Nitrous oxide exchanges with the atmosphere of a constructed wetland treating wastewater Parameters and implications for emission factors

IF 2.3 4区地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES

Tellus Series B-Chemical and Physical Meteorology Pub Date : 2003-07-01 DOI:10.1034/J.1600-0889.2003.00034.X

A. Johansson, Å. K. Klemedtsson, L. Klemedtsson, B. Svensson

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引用次数: 75

Abstract

Static chamber measurements of N 2 O fluxes were taken during the 1998 and 1999 growth seasons in a Swedish constructed wetland receiving wastewater. The dominating plant species in different parts of the wetland were Lemna minor L ., Typha latifolia L . , Spirogyra sp . and Glyceria maxima (Hartm.) and Phalaris arundinacea (L.), respectively. There were large temporal and spatial variations in N 2 O fluxes, which ranged from consumption at –350 to emissions at 1791 μg N 2 O m −2 h −1 . The largest positive flux occurred in October 1999 and the lowest in the middle of July 1999. The average N 2 O flux for the two years was 130 μg N 2 O m −2 h −1 (SD = 220). No significant differences in N 2 O fluxes were found between the years, even though the two growing seasons differed considerably with respect to both air temperature and precipitation. 15% of the fluxes were negative, showing a consumption of N 2 O. Consumption occurred on a few occasions at most measurement sites and ranged from 1–350 μg N 2 O m −2 h −1 . 13–43% of the variation in N 2 O fluxes was explained by multiple linear regression analysis including principal components. Emission factors were calculated according to IPCC methods from the N 2 O fluxes in the constructed wetland. The calculated emission factors were always lower (0.02–0.27%) compared to the default factor provided by the IPCC (0.75%). Thus, direct application of the IPCC default factor may lead to overestimation of N 2 O fluxes from constructed wastewater-treating wetlands. DOI: 10.1034/j.1600-0889.2003.00034.x

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人工湿地处理废水时氧化亚氮与大气的交换参数及其对排放因子的影响

在1998年和1999年的生长季节，在瑞典一个接收废水的人工湿地中进行了氮氧通量的静态室测量。湿地不同区域的优势植物种类为小柠檬草(lena minor L .)、热带风叶(Typha latifolia L .)。水绵;分别为大甘油三酯(Hartm.)和蝴蝶兰(Phalaris arundinacea)。在-350 μg N 2o m−2 h−1的消耗和1791 μg N 2o m−2 h−1的排放之间存在较大的时空差异。1999年10月正通量最大，7月中旬最小。2年平均N 2o通量为130 μg N 2o m−2 h−1 (SD = 220)。尽管两个生长季节在气温和降水方面存在较大差异，但各年之间的氮氧通量没有显著差异。15%的通量是负的，表明在大多数测点都有氮的消耗，在1 - 350 μg N O m−2 h−1之间。含主成分的多元线性回归分析解释了氮氧通量变化的13-43%。根据IPCC的方法，从人工湿地的n2o通量计算排放因子。计算的排放因子始终低于IPCC提供的默认因子(0.75%)(0.02 ~ 0.27%)。因此，直接应用IPCC默认因子可能会导致高估人工污水处理湿地的氮氧通量。DOI: 10.1034 / j.1600-0889.2003.00034.x

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来源期刊

Tellus Series B-Chemical and Physical Meteorology 地学-气象与大气科学

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期刊介绍： Tellus B: Chemical and Physical Meteorology along with its sister journal Tellus A: Dynamic Meteorology and Oceanography, are the international, peer-reviewed journals of the International Meteorological Institute in Stockholm, an independent non-for-profit body integrated into the Department of Meteorology at the Faculty of Sciences of Stockholm University, Sweden. Aiming to promote the exchange of knowledge about meteorology from across a range of scientific sub-disciplines, the two journals serve an international community of researchers, policy makers, managers, media and the general public.