Journal
ENVIRONMENTAL POLLUTION
Volume 243, Issue -, Pages 75-86Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2018.08.010
Keywords
N deposition; Forest; Soil biogeochemistry; Nutrient stoichiometry; Microbial biomass; China
Categories
Funding
- National Natural Science Foundation of China [41630750, 31330012]
- National Key Research and Development Program [2017YFC0503900]
- Support Project of High-level Teachers in Beijing Municipal Universities in the Period of 13th Five-year Plan [IDHT 20180518]
- Fok Ying Tong Education Foundation [161015]
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China has been experiencing a rapid increase in nitrogen (N) deposition due to intensified anthropogenic N emissions since the late 1970s. By synthesizing experimental and observational data taken from literature, we reviewed the responses of China's forests to increasing N deposition over time, with a focus on soil biogeochemical properties and acidification, plant nutrient stoichiometry, understory biodiversity, forest growth, and carbon (C) sequestration. Nitrogen deposition generally increased soil N availability and soil N leaching and decreased soil pH in China's forests. Consequently, microbial biomass C and microbial biomass N were both decreased, especially in subtropical forests. Nitrogen deposition increased the leaf N concentration and phosphorus resorption efficiency, which might induce nutrient imbalances in the forest ecosystems. Although experimental N addition might not affect plant species richness in the overstorey, it did significantly alter species composition of understory plants. Increased N stimulated tree growth in temperate forests, but this effect was weak in subtropical and tropical forests. Soil respiration in temperate forests was non-linearly responsive to N additions, with an increase at dosages of <60 kg N ha(-1) yr(-1) and a decrease at dosages of >60 kg N ha(-1) yr(-1). However, it was consistently decreased by increased N inputs in subtropical and tropical forests. In light of future trends in the composition (e.g., reduced N vs. oxidized N) and the loads of N deposition in China, further research on the effects of N deposition on forest ecosystems will have critical implications for the management strategies of China's forests. (C) 2018 Elsevier Ltd. All rights reserved.
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