| 宋贺,潘广元,陈清,曹文超,王敬国.中国北方设施菜田垄-畦土壤N2O和NO年排放特征比较[J].农业环境科学学报,2014,33(12):2472-2477. |
| 中国北方设施菜田垄-畦土壤N2O和NO年排放特征比较 |
| Comparison of N2O and NO Emissions from Ridged and Furrowed Soils in a Greenhouse in Northern China |
| 投稿时间：2014-05-15 |
| DOI：10.11654/jaes.2014.12.027 |
| 中文关键词: 设施菜田 痕量气体 N2O排放 NO排放 |
| 英文关键词: greenhouse vegetable cropping system trace gases N2O emission NO emission |
| 基金项目:国家自然科学基金(41301258,41230856,31371566);安徽省自然科学基金(1408085QC68) |
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| 中文摘要: |
| 为弄清设施菜田垄上和畦上土壤的N2O和NO排放特征,准确估算我国设施菜田痕量气体年排放量,依靠一个田间原位试验,用静态暗箱-气相色谱法和氮氧化物分析仪分别监测了一年设施菜田垄上及畦上土壤的N2O和NO排放通量.研究结果表明畦上和垄上N2O和NO年排放量差异显著.畦上和垄上N2O累积年排放分别为11.60、4.23 kg N·hm-2,NO的累积年排放分别为1.27、0.43 kg N·hm-2;考虑到畦垄面积比为3:1,修正后设施菜田N2O和NO累积年排放分别为9.65、1.06 kg N·hm-2.因此在气体取样时,取样点在畦上,会分别高估N2O和NO年排放量1.95 kg N·hm-2和0.21 kg N·hm-2.垄上CO2的排放量远低于畦上,间接说明垄上土壤缺乏碳源可能是氮素反硝化的限制因子,施用有机肥时应适当远离垄,以免增大氮素损失.此外,垄是重要无机氮汇,估算氮素平衡和硝酸盐淋洗时,应该给予足够重视. |
| 英文摘要: |
| In greenhouse vegetable cropping systems, elevated N fertilizer inputs may increase N2O and NO emissions from soils. Here N2O and NO emissions from ridged and furrowed soils in a greenhouse were monitored to obtain accurate estimates of annual emissions of trace gases from Chinese greenhouse soils. The results showed that N2O and NO emissions were significantly different between ridged and furrowed soils. Annual N2O emissions were 11.60 and 4.23 kg N·hm-2 and annual NO emissions 1.27 and 0.43 kg N·hm-2, from furrowed and ridged soils, respectively. Taking the ratio of furrow to ridge area(3:1) into account, corrected annual emissions of N2O and NO were 9.65和1.06 kg N·hm-2, respectively. If sampled in furrowed soils, the annual emissions of soil N2O and NO would be overestimated at 1.95 kg N·hm-2 and 0.21 NO kg N·hm-2. The CO2 emissions from ridged soils were far lower than from furrowed soils, implying that C resource might be the factor limiting denitrification. Therefore, manure should be applied away from the ridge to prevent N losses. In addition, ridge soils as a sink of inorganic N should not be ignored when estimating N budgets and nitrate leaching in greenhouse vegetable cropping systems. |
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