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| Effects of nitrogen addition on greenhouse gas flux in a Stipa baicalensis grassland in Inner Mongolia |
| Received:January 06, 2017 |
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| KeyWord:Stipa baicalensis grassland;nitrogen addition;greenhouse gas;global warming potential |
| Author Name | Affiliation | E-mail | | ZHANG Jin-ling | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Department of Horticulture, Shenyang Agricultural University, Shenyang 110866, China | | | LI Jie | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHAO Jian-ning | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LIU Hong-mei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | WANG Yu | Hulun Buir Grassland Supervision and Administration Bureau of Inner Mongolia, Hulunbeier 021008, China | | | YANG Dian-lin | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | yangdianlin@caas.cn |
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| Abstract: |
| There is great significance in exploring the response of temperate meadow steppes to global climate change. The dynamics of greenhouse gas(CO2, CH4, and N2O) fluxes are essential for such; thus, the response of a grassland ecosystem to nitrogen addition in a Stipa baicalensis grassland in Inner Mongolia was measured. Four nitrogen addition levels of 0(CK), 30(N30), 50(N50), and 100(N100) kg N·hm-2 were used to determine the effects of nitrogen addition on greenhouse gas emissions during the growing season(June to October), using the methods of static chamber-box gas chromatography. We found that the Stipa baicalensis grassland was a source of CO2 and N2O, but a sink for CH4. Nitrogen addition increased the above-ground biomass of the plants significantly and enhanced the emissions of CO2 and N2O, whereas it decreased the uptake of CH4. The global warming potential of the treatments followed the order of N100>N30>N50>CK. Thus, N50 treatment not only significantly increased the above-ground biomass, but also reduced the increase of global warming potential. The fluxes of CO2, CH4 and N2O showed significant correlations with soil temperature, organic carbon and NO3--N content(P<0.05). CO2 and N2O fluxes also showed significantly positive correlations with soil moisture(P<0.05). In addition, CH4 and N2O fluxes had significant relationships with soil NH4+-N content(P<0.01). |
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