| 王小淇,蒋春兰,孟龙威,李凯凯,伍延正,朱启林,孟磊.生物炭配施硝化抑制剂对热区稻菜轮作土壤N2O排放的影响[J].农业环境科学学报,2025,44(6):1667-1674. |
| 生物炭配施硝化抑制剂对热区稻菜轮作土壤N2O排放的影响 |
| Effects of combined application of biochar and nitrification inhibitor on N2O emission from tropical rice-vegetable rotation soils in Hainan region |
| 投稿时间：2024-07-01 |
| DOI：10.11654/jaes.2024-0548 |
| 中文关键词: 生物质炭 硝化抑制剂 N2O排放 热带 稻菜轮作 |
| 英文关键词: biochar nitrification inhibitor N2O emissions tropical rice-vegetable rotation system |
| 基金项目:国家自然科学基金项目（42367048，41771340）；海南省自然科学基金高层次人才项目（320RC493） |
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| 中文摘要: |
| 为阐明生物质炭和硝化抑制剂对海南稻菜轮作土壤N2O排放的影响及机制，本文设置不添加生物质炭及硝化抑制剂（CK）、添加2%生物质炭（B）、2%生物质炭分别配施硝化抑制剂双氰胺（BD，添加量为纯氮量的5%）和3，4二甲基吡唑磷酸盐（BP，添加量为纯氮量的1%），及生物质炭同时配施1/2的双氰胺和3，4二甲基吡唑磷酸盐（BDP）处理，每个处理分别模拟蔬菜种植环境[60%土壤持水量（WHC）]及水稻生长的淹水环境进行培养。结果显示，添加生物质炭各水分条件下均显著提高了土壤有机碳和总氮含量。相比CK，不同水分条件下添加生物质炭均显著促进了土壤微生物量碳和微生物量氮的含量；但相比B处理，生物质炭配施硝化抑制剂后，土壤微生物量碳含量显著降低。60% WHC条件下，添加生物质炭显著增加了土壤pH，且生物质炭配施硝化抑制剂后，土壤pH进一步提高。与CK相比，60% WHC条件下生物质炭添加显著促进了土壤N2O累积排放。BD处理土壤N2O累积排放量显著低于CK与B处理；而BP和BDP处理土壤累积N2O排放显著高于CK，但相比B处理显著降低。淹水条件下，相比CK，B处理显著促进了土壤N2O排放；而生物质炭配施硝化抑制剂处理均显著降低了土壤N2O累积排放量。研究表明，海南稻菜轮作土壤添加生物质炭在短期内会促进土壤N2O排放，旱地条件下配施双氰胺可有效降低土壤N2O排放量，淹水条件下配施双氰胺和3，4二甲基吡唑磷酸盐均可有效降低土壤N2O排放量，且以二者同时施用但用量减半效果最佳。 |
| 英文摘要: |
| To elucidate the impacts and mechanisms of biochar and nitrification inhibitors on N2O emission from rice-vegetable rotation soils in Hainan. The experiment set up without biochar and nitrification inhibitor treatments（CK）, adding 2% biochar（B）, 2% biochar combined with nitrification inhibitor dicyandiamide（DCD; BD, addition amount is 5% of pure nitrogen）and 3, 4-dimethylpyrazole phosphate（DMPP; BP, addition amount is 1% of pure nitrogen）, and combined with 1/2 of DCD and DMPP（BDP）. Each treatment set to the flooding environment and 60% soil water capacity（WHC）, respectively. Biochar added significantly increased the soil organic carbon（SOC）contents and total nitrogen（TN）under different water conditions. Biochar addition significantly increased the contents of soil microbial biomass carbon（MBC）and microbial nitrogen（MBN）under different water conditions compared with CK. However, compared with B treatment, the MBC content decreased significantly of biochar combined with nitrification inhibitor treatments. Under 60%WHC condition, the biochar addition significantly increased soil pH, and the combination of biochar and nitrification inhibitor further increased soil pH. Compared with CK, biochar addition significantly promoted soil N2O cumulative emission at 60%WHC. The cumulative soil N2O emission of in BD was significantly lower than that in CK and B treatments. The cumulative soil N2O emission in BP and BDP was significantly higher than that in CK, but significantly lower than that in B treatment. Under flooding condition, B treatment significantly promoted soil N2O emission compared with CK, and biochar addition combined with nitrification inhibitors significantly reduced the cumulative N2O emission. adding biochar to rice-vegetable rotation soil can promote soil N2O emission in the short term. Applying DCD can effectively reduce soil N2O emissions in dryland conditions, and applying DCD and DMPP under flooded conditions can significantly reduce soil N2O emissions, with the best effect when both are applied but the dosage is halved. |
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