| 张金玲,李洁,赵建宁,刘红梅,王宇,杨殿林.氮素添加对贝加尔针茅草原温室气体通量的影响[J].农业环境科学学报,2017,36(8):1640-1648. |
| 氮素添加对贝加尔针茅草原温室气体通量的影响 |
| Effects of nitrogen addition on greenhouse gas flux in a Stipa baicalensis grassland in Inner Mongolia |
| 投稿时间：2017-01-06 |
| DOI：10.11654/jaes.2017-0030 |
| 中文关键词: 贝加尔针茅草原 氮素添加 温室气体 全球增温潜势 |
| 英文关键词: Stipa baicalensis grassland nitrogen addition greenhouse gas global warming potential |
| 基金项目:国家自然科学基金项目（31170435） |
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| 摘要点击次数: 2102 |
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| 中文摘要: |
| 为了研究氮沉降对内蒙古贝加尔针茅草原主要温室气体CO2、CH4和N2O通量的影响，试验通过施加NH4NO3以模拟氮沉降增加，设置对照（0 kg N·hm-2，CK）、低氮（30 kg N·hm-2，N30）、中氮（50 kg N·hm-2，N50）和高氮（100 kg N·hm-2，N100）4个氮素添加水平，于牧草生长季（6-10月），采用静态箱-气相色谱法测定了CO2、CH4和N2O的通量。结果表明：贝加尔针茅草原是CO2和N2O的源、CH4的汇，与对照相比，氮素添加处理（N30、N50和N100）在显著增加植物地上生物量的同时，增加了CO2和N2O的累计排放量，并降低了CH4的累计吸收量，处理间全球增温潜势表现为N100>N30>N50>CK，所以N50处理既能显著增加草原植物地上生物量，又能够减缓全球增温潜势的增加。相关分析表明：3种温室气体排放通量与土壤温度、有机碳和NO3--N含量均显著相关（P<0.05），CO2和N2O排放通量与土壤含水率显著正相关（P<0.05），CH4和N2O排放通量与土壤NH4+-N含量极显著相关（P<0.01）。 |
| 英文摘要: |
| 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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