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- Title
Spatiotemporal Variations in Nitrous Oxide Emissions from an Open Fen on the Qinghai-Tibetan Plateau: a 3-Year Study.
- Authors
Chen, Huai; Wang, Yanfen; Wu, Ning; Zhu, Dan; Li, Wei; Gao, Yongheng; Zhu, Qiu'an; Yang, Gang; Peng, Changhui
- Abstract
To understand spatial and temporal variations of nitrous oxide (NO) fluxes, we chose to measure NO emissions from three plant stands ( Kobresia tibetica, Carex muliensis, and Eleocharis valleculosa stands) in an open fen on the northeastern Qinghai-Tibetan plateau during the growing seasons from 2005 to 2007. The overall mean NO emission rate was about 0.018 ± 0.056 mg N m h during the growing seasons from 2005 to 2007, with highly spatiotemporal variations. The hummock ( K. tibetica stand) emitted NO at the highest rate about 0.025 ± 0.051 mg N m h, followed by the hollow stands: the E. valleculosa stand about 0.012 ± 0.046 mg N m h and the C. muliensis stand about 0.017 ± 0.068 mg N m h. Within each stand, we also noted significant variations of NO emission. We also observed the significant seasonal and inter-annual variation of NO fluxes during the study period. The highest NO emission rate was all recorded in July or August in each year from 2005 to 2007. Compared with the mean value of 2005, we found the drought of 2006 significantly increased NO emissions by 104 times in the E. valleculosa stand, 45 times in K. tibetica stand, and 18 times in the C. muliensis stand. Though there was no significant relation between standing water depths and NO emissions, we still considered it related to the spatiotemporal dynamics of soil water regime under climate change.
- Subjects
TIBETAN Plateau; SPATIOTEMPORAL processes; ATMOSPHERIC nitrous oxide; EMISSIONS (Air pollution); CLIMATE change; BIOGEOCHEMISTRY; GREENHOUSE gases
- Publication
Water, Air & Soil Pollution, 2012, Vol 223, Issue 9, p6025
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-012-1336-9