Effects of elevated atmospheric CO 2 and nitrogen fertilization on nitrogen cycling in experimental riparian wetlands

Liu, Jun; Appiah-Sefah, Gloria; Apreku, Theresa Oteng

doi:10.1016/j.wse.2017.05.005

Cited by 9 publications

(8 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Less information is available regarding the “relationships of the rise in atmospheric CO 2 concentration with N and P concentrations and N:P ratio in soil.” Huang et al () observed that a rise in atmospheric CO 2 concentration did not change total soil P concentrations but increased P‐available to plants and decreased more recalcitrant soil‐P. Increased CO 2 concentrations can indirectly decrease soil N and P concentrations by several mechanisms including higher plant N and P demands, higher N and P resorption rates, and higher exudates production and N and P uptake (Jin, Tang, & Sale, ; Liu, Appiah‐Sefah, & Apreku, ; Van Vuuren et al, ). However, the potential impact of CO 2 enhancement of soil N:P ratios also remains inconclusive.…”

Section: Shifts In N:p Ratios Mediated By Anthropogenic Drivers Of Glmentioning

confidence: 99%

“…“Anthropogenic land‐use changes” are heterogeneous, but they tend to be associated with changes in soil N and P concentrations and N:P ratios (Liu et al, ; Urbina, Grau, Sardans, Ninot, & Penuelas, ; Wang et al, ; Zhao et al, ; Zhou, Boutton, & Wu, , ). For example, invasion by shrubs on grassland previously grazed by livestock is frequently associated with changes in soil–plant N and P concentrations and N:P ratios (Bui & Henderson, ; Urbina et al, ).…”

Section: Shifts In N:p Ratios Mediated By Anthropogenic Drivers Of Glmentioning

confidence: 99%

See 1 more Smart Citation

Anthropogenic global shifts in biospheric N and P concentrations and ratios and their impacts on biodiversity, ecosystem productivity, food security, and human health

Peñuelas

Janssens

Ciais

et al. 2020

Global Change Biology

170

119

View full text Add to dashboard Cite

The availability of carbon (C) from high levels of atmospheric carbon dioxide (CO2) and anthropogenic release of nitrogen (N) is increasing, but these increases are not paralleled by increases in levels of phosphorus (P). The current unstoppable changes in the stoichiometries of C and N relative to P have no historical precedent. We describe changes in P and N fluxes over the last five decades that have led to asymmetrical increases in P and N inputs to the biosphere. We identified widespread and rapid changes in N:P ratios in air, soil, water, and organisms and important consequences to the structure, function, and biodiversity of ecosystems. A mass‐balance approach found that the combined limited availability of P and N was likely to reduce C storage by natural ecosystems during the remainder of the 21st Century, and projected crop yields of the Millennium Ecosystem Assessment indicated an increase in nutrient deficiency in developing regions if access to P fertilizer is limited. Imbalances of the N:P ratio would likely negatively affect human health, food security, and global economic and geopolitical stability, with feedbacks and synergistic effects on drivers of global environmental change, such as increasing levels of CO2, climatic warming, and increasing pollution. We summarize potential solutions for avoiding the negative impacts of global imbalances of N:P ratios on the environment, biodiversity, climate change, food security, and human health.

show abstract

Section: Shifts In N:p Ratios Mediated By Anthropogenic Drivers Of Glmentioning

confidence: 99%

Section: Shifts In N:p Ratios Mediated By Anthropogenic Drivers Of Glmentioning

confidence: 99%

Anthropogenic global shifts in biospheric N and P concentrations and ratios and their impacts on biodiversity, ecosystem productivity, food security, and human health

Peñuelas

Janssens

Ciais

et al. 2020

Global Change Biology

170

119

View full text Add to dashboard Cite

show abstract

“…Elevated atmospheric CO 2 may affect soil microorganisms indirectly through affecting root growth, rhizodeposition rate, and litter composition (rogers et al, 1994;Paterson et al, 1997). Several studies have found that CO 2 induced changes in plant tissue composition (cha et al, 2017;VolDer et al, 2015;liu et al, 2018) causing changes in the composition of rhizosphere and soil microbial activity; and hence, impacting C turnover and storage in soil (BarnarD et al, 2005;muller et al, 2009;runion et al, 2009;cha et al, 2017). Increasing CO 2 may increase the availability of labile C through exudation (cheng, 1999) enhancing C f lux from plants to soil (Diaz et al, 1993;curtis at al., 1994), which may, in turn, stimulate soil microbial processes such as mineralization (Baggs et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Soil organic C is also considered the dominant storage sink in grassland and cropland as it holds about half of the C stored in the forests. Effects of rising atmospheric CO 2 on belowground processes; particularly, soil N and C has been receiving increased attention in the past two decades and substantial changes in C dynamics and the global C cycle have been noticed and reported as studies have shown that elevated CO 2 concentration stimulate photosynthesis and hence, increase net primary productivity of the plant and fine roots (king et al, 2001;norBy et al, 2004;Finzi et al, 2007;DiJkstra et al, 2008;liu et al, 2018;martens et al, 2020) causing an increase in the amount of C stored in trees and soil (Follett, 1993;FranzlueBBers et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

The effect of long-term CO₂ enrichment on carbon and nitrogen content of roots and soil of natural pastureland

2021

View full text Add to dashboard Cite

Increasing levels of atmospheric CO2 may change C and N dynamics in pasture ecosystems. The present study was conducted to examine the impact of four years of CO2 enrichment on soil and root composition and soil N transformation in natural pastureland. Plots of open-top growth chambers were continuously injected with ambient CO2 (350 µL L–1) and elevated CO2 (625 µL L–1). Soil cores exposed to ambient and elevated CO2 treatment were incubated and collected each year. Net N-mineralization rates in soil (NH4 +-N plus NO3ˉ–-N), in addition to total C and N content (%) of soil and root tissues were measured. Results revealed that elevated CO2 caused a significant reduction in soil NO3 (P < 0.05), however, no significant CO2 effect was found on total soil C and N content (%). Roots of plants grown under elevated CO2 treatment had higher C/N ratios. Changes in root C/N ratios were driven by changes in root N concentrations as total root N content (%) was significantly reduced by 30% (P < 0.05). Overall, findings suggest that the effects of CO2 enrichment was more noticeable on N content (%) than C content (%) of soil and roots; elevated CO2 significantly affected soil N-mineralization and total N content (%) in roots, however, no substantial change was found in C inputs in CO2-enriched soil.

show abstract

“…Carbon dioxide (CO 2 ) is the most important greenhouse gas, which has increased by around 2 ppm of the current rate per year. Enriched atmospheric CO 2 concentration can both enhance and improve soil microorganism activities through plant photosynthesis, organic substrate quantity, organism's respiration, and microbial biomass allocation in the ecosystem (Liu et al 2018). There are many considerable interests in understanding whether the elevated atmospheric CO 2 can regulate the carbon sequestration and nitrogen mineralization in soil, and how these changes respond to the ecological environment (Yu and Chen 2019).…”

Section: Introductionmentioning

confidence: 99%

Elevated atmospheric CO2 impact on carbon and nitrogen transformations and microbial community in replicated wetland

et al. 2020

View full text Add to dashboard Cite

Background Elevated atmospheric CO2 has direct and indirect influences on ecosystem processes. The impact of elevated atmospheric CO2 concentration on carbon and nitrogen transformations, together with the microbial community, was evaluated with water hyacinth (Eichhornia crassipes) in an open-top chamber replicated wetland. The responses of nitrogen and carbon pools in water and wetland soil, and microbial community abundance were studied under ambient CO2 and elevated CO2 (ambient + 200 μL L−1). Results Total biomass for the whole plant under elevated CO2 increased by an average of 8% (p = 0.022). Wetlands, with water hyacinth, showed a significant increase in total carbon and total organic carbon in water by 7% (p = 0.001) and 21% (p = 0.001), respectively, under elevated CO2 compared to that of ambient CO2. Increase in dissolved carbon in water correlates with the presence of wetland plants since the water hyacinth can directly exchange CO2 from the atmosphere to water by the upper epidermis of leaves. Also, the enrichment CO2 showed an increase in total carbon and total organic carbon concentration in wetland soil by 3% (p = 0.344) and 6% (p = 0.008), respectively. The total nitrogen content in water increased by 26% (p = 0.0001), while total nitrogen in wetland soil pool under CO2 enrichment decreased by 9% (p = 0.011) due to increased soil microbial community abundance, extracted by phospholipid fatty acids, which was 25% larger in amount than that of the ambient treatment. Conclusion The study revealed that the elevated CO2 would affect the carbon and nitrogen transformations in wetland plant, water, and soil pool and increase soil microbial community abundance.

show abstract

Effects of elevated atmospheric CO 2 and nitrogen fertilization on nitrogen cycling in experimental riparian wetlands

Cited by 9 publications

References 27 publications

Anthropogenic global shifts in biospheric N and P concentrations and ratios and their impacts on biodiversity, ecosystem productivity, food security, and human health

Anthropogenic global shifts in biospheric N and P concentrations and ratios and their impacts on biodiversity, ecosystem productivity, food security, and human health

The effect of long-term CO₂ enrichment on carbon and nitrogen content of roots and soil of natural pastureland

Elevated atmospheric CO2 impact on carbon and nitrogen transformations and microbial community in replicated wetland

Contact Info

Product

Resources

About

Effects of elevated atmospheric CO 2 and nitrogen fertilization on nitrogen cycling in experimental riparian wetlands

Cited by 9 publications

References 27 publications

Anthropogenic global shifts in biospheric N and P concentrations and ratios and their impacts on biodiversity, ecosystem productivity, food security, and human health

Anthropogenic global shifts in biospheric N and P concentrations and ratios and their impacts on biodiversity, ecosystem productivity, food security, and human health

The effect of long-term CO2 enrichment on carbon and nitrogen content of roots and soil of natural pastureland

Elevated atmospheric CO2 impact on carbon and nitrogen transformations and microbial community in replicated wetland

Contact Info

Product

Resources

About

The effect of long-term CO₂ enrichment on carbon and nitrogen content of roots and soil of natural pastureland