title: The spatial distribution and emission of nitrous oxide (N2O) in a large eutrophic lake in eastern China: anthropogenic effects.
abstract: The emission of N(2)O from China is globally significant, but relatively few direct observations have been made in many of the fresh water environments most likely to be important sites of N(2)O production. In this paper, N(2)O saturations were examined in the ecologically heterogeneous, eutrophied, Lake Taihu, as well as in surrounding rivers in eastern China. The emissions of N(2)O were estimated and compared with those from other landscapes within the Lake Taihu drainage basin. We found that anthropogenically-enhanced inorganic N inputs act as a limited primary control on the spatial distribution of N(2)O saturations in heavily eutrophied parts of the lake only and that overall, lake N(2)O production and emission are not raised as significantly as expected due to high N inputs. In comparison, the heavily eutrophied river network is an important fraction of the local N(2)O budget, and when considered together with emissions of N(2)O from the lake, constitute a major (10-50% depending on season) fraction of total N(2)O emissions from the Lake Taihu drainage basin.
authors.affiliation: The State Key Laboratory of Environmental Geochemistry, the Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, PR China.
authors.forename: Shilu
authors.initials: S
authors.lastname: Wang
authors.forename: Congqiang
authors.initials: C
authors.lastname: Liu
authors.forename: Kevin M
authors.initials: KM
authors.lastname: Yeager
authors.forename: Guojiang
authors.initials: G
authors.lastname: Wan
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Faxiang
authors.initials: F
authors.lastname: Tao
authors.forename: Yingchun
authors.initials: Y
authors.lastname: Lu
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.forename: Chengxin
authors.initials: C
authors.lastname: Fan
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D005068:Eutrophication / Q000502:physiology*; D005618:Fresh Water / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*; D012995:Solubility; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D009609:Nitrous Oxide