李龙燚, 魏征, 李谊慈, 等. 长期稻鱼共作对土壤养分循环及碳库稳定性的影响[J]. 华南农业大学学报, 2024, 45(0): 1-8. DOI: 10.7671/j.issn.1001-411X.202405021
    引用本文: 李龙燚, 魏征, 李谊慈, 等. 长期稻鱼共作对土壤养分循环及碳库稳定性的影响[J]. 华南农业大学学报, 2024, 45(0): 1-8. DOI: 10.7671/j.issn.1001-411X.202405021
    LI Longyi, WEI Zheng, LI Yici, et al. Effects of long-term rice-fish co-cropping on soil stoichiometric ratio and stability of organic carbon pool[J]. Journal of South China Agricultural University, 2024, 45(0): 1-8. DOI: 10.7671/j.issn.1001-411X.202405021
    Citation: LI Longyi, WEI Zheng, LI Yici, et al. Effects of long-term rice-fish co-cropping on soil stoichiometric ratio and stability of organic carbon pool[J]. Journal of South China Agricultural University, 2024, 45(0): 1-8. DOI: 10.7671/j.issn.1001-411X.202405021

    长期稻鱼共作对土壤养分循环及碳库稳定性的影响

    Effects of long-term rice-fish co-cropping on soil stoichiometric ratio and stability of organic carbon pool

    • 摘要:
      目的 研究长期低投入稻鱼共作模式下有机碳库和化学计量比的变化,深入解析稻鱼模式的碳库变化,提升稻鱼模式生态功能。
      方法 本研究以湖南传统稻鱼共作代表县——辰溪县的长期低投入稻鱼共作系统为研究对象,分析共作15年(FR15)和50年(FR50)稻鱼模式下的养分储量变化,探讨关键影响因子。
      结果 较之水稻单作(MR),FR15的有机碳、全氮、全磷、硝态氮、铵态氮、速效磷含量,有机碳储量、氮储量、磷储量,易氧化有机碳含量及其在有机碳中的占比均显著降低;C∶N、pH、颗粒有机碳含量、颗粒有机碳占比、矿质结合态有机碳占比、碳库活度和碳库活度指数分别显著增加47.98%、13.15%、35.47%、72.24%、31.68%、58.07%和58.07%。FR50的全氮含量、C∶P、N∶P、硝态氮含量分别显著增加13.13%、33.08%、14.31%和51.52%,全磷含量、容重、有机碳储量、磷储量、易氧化有机碳含量、矿质结合态有机碳含量、矿质结合态有机碳占比均显著降低。
      结论 低投入的稻鱼模式系统虽然会导致养分流失,但自我维持时间的延长会使系统具备养分储量自我恢复的功能。研究结果为优化稻鱼共作模式提供了理论依据,有助于提升该模式的生态功能和可持续性。

       

      Abstract:
      Objective This study aims to investigate the changes in the organic carbon pool and stoichiometric ratios under a long-term low-input rice-fish co-culture system, deeply analyze the carbon pool dynamics in the rice-fish system, and enhance its ecological functions.
      Method The study focused on the long-term low-input rice-fish co-culture system in Chenxi County, a representative county of traditional rice-fish co-culture in Hunan, China. The changes in nutrient storage within the rice-fish co-culture systems, which have been in operation for 15 years (FR15) and 50 years (FR50), were analyzed by our study, and the key influencing factors were explored.
      Result Compared to monoculture rice (MR), FR15 showed significant reductions in soil organic carbon/total nitrogen/total phosphorus/nitrate nitrogen/ammonium nitrogen/available phosphorus contents, organic carbon storage/nitrogen storage/phosphorus storage, readily oxidized organic carbon content and its proportion in organic carbon. The C∶N, pH, particulate organic carbon content and proportion, mineral-associated organic carbon proportion, carbon pool activity, and carbon pool activity index increased significantly by 47.98%, 13.15%, 35.47%, 72.24%, 31.68%, 58.07%, and 58.07%, respectively. FR50 experienced significant increases in total nitrogen content, C∶P, N∶P, and nitrate nitrogen content by 13.13%, 33.08%, 14.31%, and 51.52%, respectively, while total phosphorus content, volume weight, organic carbon storage, phosphorus storage, readily oxidized organic carbon content, mineral-associated organic carbon content and proportion decreased significantly.
      Conclusion Although the low-input rice-fish co-culture system may lead to nutrient loss, the extended self-maintenance of the system enables it to recover nutrient storage autonomously. The findings provide a theoretical basis for optimizing the rice-fish co-culture system, which could help enhance its ecological functions and sustainability.

       

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