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| 铵态氮源和碳源对土壤N2O、CO2释放的影响 |
| Effect of Ammonium Nitrogen Source and Carbon Source on the CO2 and N2O Emissions of Soil |
| 投稿时间：2015-07-27 |
| DOI：10.13254/j.jare.2015.0181 |
| 中文关键词: 华北地区 铵态氮源 碳源 N2O CO2 |
| 英文关键词: North China ammonium nitrogen source carbon source N2O CO2 |
| 基金项目:农业部"948"项目(2012-Z36);国家自然科学基金项目(40771098);河北教育厅项目(Q2012130) |
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| 中文摘要: |
| 在田间持水量WFPS为70%、温度为20℃的条件下,通过室内静态培养方法研究铵态氮源与不同碳源结合,对华北平原典型小麦-玉米轮作体系土壤N2O、CO2释放的影响。其中,碳源种类分别为葡萄糖、果胶、淀粉、纤维素、木质素和秸秆。结果表明添加葡萄糖和果胶有效促进了土壤N2O的释放,并在第1 d达到最大值,分别为4039.85 μg N2O-N·kg-1·d-1和2533.44 μg N2O-N·kg-1·d-1;添加纤维素和只施秸秆处理降低了N2O释放。施入碳源增加了CO2释放,顺序为纤维素> 淀粉> 葡萄糖> 果胶> 秸秆> 木质素。培养结束后土壤中铵态氮几乎消耗完全,除添加葡萄糖处理外,其他施碳土壤的硝态氮含量均有所增加。在培养前3 d,土壤NH4+和NO3-总含量与N2O释放量显著相关。 |
| 英文摘要: |
| To study the effect of ammonium nitrogen source combined with different carbon sources, which included glucose, pectin, starch, cellulose, lignin and straw, on N2O and CO2 emissions of soil in the typical wheat-maize rotation system in typical North China plain, the experiment was carried out through the static incubation-gas chromatograph method, with the WFPS of 70% and the temperature of 20℃. The results showed that the addition of glucose and pectin could effectively promote N2O emissions, with the peak values of 4 039.85 μg N2O-N·kg·d-1 and 2 533.44 μg N2O-N·kg·d-1 on the first day, respectively; while the cellulose and straw reduced N2O emissions. The carbon source increased CO2 emissions, the order was cellulose> starch> glucose> pectin> straw> lignin. The ammonium nitrogen in soil was almost completely consumed after the incubation. Except the addition of glucose, the nitrate nitrogen contents of the soil added the other carbon sources were increased. In the first 3 days of the incubation, the total contents of NH4+ and NO3- in soil were significantly correlated with N2O emissions. |
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