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Global patterns and substrate-based mechanisms of the terrestrial nitrogen cycle
Niu S. L.; Classen, A. T.; Dukes, J. S.; Kardol, P.; Liu, L. L.; Luo, Y. Q.; Rustad, L.; Sun, J.; Tang, J. W.; Templer, P. H.; Thomas, R. Q.; Tian, D. S.; Vicca, S.; Wang, Y. P.; Xia, J. Y.; Zaehle, S.
Source PublicationEcology Letters
KeywordLeaching mineralisation nitrification nitrogen deposition nitrogen loss plant N uptake saturation soil N retention threshold forest ecosystems nitrate uptake atmospheric deposition phosphorus limitation temperate forests uptake kinetics carbon-dioxide new-england oak forest saturation
AbstractNitrogen (N) deposition is impacting the services that ecosystems provide to humanity. However, the mechanisms determining impacts on the N cycle are not fully understood. To explore the mechanistic underpinnings of N impacts on N cycle processes, we reviewed and synthesised recent progress in ecosystem N research through empirical studies, conceptual analysis and model simulations. Experimental and observational studies have revealed that the stimulation of plant N uptake and soil retention generally diminishes as N loading increases, while dissolved and gaseous losses of N occur at low N availability but increase exponentially and become the dominant fate of N at high loading rates. The original N saturation hypothesis emphasises sequential N saturation from plant uptake to soil retention before N losses occur. However, biogeochemical models that simulate simultaneous competition for soil N substrates by multiple processes match the observed patterns of N losses better than models based on sequential competition. To enable better prediction of terrestrial N cycle responses to N loading, we recommend that future research identifies the response functions of different N processes to substrate availability using manipulative experiments, and incorporates the measured N saturation response functions into conceptual, theoretical and quantitative analyses.
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Cited Times:88[WOS]   [WOS Record]     [Related Records in WOS]
Document TypeSCI/SSCI论文
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GB/T 7714
Niu S. L.,Classen, A. T.,Dukes, J. S.,et al. Global patterns and substrate-based mechanisms of the terrestrial nitrogen cycle. 2016.
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