Littoral zones as the ''hotspots'' of nitrous oxide (N"2O) emission in a hyper-eutrophic lake in China [An article from: Atmospheric Environment]

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Description:
N"2O emissions were measured monthly for 1 year using the static chamber method along the littoral and pelagic zones of Meiliang Bay in hyper-eutrophic Taihu Lake. The results indicated that littoral zones were the ''hotspots'' of N"2O emissions (-278~2101@mgN"2Om^-^2h^-^1). While the littoral zone accounted for only 5.4% of the area of Meiliang Bay, the N"2O emissions from the littoral zones were about 43.6% of total emissions from the bay. The importance of spatial variation on N"2O emissions was demonstrated by dividing the lake into four unique zones through cluster analysis. The eulittoral zone was the key area of N"2O emissions with an annual 5% trimmed mean 429.5@mgN"2Om^-^2h^-^1, following by supralittoral (138.8@mgN"2Om^-^2h^-^1), infralittoral (98.9@mgN"2Om^-^2h^-^1), and pelagic zones (15.7@mg N"2Om^-^2h^-^1). Further, N"2O emissions showed a seasonal trend. Excessive N"2O emissions during algal bloom periods suggested that algae played a significant role in the emission of N"2O.