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Effects of nitrogen Application on n_2o flux from Fluvo-Aquic Soil Subject to Freezing-Thawing Process

Agricultural Sciences in China 2010年第4期9卷 577-582页

作者： WAnG Feng GAo Shang-bin ZHAnG Ke-qiang LI Hai-bo BAI Li-jing HUAnG Zhi-ping MI Chang-hong Institute of Agro-Environmental Protection Ministry of Agriculture Tianjin 300191 P.R.China College of Plant Sciences Jilin Academy of Agricultural Science and Technology Jilin 132101 P.R.China

A lab-incubation experiment was conducted to investigate the effects of different forms of nitrogen application （ammonium, nH4＋-n; nitrate, no3--n; and amide-n, nH2-n） and different concentrations （40, 200 and 800 mg L-1） on n2o emission from the fluvo-aquic soil subjected to a freezing-thawing cycling. n2o emission sharply decreased at the start of soil freezing, and then showed a smooth line with soil freezing. In subject to soil thawing, n2o emission increased and reached a peak at the initial thawing stage. The average n2o emissions with addition of nH4＋-n, no3 -n and nH2-n are 119.01, 611.61 and 148. 22 ug m-2 h-1, respectively, at the concentration of 40 mg L-1; 205.28, 1 084.40 and 106.13 ug m2 h-1 at the concentration of 200 mg L-1; and 693.95, 1 820.02 and 49.74 ug m-2 h4 at the concentration of 800 mg L-1. The control is only 100.35 ug m-2 h-1. n2o emissions with addition of nH4＋-n and no3--n increased with increasing concentration, by ranging from 17.49 to 425.67% for nH4＋-n, and from 563.38 to 1458.6% for no3--n compared with control. There was a timelag for n2o emission to reach a steady state with an increase of concentration. In contrast, by adding nH2-n to soil, n2o emission decreased with increasing concentration. In sum, nH4＋-n or no3--n fertilizer incorporated in soil enhanced the cumulative n2o emission from the fluvo-aquic soil relative to amide-n. This study suggested that ammonium and nitrate concentration in overwintering water should be less than 200 and 40 mg L-1 in order to reduce n2o emissions from soil, regardless of amide-n.

关键词： freezing-thawing process nH4＋ -n no3--n amide-n n2o flux

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Minimizing n2o fluxes from full-scale municipal solid waste landfill with properly selected cover soil

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Journal of Environmental Sciences 2008年第2期20卷 189-194页

作者： ZHAnG Houhu HE Pinjing SHAo Liming QU Xian LEE Duujong State Key Laboratory of Pollution Control and Resources Reuse Tongji University Shanghai 200092 China Chemical Engineering Department ＂National＂ Taiwan University Taipei 10617 Taiwan China

Municipal solid waste landfills emit nitrous oxide （n2o） gas. Assuming that the soil cover is the primary n2o source from landfills, this study tested, during a four-year project, the hypothesis that the proper use of chosen soils with fine texture minimizes n2o emissions. A full-scale sanitary landfill, a full-scale bioreactor landfill and a cell planted with nerium indicum or Festuca arundinacea Schreb, at the Hangzhou Tianziling landfill in Hangzhou City were the test sites. The n2o emission rates from all test sites were considerably lower than those reported in the published reports. Specifically, the n2o emission rate was dependent on soil water content and nitrate concentrations in the cover soil. The effects of leachate recirculation and irrigation were minimal. Properly chosen cover soils applied to the landfills reduced n2o flux.

关键词： municipal solid waste landfill n2o flux cover soil leachate nitrification/denitrification environmental factors

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nitrous oxide fluxes from upland soils in central Hokkaido,Japan

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Journal of Environmental Sciences 2008年第11期20卷 1312-1322页

作者： Sonoko D.KIMURA Yo ToMA Ryusuke HATAno Graduate School of Agriculture Tokyo University of Agriculture and TechnologyTokyo 183-8509Japan Graduate School of Agriculture Hokkaido UniversitySapporo 060-8589Japan

nitrous oxide (n2o) fluxes from soils were measured using the closed chamber method during the snow-free seasons (middle April to early november),for three years,in a total of 11 upland crop fields in central Hokkaido,Japan.The annual mean n2o fluxes ranged from 2.95 to 164.17 μgn/(m2·h),with the lowest observed in a grassland and the highest in an onion field.The instantaneous n2o fluxes showed a large temporal variation with peak emissions generally occurring following fertilization and heavy rainfall eve...

关键词： mineral n pool n2o flux soil upland cropping system

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nitrous oxide Emission from Boreal Peatland in the Continuous Permafrost Zone,northeast China

Nitrous Oxide Emission from Boreal Peatland in the Continuou...

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2011 International Symposium on Water Resource and Environmental Protection(ISWREP 2011)

作者： Miao Yuqing 1 2 Song Changchun 1 Wang Xianwei 1 Sun Li 1 1 Key Laboratory of Wetland Ecology and Environment northeast Institute of Geography and Agroecology CAS Changchun China 2 Graduate University Chinese Academy of Sciences Beijing China

In the present study, we measured ecosystem n2o fluxes weekly using manual chambers from June to September 2010 in a permafrost peatland in northeast China. The fluxes were generally low, ranging from -21.9 to 25.6 μg m -2 h -1 （negative flux indicating uptake of n2o from the atmosphere into the soil） and showed large temporal variation with no clear pattern. The mean n2o flux during the observation period was -3.9 μg m -2 h -1 . In addition, n2o fluxes negatively correlated with the thawing depth, and had no correlation with soil temperature, moisture and water table. our result indicates that, in northeast China, boreal peatlands act as a n2o sink in the snow-free season. This would provide a negative feedback to climate warming in the boreal regions in the future. Due to short observation of n2o flux, more studies should be conducted to investigate annual fluxes and the factors which controlled the n2o fluxes.

关键词： n2o flux peatland permafrost global warming thaw depth

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