Moderate nitrogen enrichment increases CO 2 sink strength in a coastal wetland
Bibliographic Data
| ID | 15549660 |
|---|---|
| Authors | Wendi Qu (0000-0002-2326-9243, Chinese Academy of Sciences), Guangxuan Han (Chinese Academy of Sciences), Josep Peñuelas (0000-0002-7215-0150, Centre for Research on Ecology and Forestry Applications), Xiaoyue Wang (0009-0006-8146-5118, Chinese Academy of Sciences, corresponding author), Baohua Xie (0000-0003-3822-9305, Chinese Academy of Sciences, corresponding author) |
| Year | 2024 |
| Volume | 19 |
| Issue | 8 |
| Pages | 084044-084044 |
| Publication date | 2024-07-18 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Environmental Research Letters (JOURNAL) |
| Journal identifiers | ISSN: 1748-9326 • E-ISSN: 1748-9326 |
| Publisher | IOP Publishing (PUBLISHER • GB) |
| DOI | 10.1088/1748-9326/ad64e9 |
| OpenAlex | W4400763293 |
| Language | EN |
| References cited | 46 |
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 CO 2 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 CO 2 . 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 CO 2 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 CO 2 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
Biology · Geography · Geotechnical engineering · Hydrology (agriculture · Nitrogen · Sink (geography · Wetland · Chemistry · Coastal wetland ecosystem dynamics · Environmental Science · Peatlands and Wetlands Ecology · Ecology · Geology
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| Citation velocity | historical |
|---|---|
| Highly cited | No |