related to the developmental stage of temperate plantation forests. Using leaf stable carbon and oxygen isotope (δ 13 C and δ 18 O) approaches, we investigated iWUE of sapling and mature larch plantations subjected to decadal N addition in northern China. Results showed that saplings had significantly higher leaf iWUE compared to mature individuals. Long-term N addition significantly increased iWUE by 6.85% in the sapling stand, with no remarkable changes occurred in the mature stand. In saplings, the N-addition-induced increase in iWUE could be attributed to enhanced photosynthesis (illustrated by higher leaf N concentration), while leaf shading may cause lower leaf photosynthesis regardless of N level in mature trees. The higher and temporal stable leaf iWUE in saplings imply conservative water-use strategy, whereas the opposites in mature trees imply profligate water-use strategy. Thus, the divergent responses of iWUE to decadal N addition should be considered for sustainable forest development under increasing atmospheric N deposition conditions." @default.
- W4293334986 created "2022-08-27" @default.
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- W4293334986 date "2022-11-01" @default.
- W4293334986 modified "2023-10-07" @default.
- W4293334986 title "Decadal nitrogen addition increases divergence in intrinsic water-use efficiency between sapling and mature larch plantations" @default.
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- W4293334986 doi "https://doi.org/10.1016/j.foreco.2022.120494" @default.
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