| 覃小凤,刘芯蕊,刘超奇,赵华,张艳霞,张金波,朱启林,但小倩,汤水荣,伍延正,孟磊.不同水分管理条件下添加水铁矿对稻田N2O排放的影响[J].农业环境科学学报,2025,44(10):2709-2719. |
| 不同水分管理条件下添加水铁矿对稻田N2O排放的影响 |
| Effects of ferrihydrite addition on N2O emissions from paddy field under different water management conditions |
| 投稿时间：2024-12-26 |
| DOI：10.11654/jaes.2024-1150 |
| 中文关键词: 干湿交替灌溉 持续淹水灌溉 水铁矿 N2O |
| 英文关键词: alternate wetting-drying irrigation continuous flooding irrigation ferrihydrite N2O |
| 基金项目:国家自然科学基金项目（42367048，41807044） |
| 作者 | 单位 | E-mail | | 覃小凤 | 海南大学热带农林学院, 海口 570228 | | | 刘芯蕊 | 海南大学热带农林学院, 海口 570228 | | | 刘超奇 | 海南大学热带农林学院, 海口 570228 | | | 赵华 | 海南大学热带农林学院, 海口 570228 | | | 张艳霞 | 海南大学热带农林学院, 海口 570228 | | | 张金波 | 海南大学南繁学院, 海南 三亚 572025 | | | 朱启林 | 海南大学南繁学院, 海南 三亚 572025 | | | 但小倩 | 海南大学南繁学院, 海南 三亚 572025 | | | 汤水荣 | 海南大学南繁学院, 海南 三亚 572025 | | | 伍延正 | 海南大学热带农林学院, 海口 570228 | wyz198712@163.com | | 孟磊 | 海南大学南繁学院, 海南 三亚 572025 | menglei@hainanu.edu.cn |
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| 中文摘要: |
| 水铁矿作为一种土壤改良剂，在减少土壤N2O排放方面潜力巨大，因此，本研究通过室内培养试验，探讨不同水分管理条件下水铁矿对海南当地典型水稻土 N2O排放的影响，设置干湿交替灌溉对照（AWD-CK）、干湿交替灌溉+0.5%水铁矿（AWDFH）、持续淹水灌溉对照（CF-CK）、持续淹水灌溉+0.5%水铁矿（CF-FH）4个处理。结果表明：干湿交替灌溉环境下N2O排放量高于持续淹水灌溉，添加水铁矿可显著减少N2O排放量，其中干湿交替灌溉环境中降低31.21%，淹水条件中降低58.33%。同等水分条件下，添加水铁矿显著减少了NO-3-N含量。干湿交替灌溉环境下添加水铁矿使得微生物生物量氮（MBN）显著提高了26.23%。干湿交替灌溉环境添加水铁矿使4-甲基伞形酮磷酸酯酶（PHOS）活性显著升高25.47%，N-乙酰基-β-D-氨基葡萄糖苷酶（NAG）活性和亮氨酸氨基肽酶（LAP）活性显著降低 36.38%和 18.69%。持续淹水灌溉环境下添加水铁矿对 PHOS、NAG没有显著影响，β-1，4-葡萄糖苷酶（BG）活性提高了28.75%，LAP活性降低了44.56%。添加水铁矿后，N2O排放量与土壤有机质、速效钾、pH、铵态氮、硝态氮及土壤胞外酶呈正相关，与微生物生物量氮呈负相关，说明土壤中碳、氮、磷、钾与微生物共同调控N2O产生。研究表明，添加水铁矿对热带地区稻田土壤中减少N2O排放及氮素损失具有一定作用。 |
| 英文摘要: |
| As a soil amendment, ferrihydrite has great potential to reduce soil N2O emissions. Therefore, this study explored the effects of ferrihydrite on N2O emissions from paddy soils in Hainan under different water management conditions through laboratory incubation experiments. The treatments were as follows：alternate wetting-drying irrigation control（AWD-CK）, alternate wetting-drying irrigation + 0.5% ferrihydrite（AWD-FH）, continuous flooding irrigation control（CF-CK）, continuous flooding irrigation+0.5% ferrihydrite（CF-FH）. The results showed that：N2O emissions under alternate wetting and drying irrigation were higher than those under continuous flooding irrigation. The addition of ferrihydrite could significantly reduce N2O emissions, which was reduced by 31.21% in the alternate wetting and drying irrigation environment and 58.33% in the flooding condition. Under the same water conditions, the addition of ferrihydrite significantly reduced NO-3-N content. The addition of ferrihydrite significantly increased microbial biomass nitrogen（MBN）by 26.23%. The addition of ferrihydrite significantly promoted the activity of 4-methylumbelliferone phosphatase（PHOS）by 25.47%, inhibited the activity of N-acetyl-β-D-glucosaminidase（NAG）by 36.38% and the activity of leucine aminopeptidase（LAP）by 18.69%, which was beneficial to reduce nitrification and denitrification substrates and reduce N2O emissions. Under the condition of continuous flooding irrigation, the addition of ferrihydrite had no significant effect on PHOS and NAG, the activity of β-1, 4-glucosidase（BG）increased by 28.75%, and the activity of LAP decreased by 44.56%. After the addition of ferrihydrite, N2O emissions showed positive correlations with soil organic matter, available potassium, pH, ammonium nitrogen, nitrate nitrogen, and soil extracellular enzymes, while exhibiting a negative correlation with biomass nitrogen. This indicates that carbon, nitrogen, phosphorus, potassium, and microorganisms in soil collectively regulate the generation of N2O. In conclusion, the addition of ferrihydrite demonstrates potential in mitigating N2O emissions and reducing nitrogen loss in tropical paddy soils. |
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