河口湿地化能自养固碳和铁结合有机碳对盐度与氮含量变化的响应

doi:10.13292/j.1000-4890.202606.031

生态学杂志 ›› 2026, Vol. 45 ›› Issue (6): 1983-1992.doi: 10.13292/j.1000-4890.202606.031

河口湿地化能自养固碳和铁结合有机碳对盐度与氮含量变化的响应

吴博双¹,杜光月¹,宋振阳¹,漆梦婷²,潘一凡¹,李小飞^1,2,3*

（¹华东师范大学河口海岸全国重点实验室，上海 200241； ²华东师范大学地理科学学院地理信息科学教育部重点实验室，上海 200241； ³华东师范大学重庆研究院精密光学重庆市重点实验室，重庆 401120）

出版日期:2026-06-10 发布日期:2026-12-01

Response of chemoautotrophic carbon fixation and iron-bound organic carbon to the changes in salinity and nitrogen concentrations in estuarine sediments.

WU Boshuang¹, DU Guangyue¹, SONG Zhenyang¹, QI Mengting², PAN Yifan¹, LI Xiaofei^1,2,3*

(¹State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China; ²Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China; ³Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing 401120, China).

Online:2026-06-10 Published:2026-12-01

摘要/Abstract

摘要： 河口湿地化能自养固碳（CCF）和铁结合有机碳（Fe-OC）是固碳增汇的重要过程。为揭示CCF和Fe-OC对盐度与氮含量变化的响应特征，本研究以长江口崇明东滩湿地为对象，通过室内培养实验设置梯度条件：盐度（2‰、5‰、10‰、15‰）与硝态氮浓度（20、50、100 μmol·L^-1），研究CCF速率和Fe-OC含量变化，并分析其与碳组分的相互关系。结果显示，CCF速率随着盐度升高显著降低，平均速率减少了6.72 ng C·g^-1·d^-1，Fe-OC含量随着盐度增加而降低，其占总有机碳含量的比例（Fe-OC）从30%降低到22%。CCF速率和Fe-OC含量也随硝态氮含量增加而增加，分别达到19.3 ng C·g^-1·d^-1和3.77 mg·g^-1。CCF与Fe-OC具有显著正相关关系，表明化能过程可促进铁结合有机碳形成。盐度和硝态氮增加促进有机碳分解，从而减少有机碳含量和稳定性。因此，河口湿地盐度和氮含量波动变化会影响固碳增汇过程和有机质组成，进而改变有机碳的稳定性。

关键词: 化能自养固碳, 铁结合有机碳, 盐度, 氮, 长江口

Abstract: Chemoautotrophic carbon fixation (CCF) and iron-bound organic carbon (Fe-OC) in estuarine wetlands are important processes of carbon sequestration and carbon sink enhancement. We investigated changes in CCF rates and Fe-OC concentrations and their correlations with carbon fractions in Chongming Dongtan wetland in Yangtze Estuary, with the responses of CCF and Fe-OC to changes in salinity and nitrogen concentration being assessed in an incubation experiment of salinity gradient (2‰, 5‰, 10‰, and 15‰) and nitrate concentrations (20, 50, and 100 μmol NO₃^-·L^-1). The results showed that CCF rates decreased with increasing salinity by 6.72 ng C·g^-1·d^-1. Fe-OC concentrations decreased with increasing salinity, with the proportion (Fe-OC) of Fe-OC in the total organic carbon concentration being decreased from 30% to 22%. CCF rates and Fe-OC concentrations increased with increasing nitrate concentrations, with CCF rate of 19.3 ng C·g^-1·d^-1 and Fe-OC concentration of 3.77 mg·g^-1, respectively. CCF was significantly positively correlated with Fe-OC, indicating that chemoautotrophic process can favor Fe-OC formation. The enhanced salinity and nitrogen concentrations facilitated organic carbon decomposition, further decreasing the concentrations and stability of organic carbon. Our results suggested that changes in salinity and nitrogen concentrations in estuarine wetlands have great effects on carbon sequestration and carbon sink enhancement process and organic matter composition, further altering the stability of organic carbon.

Key words: chemoautotrophic carbon fixation, iron-bound organic carbon, salinity, nitrogen, Yangtze Estuary

吴博双, 杜光月, 宋振阳, 漆梦婷, 潘一凡, 李小飞. 河口湿地化能自养固碳和铁结合有机碳对盐度与氮含量变化的响应[J]. 生态学杂志, 2026, 45(6): 1983-1992.

WU Boshuang, DU Guangyue, SONG Zhenyang, QI Mengting, PAN Yifan, LI Xiaofei. Response of chemoautotrophic carbon fixation and iron-bound organic carbon to the changes in salinity and nitrogen concentrations in estuarine sediments.[J]. Chinese Journal of Ecology, 2026, 45(6): 1983-1992.

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河口湿地化能自养固碳和铁结合有机碳对盐度与氮含量变化的响应

Response of chemoautotrophic carbon fixation and iron-bound organic carbon to the changes in salinity and nitrogen concentrations in estuarine sediments.

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