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Long-term phosphorus addition enhances the biodegradability of dissolved organic carbon in a nitrogen-limited temperate freshwater wetland
Mao, Rong1,2; Zhang, Xin-Hou1; Li, Si-Yue2; Song, Chang-Chun1; Mao, Rong3,4; Zhang, Xin-Hou3; Li, Si-Yue4; Song, Chang-Chun3
2017-12-15
摘要Phosphorus (P) enrichment is expected to strongly influence dissolved organic carbon (DOC) biodegradation. However, the relationship between P availability and DOC biodegradation is largely unknown in nitrogen (N)limited ecosystems. Here, we investigated the changes in the ratio of DOC to dissolved total nitrogen (DTN), specific UV absorbance at 254 nm(SUVA(254)), and DOC biodegradation in surface water and soil pore water (0-15 cm depth) following eight years of multi-level P addition (0, 1.2, 4.8, and 9.6 g Pm-2 year(-1)) in an N-limited freshwater marsh in Northeast China. We found that P addition caused an increase in DOC biodegradation in surface water and soil pore water, irrespective of the P addition levels. Compared with the control treatment, the P addition rates of 1.2, 4.8, and 9.6 g Pm-2 year(-1) increasedDOC biodegradation by 20.7%, 15.2%, and 14.5% in surface waters, and 11.3%, 9.4%, and 12.0% in soil pore waters, respectively. The DOC biodegradationwas separately negatively correlated with the DOC: DTN ratio and SUVA(254), indicating that the positive effect of P addition on DOC biodegradation was caused by the elevated N concentration and the reduced DOC aromaticity. Our findings suggest that P enrichment enhances the biodegradability of DOC through increased N availability and altered DOC chemical composition, which would accelerate DOC loss from the waters and alter ecosystem C balance in N-limited temperate wetlands. (C) 2017 Elsevier B.V. All rights reserved.
关键词Stoichiometry Carbon cycle Carbon dioxide Decomposition Eutrophication Marsh
DOI10.1016/j.scitotenv.2017.06.200
发表期刊SCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
卷号605页码:332-336
收录类别SCI
WOS记录号WOS:000408275500036
语种英语