Moderate nitrogen enrichment increases CO2 sink strength in a coastal wetland

doi:10.1088/1748-9326/ad64e9

	Moderate nitrogen enrichment increases CO2 sink strength in a coastal wetland
	Qu,Wendi 1,2; Han,Guangxuan2,3 ; Penuelas,Josep 4,5; Wang,Xiaoyue 1,2; Xie,Baohua2,3
发表期刊	Environmental Research Letters
	2024-07-26
卷号	19 期号:8
关键词	nitrogen enrichment coastal wetland CO2 sequestration plant species composition biomass distribution
DOI	10.1088/1748-9326/ad64e9
通讯作者	Wang,Xiaoyue() ; Xie,Baohua()
英文摘要	Abstract Coastal wetlands remarkably influence terrestrial carbon (C) stock by serving as natural reservoirs for ‘blue carbon’. Anthropogenic nitrogen (N) enrichment shapes the dynamics of soil and plant communities, consequently affecting the C balance and ecosystem functions. The impacts of various levels of N enrichment on CO2 sequestration in coastal wetlands, however, remain elusive. Here we conducted a long-term field study of N fertilization in a coastal wetland in the Yellow River Delta, China, to investigate N effects on soil properties, indicators of plant dynamics, and fluxes of ecosystem CO2. The results indicated that moderate N enrichment (5 g N m?2 y?1) stimulated C fluxes with increases in gross primary productivity (+26.4%), ecosystem respiration (+23.3%), and net ecosystem exchange (NEE, +31.5%) relative to the control. High (10 g N m?2 y?1) and extreme (20 g N m?2 y?1) amounts of N enrichment, however, had relatively minor impacts on these CO2 fluxes. Overall, we observed a decrease in soil electrical conductivity (?24.6%) and increases in soil organic C (+25.2%) and microbial biomass C (+369.3%) for N enrichment. N enrichment also altered the composition of plant species, with a higher proportion of a local dominant species (Phragmites australis), and affected root biomass distribution, with more biomass near the soil surface. Structural equation modeling explained 65.2% of the variance of NEE and supported the assumption that N enrichment could alter the dynamics of soil properties and plant conditions and accelerate ecosystem CO2 sequestration. These findings have important implications for forecasting the C cycle with increasing N deposition in coastal wetlands, contributing to the projections of the global C budget.
语种	英语
WOS记录号	IOP:erl_19_8_084044
引用统计
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/35753
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
通讯作者	Wang,Xiaoyue; Xie,Baohua
作者单位	1.The Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China 2.University of the Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 3.Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264000, People’s Republic of China 4.CREAF, Centre de Recerca Ecol`ogica i Aplicacions Forestals, Cerdanyola del Vall`es, Barcelona 08193, Catalonia, Spain 5.CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Barcelona 08193, Catalonia, Spain
推荐引用方式 GB/T 7714	Qu,Wendi,Han,Guangxuan,Penuelas,Josep,et al. Moderate nitrogen enrichment increases CO2 sink strength in a coastal wetland[J]. Environmental Research Letters,2024,19(8).
APA	Qu,Wendi,Han,Guangxuan,Penuelas,Josep,Wang,Xiaoyue,&Xie,Baohua.(2024).Moderate nitrogen enrichment increases CO2 sink strength in a coastal wetland.Environmental Research Letters,19(8).
MLA	Qu,Wendi,et al."Moderate nitrogen enrichment increases CO2 sink strength in a coastal wetland".Environmental Research Letters 19.8(2024).