| 赵光昕,刘杏认,张晴雯,田秀平.施用生物炭对农田土壤N2O的减排效应[J].农业环境科学学报,2018,37(12):2872-2880. |
| 施用生物炭对农田土壤N2O的减排效应 |
| Effect of biochar on N2O emissions from agricultural soil |
| 投稿时间：2018-05-28 |
| DOI：10.11654/jaes.2018-0699 |
| 中文关键词: 生物炭 氧化亚氮 硝态氮 铵态氮 |
| 英文关键词: biochar N2O nitrate nitrogen ammonium nitrogen |
| 基金项目:国家自然科学基金项目（41773090，31300375）；国家水体污染控制与治理科技重大专项（2015ZX07203-007） |
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| 摘要点击次数: 1900 |
| 全文下载次数: 1877 |
| 中文摘要: |
| 生物炭作为一种土壤改良剂，在农田土壤氮素转化和温室气体减排等方面发挥着重要作用。本实验对不同施氮量的农田土壤添加生物炭，研究了其对N2O的减排潜力，为生物炭的固氮减排提供理论依据。于2015年6月18日至9月25日，利用盆栽实验研究了施用生物炭对农田土壤在不同氮肥用量下N2O排放的影响，实验共设4个处理：对照（CK）为不施氮处理、N1（200 kg·hm-2）、N2（400 kg·hm-2）和N3（600 kg·hm-2），各处理均施用土壤质量15%（W/W）的等量生物炭。结果表明，随着施氮量的增加，土壤N2O的累积排放量逐渐增加，N2和N3处理差异不显著，N2O排放系数逐渐降低，N1、N2、N3的排放系数分别为1.33%、1.27%、0.90%。Pearson相关分析表明，土壤孔隙含水量（WFPS）、土壤pH、土壤NO3--N和土壤微生物量氮（MBN）含量是影响N2O排放最主要的因素，其中土壤WFPS、土壤NO3--N和MBN含量与N2O排放通量之间呈极显著的正相关关系，土壤pH与N2O排放通量之间呈极显著负相关关系。生物炭的施用对农田土壤N2O具有巨大的减排潜力，并且生物炭与氮肥配施对土壤氮素有很好的固持作用。 |
| 英文摘要: |
| As a soil amendment, biochar plays an important role in soil N transformation and reducing greenhouse gas emissions. The purpose of the experiment is to study the N2O emission reduction potential under different N rates with biochar addition, and to provide a theoretical basis for the reduction potential of biochar. A pot experiment was conducted from June 18 to September 25 in year 2015, and the effects of biochar on N2O emissions under different N levels in farmland soil were studied. The experiment consisted of four treatments with three replicates. The treatments were CK (non-N application), N1 (200 kg·hm-2), N2 (400 kg·hm-2), and N3 (600 kg·hm-2). A biochar amount of 15% (W/W) of the pot soil was applied to each treatment. The results showed that the cumulative N2O emissions increased with N rates. There was no significant difference between N2 and N3. The emission factors (EFs) of N1, N2, and N3 were 1.33%, 1.27%, and 0.90%, respectively, and the EFs decreased with increasing N rate. The correlation analysis showed that N2O fluxes were significantly positively correlated with soil water-filled porosity (WFPS), soil NO3--N content, and soil microbial biomass nitrogen (MBN) (P<0.01), and that N2O fluxes were significantly negatively correlated with soil pH (P<0.01). The addition of biochar has great potential to reduce N gas loss. The combined application of biochar and N fertilizer has a good retention effect on soil N. |
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