| 朱冬冬,王艳玲,高磊,张佳敏,刘卓玲,王蕾.磷添加对不同植稻年限红壤性水稻土有机碳矿化特征及增温潜势的影响[J].农业环境科学学报,2026,45(7):1835-1844. |
| 磷添加对不同植稻年限红壤性水稻土有机碳矿化特征及增温潜势的影响 |
| Effects of phosphorus addition on soil organic carbon mineralization characteristics and warming potential in red soil paddy fields with different rice planting histories |
| 投稿时间：2025-08-21 |
| DOI：10.11654/jaes.2025-0785 |
| 中文关键词: 磷 植稻年限 红壤性水稻土 有机碳矿化 全球增温潜势 |
| 英文关键词: phosphorus rice planting years red soil paddy organic carbon mineralization global warming potential |
| 基金项目:国家自然科学基金项目（42477323，42077087） |
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| 摘要点击次数: 149 |
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| 中文摘要: |
| 为阐明磷添加对不同植稻年限稻田土壤有机碳矿化特征及全球增温潜势（GWP）的影响，本研究以江西鹰潭红壤关键带孙家小流域的新垦水田（NP，2~3 a）、新成稻田（YP，20~30 a）和老龄稻田（OP，>200 a）0~15 cm耕层土壤为研究对象，设置0（P0）、22.5 kg·hm-2 （P1）、45.0 kg·hm-2 （P2）、90.0 kg·hm-2 （P3）、113.0 kg·hm-2 （P4）、135.0 kg·hm-2 （P5）共6个磷添加水平，开展室内淹水培养试验。观测CO2和CH4的日均排放量（ADM）与累积排放量（CM），结合一级动力学方程拟合有机碳矿化潜力，分析不同植稻年限红壤性水稻土温室气体排放及GWP对磷添加的响应。结果表明：磷添加显著影响不同植稻年限土壤的碳矿化特征。培养至第13天，新成稻田的ADMCO2-C较第5天显著降低了83.8%~85.3%，之后趋于稳定；磷添加仅显著促进老龄稻田CH4排放，其ADMCH4-C随培养时间延长呈波动上升趋势。一级动力学方程拟合结果表明，P3、P4、P5处理显著提高了稻田土壤CO2潜在矿化量（CO2-C0），其中老龄稻田CH4的潜在矿化量（CH4-C0）增幅最大（168.8%~356.7%）；P4和P5处理使新成稻田CH4-C0分别显著增加42.1%和30.4%，而对新垦水田影响不显著。GWP分析显示，老龄稻田峰值高达522.2 kg·hm-2，为新垦水田和新成稻田峰值的87.0倍和81.6倍。研究表明，植稻年限是调控稻田土壤对磷添加响应的重要因子，长期植稻的老龄稻田在外源磷输入下具有更高的CH4排放潜力与增温风险，亟需实施精准磷肥管理以控制温室气体排放。 |
| 英文摘要: |
| This study aims to elucidate the effects of phosphorus（P）addition on soil organic carbon mineralization characteristics and global warming potential（GWP）in paddy soils with different planting years. Surface soil（0-15 cm）was collected from three paddy fields in the Sunjia small watershed of the Yingtan Red Soil Critical Zone：newly reclaimed paddy fields（NP, 2-3 years）, newly formed paddy fields（YP, 20-30 years）and old paddy fields（OP, >200 years）. A flooded incubation experiment was conducted with six P addition levels： 0（P0）, 22.5 kg·hm-2 （P1）, 45.0 kg·hm-2 （P2）, 90.0 kg·hm-2 （P3）, 113.0 kg·hm-2 （P4）, 135.0 kg·hm-2 （P5）. Daily average mineralization （ADM）and cumulative mineralization（CM）of CO2 and CH4 were measured, and a first-order kinetic model was used to estimate organic carbon mineralization potential. The responses of greenhouse gas emissions and GWP to P addition were systematically analyzed. P addition significantly influenced carbon mineralization characteristics across soils with different planting histories. By day 13 of incubation, the ADMCO2-C in YP decreased significantly by 83.8%-85.3% compared to day 5, and then stabilized. P addition significantly promoted CH4 emissions in OP, where ADMCH4-C showed a fluctuating increase over time. First-order kinetic modeling indicated that P additions（P3, P4 and P5 treatments）significantly increased the potential CO2 mineralization（CO2-C0）in all soils. The highest increase in potential mineralization of CH4（CH4-C0）was observed in OP, with a rise of 168.8%-356.7%. The CH4-C0 in YP also increased significantly by 42.1% and 30.4% under P4 and P5, respectively, whereas no significant effect was found in NP. GWP analysis revealed that OP had the highest GWP（522.2 kg · hm-2）, exceeding that of NP and YP by more than 87.0-fold and 81.6-fold. Therefore, the duration of rice cultivation is an important factor regulating the soil′ s response to phosphorus addition in paddy fields. Aging paddy fields that have been cultivated with rice for a long time exhibit a high potential for CH4 emissions and an increased risk of warming under conditions of exogenous phosphorus addition, highlighting the urgent need to implement precise fertilization management measures to control greenhouse gas emissions. |
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