Journal
JOURNAL OF FOREST RESEARCH
Volume 16, Issue 5, Pages 341-350Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1007/s10310-011-0267-4
Keywords
Carbon sequestration; Chinese forests; Nitrogen deposition; Nitrogen leaching; Nitrogen retention
Categories
Funding
- National Natural Science Foundation of China [40703030, 30972365]
- Japan Society for Promotion of Science (JSPS) [21310008, 20-08421]
- Key laboratory of vegetation restoration and management of degraded ecosystems, South China Botanical Garden, Chinese Academy of Sciences
- Villum Foundation, Denmark
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Data have been compiled from published sources on nitrogen (N) fluxes in precipitation, throughfall, and leaching from 69 forest ecosystems at 50 sites throughout China, to examine at a national level: (1) N input in precipitation and throughfall, (2) how precipitation N changes after the interaction with canopy, and (3) whether N leaching increases with increasing N deposition and, if so, to what extent. The deposition of dissolved inorganic N (DIN) in precipitation ranged from 2.6 to 48.2 kg N ha(-1) year(-1), with an average of 16.6 kg N ha(-1) year(-1). Ammonium was the dominant form of N at most sites, accounting for, on average, 63% of total inorganic N deposition. Nitrate accounted for the remaining 37%. On average, DIN fluxes increased through forest canopies, by 40% and 34% in broad-leaved and coniferous forests, respectively. No significant difference in throughfall DIN inputs was found between the two forest types. Overall, 22% of the throughfall DIN input was leached from forest ecosystems in China, which is lower than the 50-59% observed for European forests. Simple calculations indicate that Chinese forests have great potential to absorb carbon dioxide from the atmosphere, because of the large forest area and high N deposition.
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