Nitrous oxide fluxes from the littoral zone of a lake on the Qinghai-Tibetan Plateau

摘要: Nitrous oxide (N(2)O) fluxes were measured in six littoral mirco-zones of Lake Huahu on Qinghai-Tibetan Plateau the peak growing season years 2006 and 2007. The weighted mean N(2)O flux rate was 0.08 mg N m (-aEuro parts per thousand 2) h 1) (ranged from -0.07 to 0.35 1)). result relatively high scope boreal temperate lakes. Emergent plant zones (Hippuris vulgaris Glyceria maxima stands) recorded highest (0.11 +/- 0.24 0.17 1), respectively). Non-vegetated lakeshore lowest (0.03 0.11 1)), lower than that floating mat zone Carex muliensis (0.05 0.18 floating-leaved Polygonum amphibium (0.07 wet meadow 0.15 Standing water depths important factors explain such spatial variations fluxes. Significant temporal also found. Such variation may be dependent interaction regime thermal conditions, instead latter solely. These results showed importance lake, especially emergent zone, as a hotspot grazing meadows.