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中科院南京土壤所Nature Geoscience最新研究成果!

  • 2026-03-30 23:18:34
中科院南京土壤所Nature Geoscience最新研究成果!

SCI期刊Nature Geoscience

英文题目:Reduced phosphorus bioavailability in rice paddies intensified by elevated CO2-driven warming
中文题目CO2与增温降低稻田磷有效性
发表时间:2026年2月3日
文章链接Wang, Y., Chen, H., Su, W. et al. Reduced phosphorus bioavailability in rice paddies intensified by elevated CO2-driven warming. Nat. Geosci. (2026). https://doi.org/10.1038/s41561-026-01917-2
摘要:
大气CO₂浓度升高会通过促进土壤有机磷累积与作物收获移除,降低水稻土的磷(P)有效性。大气CO₂与温度同步上升,但二者对土壤磷循环的交互作用机制仍不明确。
本研究依托典型稻-旱轮作系统,开展了长达十年的开放式大气CO₂浓度升高(FACE)与原位增温(+2℃)耦合试验。结果表明,CO₂浓度升高与增温均会加剧土壤磷限制,且单独增温、以及增温与高CO₂协同作用的影响,均显著强于单独CO₂浓度升高。所有气候变化处理均使土壤有效磷大幅耗竭(降幅32%~54%),土壤碳磷比(C:P)显著升高(增幅4%~30%)。此外,增温虽在初期加速磷矿化,但会通过强化铁-有机碳复合物形成与微生物固持作用,最终降低磷有效性;而CO₂浓度升高通过促进作物生长提升其磷需求,上述过程共同加剧了土壤磷耗竭。
本研究证实,铁-有机碳互作是此前被忽视、可显著降低磷生物有效性的关键机制。研究结果构建了地上-地下碳磷耦合与微生物驱动的铁-有机质动态关联的理论框架,强调未来气候变化背景下,亟需制定适应性养分管理策略,以保障水稻生产的可持续性。
 一、研究引言
在气候变化背景下,大气二氧化碳浓度升高(eCO2)及其诱导的全球变暖对陆地生态系统的养分循环产生了深远影响。水稻作为全球核心粮食作物,其产量的稳定性高度依赖于土壤养分的供应。磷(P)是限制植物生长的关键大量元素之一,在淹水稻田环境中,磷的有效性受氧化还原电位、pH值及微生物活动的复杂调控。虽然前人研究探讨了单一气候因子对磷循环的影响,但_eCO2与增温共同作用下,水稻土磷有效性的动态响应及其背后的多维调控机制尚不明确
针对研究空白提出了以下核心问题:在长期eCO2和变暖的交互作用下,稻田土壤中的生物有效磷(Bioavailable Phosphorus)含量如何变化?土壤理化性质(如Eh、pH)的变化如何通过非生物途径影响磷的赋存状态?负责磷转化功能的微生物群落(如含有phoD和pqqC基因的类群)在群落结构和功能潜能上发生了哪些关键演变,进而影响磷的生物循环?
二、研究方法
本研究的逻辑构建遵循了从“现象观测”到“机制解析”再到“系统整合”的科学路径。首先,作者依托于长期FACE实验平台,设置了环境对照(Ambient)、二氧化碳升高(eCO2)、增温(Temp)以及两者并存(eCO2+Temp)四个处理。这种析因实验设计是生态学研究中评估多因子交互作用的标准范式。
在非生物环境表征方面,研究重点监测了稻田的关键指标:pH值和氧化还原电位(Eh)。通过原位电极测量,作者获取了分蘖期、抽穗期和灌浆期等关键物候期的动态数据。
三、研究结果
本文通过长达数年的FACE(大气CO2浓度增高实验)观测发现,eCO2和变暖的叠加效应显著降低了水稻土中磷的生物有效性。

图 1:水稻籽粒与土壤中碳、氮、磷含量及化学计量比的时间与气候变异

二氧化碳升高与增温共同导致了土壤氧化还原电位(Eh)的显著下降这种更强的还原环境促进了磷与铁氧化物的结合或沉淀,减少了有效磷的释放。

图 2:多年尺度下气候条件对作物及土壤磷动态的影响

气候变化显著改变了参与磷循环的微生物群落结构。介导有机磷矿化的phoD基因和介导无机磷溶解的pqqC基因的丰度及多样性在复杂气候处理下有所下降,直接削弱了微生物驱动的养分周转能力。

图 3:气候对铁结合态有机碳及土壤磷的影响

 综合路径分析表明,非生物因子(尤其是Eh)的变动是导致有效磷下降的主导因素,而微生物功能的退化则起到了关键的负反馈作用,两者协同强化了磷受限的程度。

图 4:CO₂浓度升高与增温背景下作物–土壤–微生物互作调控磷循环的概念模型

END

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  1. CONNECT:[ UseTime:0.000726s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001105s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000303s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000292s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000783s ]
  6. SELECT * FROM `set` [ RunTime:0.000222s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000672s ]
  8. SELECT * FROM `article` WHERE `id` = 483843 LIMIT 1 [ RunTime:0.000391s ]
  9. UPDATE `article` SET `lasttime` = 1775352901 WHERE `id` = 483843 [ RunTime:0.000740s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000274s ]
  11. SELECT * FROM `article` WHERE `id` < 483843 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000517s ]
  12. SELECT * FROM `article` WHERE `id` > 483843 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000667s ]
  13. SELECT * FROM `article` WHERE `id` < 483843 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001012s ]
  14. SELECT * FROM `article` WHERE `id` < 483843 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001667s ]
  15. SELECT * FROM `article` WHERE `id` < 483843 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001191s ]
0.098462s