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

被引:23
作者
Chen, Huai [1 ,2 ,3 ]
Wang, Meng [1 ]
Wu, Ning [1 ]
Wang, Yanfen [4 ]
Zhu, Dan [1 ]
Gao, Yongheng [5 ]
Peng, Changhui [2 ,3 ]
机构
[1] Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China
[2] NW Agr & Forest Univ, Coll Forestry, Yanglin 712100, Peoples R China
[3] Univ Quebec, Inst Environm Sci, Montreal, PQ C3H 3P8, Canada
[4] Grad Univ, Chinese Acad Sci, Beijing 100049, Peoples R China
[5] Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
关键词
Zoige plateau; Greenhouse gases fluxes; Littoral wetlands; N2O budget; Nitrogen cycling; Lake; DENITRIFICATION; EMISSIONS; N2O; WATER; DYNAMICS; METHANE; WETLAND; SOILS;
D O I
10.1007/s10661-011-1896-y
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nitrous oxide (N2O) fluxes were measured in six littoral mirco-zones of Lake Huahu on Qinghai-Tibetan Plateau in the peak growing season of years of 2006 and 2007. The weighted mean N2O flux rate was 0.08 mg N m (-aEuro parts per thousand 2) h (-aEuro parts per thousand 1) (ranged from -0.07 to 0.35 mg N m (-aEuro parts per thousand 2) h (-aEuro parts per thousand 1)). The result was relatively high in the scope of N2O fluxes from boreal and temperate lakes. Emergent plant zones (Hippuris vulgaris and Glyceria maxima stands) recorded the highest N2O flux rate (0.11 +/- 0.24 and 0.08 +/- 0.17 mg N m (-aEuro parts per thousand 2) h (-aEuro parts per thousand 1), respectively). Non-vegetated lakeshore recorded the lowest N2O flux (0.03 +/- 0.11 mg N m (-aEuro parts per thousand 2) h (-aEuro parts per thousand 1)), lower than that from the floating mat zone of Carex muliensis (0.05 +/- 0.18 mg N m (-aEuro parts per thousand 2) h (-aEuro parts per thousand 1)), the floating-leaved plant zone of Polygonum amphibium (0.07 +/- 0.11 mg N m (-aEuro parts per thousand 2) h (-aEuro parts per thousand 1)), and the wet meadow (0.07 +/- 0.15 mg N m (-aEuro parts per thousand 2) h (-aEuro parts per thousand 1)). Standing water depths were important factors to explain such spatial variations in N2O fluxes. Significant temporal variations in N2O fluxes were also found. Such temporal variation in N2O flux in the littoral zone may be dependent on the interaction of water regime and thermal conditions, instead of the latter solely. These results showed the importance of the littoral zone of lake, especially the emergent plant zone, as a hotspot of N2O fluxes in such grazing meadows.
引用
收藏
页码:545 / 553
页数:9
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