Nitrogen fertilization enhances organic carbon accumulation in topsoil mainly by improving photosynthetic C assimilation in a salt marsh

doi:10.1016/j.jenvman.2023.119862

	Nitrogen fertilization enhances organic carbon accumulation in topsoil mainly by improving photosynthetic C assimilation in a salt marsh
	Li, Juanyong 1; Chen, Yawen 3; Ge, Tida 4; Zhao, Mingliang 2,5,6,7; Ge, Jiaxin 2,8; Han, Guangxuan 2,5,6,7,9
刊名	JOURNAL OF ENVIRONMENTAL MANAGEMENT
	2024-02-01
卷号	351 页码:10
关键词	Photosynthetic carbon allocation Salt marshes 13C-CO2 pulse labeling Rhizodeposition Nitrogen fertilization
ISSN号	0301-4797
DOI	10.1016/j.jenvman.2023.119862
通讯作者	Han, Guangxuan(gxhan@yic.ac.cn)
英文摘要	Continuous nitrogen (N) loading alters plant growth and subsequently has the potential to impact soil organic carbon (SOC) accumulation in salt marshes. However, the knowledge gap of photosynthesized carbon (C) allocation in plant-soil-microbial systems hampers the quantification of C fluxes and the clarification of the mechanisms controlling the C budget under N loading in salt marsh ecosystems. To address this, we conducted an N fertilization field observation combined with a 5 h 13C-pulse labeling experiment in a salt marsh dominated by Suaeda. salsa (S. salsa) in the Yellow River Delta (YRD), China. N fertilization increased net 13C assimilation of S. Salsa by 277.97%, which was primarily allocated to aboveground biomass and SOC. However, N fertilization had little effect on 13C allocation to belowground biomass. Correlation analysis showed that 13C incorporation in soil was significantly and linearly correlated with 13C incorporation in shoots rather than in roots both in a 0 N (0 g N m-2 yr-1) and +N (20 g N m- 2 yr-1) group. The results suggested that SOC increase under N fertilization was mainly due to an increased C assimilation rate and more efficient downward transfer of photosynthesized C. In addition, N fertilization strongly improved the 13C amounts in the chloroform-labile SOC component by 295.26%. However, the absolute increment of newly fix 13C mainly existed in the form of residual SOC, which had more tendency for burial in the soil. Thus, N fertilization enhanced SOC accumulation although C loss increased via belowground respiration. These results have important implications for predicting the carbon budget under further human-induced N loading.
WOS关键词	SOIL ; PLANT ; RHIZODEPOSITION ; ALLOCATION ; ROOT ; AVAILABILITY ; INPUT ; RICE
WOS研究方向	Environmental Sciences & Ecology
语种	英语
WOS记录号	WOS:001146198600001
资助机构	National Natural Science Foundation of China ; Scientific Research Fund of Hunan Provincial Education Department ; Hunan Technology and Business University ; Yellow River Delta Ecological Research Station of Coastal Wetland, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.yic.ac.cn/handle/133337/34829]
专题	中国科学院烟台海岸带研究所
通讯作者	Han, Guangxuan
作者单位	1.Hunan Univ Technol & Business, Sch Adv Interdisciplinary Studies, Changsha 410205, Peoples R China 2.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Zone Environm Proc & Ecol Remediat, Yantai 264000, Peoples R China 3.Beijing China Sci Runyu Environm Protect Technol C, Jiangyou China Sci Miantou Environm Technol Co Ltd, Mianyang 621000, Peoples R China 4.Ningbo Univ, Inst Plant Virol, State Key Lab Managing Biot & Chem Threats Qual &, Ningbo 315211, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Chinese Acad Sci, Yellow River Delta Field Observat, Beijing, Peoples R China 7.Chinese Acad Sci, Res Stn Coastal Wetland Ecosyst, Beijing, Peoples R China 8.Ludong Univ, Sch Resources & Environm Engn, Yantai 264025, Peoples R China 9.Chinese Acad Sci, Yantai Inst Coastal Zone Res YIC, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Shandong Key Lab Coastal Environm Proc,YICCAS, Yantai 264003, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Li, Juanyong,Chen, Yawen,Ge, Tida,et al. Nitrogen fertilization enhances organic carbon accumulation in topsoil mainly by improving photosynthetic C assimilation in a salt marsh[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2024,351:10.
APA	Li, Juanyong,Chen, Yawen,Ge, Tida,Zhao, Mingliang,Ge, Jiaxin,&Han, Guangxuan.(2024).Nitrogen fertilization enhances organic carbon accumulation in topsoil mainly by improving photosynthetic C assimilation in a salt marsh.JOURNAL OF ENVIRONMENTAL MANAGEMENT,351,10.
MLA	Li, Juanyong,et al."Nitrogen fertilization enhances organic carbon accumulation in topsoil mainly by improving photosynthetic C assimilation in a salt marsh".JOURNAL OF ENVIRONMENTAL MANAGEMENT 351(2024):10.