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Published on: October 29, 2016
Long-Term Atmospheric Nitrogen Deposition Enhances Forest Production by Suppressing Microbial Competition for
Xianzhen Luo1,2,3, Yuanwen Kuang1,2, Dazhi Wen1,2
1Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of National Forestry and Grassland Administration on Plant Conservation and Utilization in Southern China, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.
Canopy nitrogen addition surprisingly boosts forest growth and phosphorus uptake, even in phosphorus-limited ecosystems. This challenges traditional ecological stoichiometry, showing canopy processes are key to understanding forest responses to nitrogen deposition.
Area of Science:
- Ecology
- Forest Science
- Biogeochemistry
Background:
- Ecological stoichiometry predicts nitrogen deposition increases phosphorus limitation in forests.
- This hypothesis has not been tested with canopy nitrogen addition (CN) experiments considering canopy processes.
Purpose of the Study:
- To investigate the effects of canopy nitrogen addition on phosphorus limitation and forest productivity.
- To test the hypothesis that nitrogen deposition exacerbates phosphorus limitation in subtropical forests.
Main Methods:
- A 10-year experiment involving canopy nitrogen addition (CN) and understory nitrogen addition (UN) in subtropical forests.
- Meta-analysis of 151 published articles on forest nitrogen addition experiments.
Main Results:
- CN unexpectedly increased plant biomass and phosphorus uptake, alleviating plant phosphorus limitation.
- CN enhanced soil acid phosphatase activity and phoC gene abundance, increasing P availability.
- Meta-analysis confirmed CN-induced increases in plant biomass and P uptake are widespread across forest ecosystems.
Conclusions:
- Canopy nitrogen addition can alleviate phosphorus limitation by enhancing plant P uptake and soil P availability.
- Findings challenge traditional ecological stoichiometry predictions and highlight the importance of canopy processes in forest responses to nitrogen deposition.
- Results have implications for predicting forest productivity under realistic nitrogen deposition scenarios.
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