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| 硝态氮源及碳源有效性对土壤N2O和CO2排放的影响 |
| Effect of the Availability of Nitrate Nitrogen and Carbon Source on N2O and CO2 Emission from Soil |
| 投稿时间：2015-08-18 |
| DOI：10.13254/j.jare.2015.0206 |
| 中文关键词: 华北农田土壤 硝态氮源 碳源 氧化亚氮 二氧化碳 |
| 英文关键词: the North China agricultural soil nitrate nitrogen source carbon source nitrous oxide carbon dioxide |
| 基金项目:农业部"948"项目(2012-Z36);河北省科技计划项目(14227305D) |
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| 中文摘要: |
| 以华北平原农田土壤为对象,通过室内静态培养系统研究NO3--N与不同碳源组合对土壤N2O和CO2排放的影响。结果表明,NO3--N作为氮源和不同碳源施入土壤,除NO3-+纤维素,其余土壤N2O排放通量均高于对照组和只添加氮源土壤;NO3--N和不同碳源组合的CO2累积排放量均高于对照和只添加氮源土壤。NO3-+果胶的N2O排放量在第1 d达到最大值1383.42μg N·kg-1·d-1;NO3-+葡萄糖的CO2排放量在第1 d达到最大值370.13 mg C·kg-1·d-1,CO2累积排放量顺序为:葡萄糖 >果胶 >秸秆 >纤维素 >淀粉 >木质素。土壤NO3--N含量与N2O排放呈极显著正相关。总之,添加纤维素可以抑制N2O的排放,促进CO2排放,并增加土壤中NO3--N含量,添加其余碳源均会促进土壤N2O和CO2排放。 |
| 英文摘要: |
| Effects of the availability of nitrate nitrogen and different carbon sources on N2O and CO2 emission from soil of typical farmland in the North China were studied. The static culture systems were adopted in an indoor experiment. The results illustrated that, compared with single nitrate nitrogen fertilizer, combined different carbon sources and nitrate nitrogen fertilizer increased the emission of N2O from soil, except for cellulose; combined different carbon sources and nitrate nitrogen fertilizer increased the accumulated emission of CO2 from soil. The emission flux of N2O by treatment of pectin peaked 1383.42μg N·kg-1·d-1 on day 1.The emission flux of CO2 by treatment of glucose peaked 370.13 mg C·kg-1·d-1 on day 1, and the accumulated emission of CO2 order was:glucose >pectin >straw >cellulose >starch >lignin. It showed a highly signifcant positive correlation between the content of NO3--N and emission of N2O. Overall, combined cellulose and nitrate nitrogen fertilizer suppressed the N2O emission, improved the CO2 emission, and increased NO3--N content; combined other carbon sources and nitrate nitrogen fertilizer promoted the N2O and CO2 emission. |
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