Nitrogen deposition affects both net and gross soil nitrogen transformations in forest ecosystems: A review

Nitrogen (N) deposition has rapidly increased and is influencing forest ecosystem processes and functions on a global scale. Understanding process-specific N transformations, i.e., gross N transformations, in forest soils in response to N deposition is of great significance to gain mechanistic insig...

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Bibliographic Details
Published in:Environmental pollution (1987) 2019-01, Vol.244, p.608-616
Main Authors: Cheng, Yi, Wang, Jing, Chang, Scott X., Cai, Zucong, Müller, Christoph, Zhang, Jinbo
Format: Article
Language:English
Subjects:
Ammonium Compounds - analysis
Forest ecosystem
Forests
Gross N transformation
Immobilization
Mineralization
N deposition
Nitrates - analysis
Nitrification
Nitrification - physiology
Nitrogen - analysis
Nitrogen Cycle - physiology
Soil - chemistry
Soil Microbiology
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Summary:Nitrogen (N) deposition has rapidly increased and is influencing forest ecosystem processes and functions on a global scale. Understanding process-specific N transformations, i.e., gross N transformations, in forest soils in response to N deposition is of great significance to gain mechanistic insights on the linkages between global N deposition and N availability or loss in forest soils. In this paper, we review factors controlling N mineralization, nitrification and N immobilization, particularly in relation to N deposition, discuss the limitations of net N transformation studies, and synthesize the literature on the effect of N deposition on gross N transformations in forest ecosystems. We found that more than 97% of published papers evaluating the effect of N deposition (including N addition experiments that simulate N deposition) on soil N cycle determined net rates of mineralization and nitrification, showing that N deposition significantly increased those rates by 24.9 and 153.9%, respectively. However, studies on net N transformation do not provide a mechanistic understanding of the effect of N deposition on N cycling. To date, a small number of studies (
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2018.10.054