Nitrogen Fertilization Enhances Soil Organic Carbon Accumulation by Improving Photosynthetic C Assimilation and Root Exudation Efficiency in a Salt Marsh

doi:10.2139/ssrn.4537625

	Nitrogen Fertilization Enhances Soil Organic Carbon Accumulation by Improving Photosynthetic C Assimilation and Root Exudation Efficiency in a Salt Marsh
	Li, Juanyong 1; Chen, Yawen 3; Ge, Tida 4; Zhao, Mingliang 2,5,6; Ge, Jiaxin 2,7; Han, Guangxuan2,5,6,8
发表期刊	SSRN
ISSN	15565068
	2023
关键词	Budget control Chlorine compounds Ecosystems Loading Nitrogen Nitrogen fertilizers Organic carbon Wetlands
DOI	10.2139/ssrn.4537625
英文摘要	Although salt marshes cover only a small area of the Earth, their contribution to long term carbon (C) burial is comparable to C sinks in many more dominant terrestrial ecosystem types. Continuous nitrogen (N) loading alters plant growth and subsequently has the potential to impact soil organic carbon (SOC) accumulation in salt marshes. However, there is presently little information concerning the input and allocation of photosynthesized C in plant-soil-microbial systems. This knowledge gap 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 five hour 13C-pulse labeling experiment in a salt marsh dominated by Suaeda. salsa (S. salsa) in the Yellow River Delta, China. N fertilization increased net 13C assimilation of S. Salsa by 177.37%, 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 0N (0 g N m-2 yr-1) and +N (20 g N m-2 yr-1) group. The results suggest that SOC increase under N fertilization was mainly due to an increased C assimilation rate and more efficient downward transfer of photosynthesized C instead of root lysate and detritus. In addition, N fertilization strongly improved the 13C amounts in the chloroform-labile SOC component by 315%. 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. © 2023, The Authors. All rights reserved.
收录类别	EI
语种	英语
EI主题词	Budget control ; Chlorine compounds ; Ecosystems ; Loading ; Nitrogen ; Nitrogen fertilizers ; Organic carbon ; Wetlands
EI入藏号	20230279648
引用统计
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/34306
专题	中国科学院海岸带环境过程与生态修复重点实验室中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室支撑部门_中国科学院黄河三角洲滨海湿地试验站
作者单位	1.School of Advanced Interdisciplinary Studies, Hunan University of Technology and Business, Changsha; 410205, China; 2.Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai; 264000, China; 3.Jiangyou China Sciences Miantou Environmental Technology Co., Ltd, Beijing China Sciences Runyu Environmental Protection Technology Co.,Ltd, Mianyang; 621000, China; 4.State Key Laboratory for Managing Biotic and Chemical Threats, The Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo; 315211, China; 5.University of Chinese Academy of Sciences, Beijing; 100049, China; 6.Yellow River Delta Field Observation and Research Station of Coastal Wetland Ecosystem, Chinese Academy of Sciences, China; 7.School of resources and environmental engineering, Ludong University, Yantai; 264025, China; 8.CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Shandong, Yantai; 264003, China
推荐引用方式 GB/T 7714	Li, Juanyong,Chen, Yawen,Ge, Tida,et al. Nitrogen Fertilization Enhances Soil Organic Carbon Accumulation by Improving Photosynthetic C Assimilation and Root Exudation Efficiency in a Salt Marsh[J]. SSRN,2023.
APA	Li, Juanyong,Chen, Yawen,Ge, Tida,Zhao, Mingliang,Ge, Jiaxin,&Han, Guangxuan.(2023).Nitrogen Fertilization Enhances Soil Organic Carbon Accumulation by Improving Photosynthetic C Assimilation and Root Exudation Efficiency in a Salt Marsh.SSRN.
MLA	Li, Juanyong,et al."Nitrogen Fertilization Enhances Soil Organic Carbon Accumulation by Improving Photosynthetic C Assimilation and Root Exudation Efficiency in a Salt Marsh".SSRN (2023).