Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4758961 | Agricultural and Forest Meteorology | 2017 | 8 Pages |
Abstract
Subtropical forestland soils are important sources of nitrous oxide (N2O); however few studies have evaluated the effects of sulfate (S) deposition and its interaction with nitrogen (N) on soil N2O emissions from subtropical forestland. A field experiment was conducted in subtropical forestland in Yingtan, Jiangxi Province, China, between June 2011 and May 2013, to measure soil N2O fluxes under three N (NO3â) application levels (0, 40, and 80 kg N haâ1 yrâ1), two S (SO42â) levels (0 and 45 kg S haâ1 yrâ1), and their combinations. The soil N2O flux was significantly (P < 0.05) correlated with only soil temperature in all treatments over the study period; however, soil moisture, and NH4+ and NO3â contents were also included in the stepwise multiple linear regression equations during the N and/or S application period (March to September). N2O emissions under natural conditions in the subtropical forestland were estimated at 0.42 kg N2O-N haâ1 yrâ1, and were significantly (P < 0.05) increased by 97-330% under the N application. In contrast, soil N2O emissions decreased to 0.36 kg N2O-N haâ1 yrâ1 in the S-applied soil and were significantly (P < 0.05) reduced by 27-36% in the S plus N-amended soils. Our results indicated that atmospheric N deposition potentially increases soil N2O emissions in subtropical forestland, whereas S addition has the potential to mitigate N2O emissions. Given that increased N deposition is expected in the future, S deposition in subtropical forestland soils could suppress N2O emissions to some extent.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Atmospheric Science
Authors
Jianling Fan, Yehong Xu, Zengming Chen, Jiao Xiao, Deyan Liu, Jiafa Luo, Nanthi Bolan, Weixin Ding,