Greenhouse Gas Emissions Under Different Drainage and Flooding Regimes of Cultivated Peatlands

Hu, Jing; VanZomeren, Christine M.; Inglett, Kanika S.; Wright, Alan L.; Clark, Mark W.; Reddy, K. R.

doi:10.1002/2017jg004010

Cited by 20 publications

(29 citation statements)

References 81 publications

(122 reference statements)

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“…The estimated CO 2 annual emissions from EAA soils exposed to constantly drained conditions in this study (298 g CO 2 –C m −2 yr −1 ) are similar to previous estimates of oxidation from drained EAA peats obtained using soil cores in a laboratory setting (219 g CO 2 –C m −2 yr −1 ) (Hu et al., 2017) and to the estimates of soil cores from Everglades mangrove peats (∼278 g CO 2 –C m −2 yr −1 ) (Chambers et al., 2014). In our study, vegetation was excluded with the intention of estimating oxidation only from the decomposition of the organic matter present in the soil.…”

Section: Discussionsupporting

confidence: 89%

“…Short-term flooding increases CO 2 concentrations in the soil subsurface upon flooding and increases surface CO 2 flux upon drainage (Jarecke et al, 2016). Other studies in EAA peats with longer flooding periods (14-28 d), such as Hu et al (2017) and Jennewein (2017), found that flood cycles either reduced or did not influence CO 2 emissions compared with drained soils. Our results are similar to Miller et al (2012), who found higher CO 2 efflux in EAA peats exposed to cycles of 1 wk flooded followed by 2 wk drained compared with constantly drained soils.…”

Section: Co 2 Emissionsmentioning

confidence: 92%

“…This study was conducted in the Everglades Research and Education Center at the University of Florida located in Belle Glade, FL. The annual precipitation of the study site is 130 cm, and the average annual temperature is 24 °C (Hu et al., 2017). The wet season for south Florida (mean monthly rainfall of 176 mm) is between May and October, and the dry season (mean monthly rainfall of 58 mm) is between November and April (Wetzel et al., 2005).…”

Section: Methodsmentioning

confidence: 99%

“…Hu et al. (2017) found that cumulative CO 2 emissions were negatively correlated with the number of days EAA peats were flooded.…”

Section: Introductionmentioning

confidence: 99%

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Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

Rodrı́guez

Daroub

Gerber

et al. 2021

Soil Science Soc of Amer J

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Soil subsidence of peatlands occurs worldwide due to drainage. The Everglades Agricultural Area (EAA), located in South Florida, has been drained for agriculture since 1914, with subsidence resulting in shallow soils in certain areas. The purpose of this study is to determine the impact of water management strategies on soil oxidation and N release as affected by differences in proximity to the bedrock. Oxidation rates (CO 2 efflux), as well as CH 4 and N 2 O emissions, were measured in lysimeters filled with shallow and deep peat subjected to four water treatments. Additionally, NO 3 -N, NH 4 -N, soluble organic N, and dissolved organic C were measured in leachate obtained from the collected soils. Average annual emissions from constantly drained soils were 298 g CO 2 -C m -2 yr -1 , with most of the oxidation taking place between June and October. Short flood cycles increased annual oxidation rates compared with constantly drained soils, which had the second highest oxidation rate. Constantly flooded soils had the lowest annual oxidation rates, followed by summer flooded soils. Total N lost in leachate was highest for constantly drained soils, with NO 3 being the dominant form. The deep soils had higher losses of soluble N and C, whereas NO 3 losses from shallow soils were higher. Soil oxidation rates did not differ depending on proximity to the bedrock. We conclude that strategies that avoid short flooding cycles and include crop rotations that allow flooding during summer can reduce oxidation and N losses in leachate from EAA peats.

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Section: Discussionsupporting

confidence: 89%

Section: Co 2 Emissionsmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

“…Hu et al. (2017) found that cumulative CO 2 emissions were negatively correlated with the number of days EAA peats were flooded.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

Rodrı́guez

Daroub

Gerber

et al. 2021

Soil Science Soc of Amer J

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“…The rates of denitrification in soils exhibit a high degree of variability because of variation in environmental factors, including soil water content, temperature, bioavailable organic carbon (C), NO 3 ‐ , pH, soil texture and redox potential (Bouwman et al, 2013; Hu, Inglett, Clark, Inglett, & Ramesh Reddy, 2015; Hu, Inglett, Wright, & Reddy, 2016; Hu et al., 2017; Liao, Inglett, & Inglett, 2013; Saggar et al., 2013). These factors interact with each other and hierarchically regulate denitrification rates in soils.…”

Section: Introductionmentioning

confidence: 99%

Nitrous oxide dynamics during denitrification along a hydrological gradient of subtropical grasslands

Inglett

Wright

et al. 2020

Soil Use and Management

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Nitrous oxide (N 2 O) dynamics during denitrification, including N 2 O production and reduction, particularly as related to soil depth, are poorly understood. The objective of this study was to investigate the rates of N 2 O production and reduction processes at various soil depths along a hydrological gradient in grazed subtropical grasslands. A batch incubation study was conducted on soils collected along a hydrological gradient representing isolated wetland (Center), transient edge (Edge) and pasture upland (Upland) in south-central Florida. Significantly different N 2 O production and reduction rates between hydrological zones were observed for surface soils (0-10 cm) under ambient conditions, with average N 2 O production rates of 0.368, 0.178 and 0.003 N 2 ON kg −1 dry soil h −1 for Center, Edge and Upland, respectively, and average N 2 O reduction rates of 0.063, 0.132 and 0.002 N 2 ON kg −1 dry soil h −1. Nitrous oxide production and reduction in subsurface soils maintained low rates and showed small variations between depths and hydrological zones. Our results suggest that N 2 O dynamics were affected by depth, mainly through labile organic carbon (C) and microbial biomass C, being influenced by hydrological zone primarily through soil NO 3 content. The spatial distribution of N 2 O fluxes from denitrification along the hydrological gradient is likely attributed to the differences in N 2 O production and reduction in surface soils.

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Contributions of plant breeding to soil carbon storage: Retrospect and prospects

et al. 2023

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There is interest in harnessing cropland C storage potential at a large scale to mitigate climate change and improve land productivity. While the effects of soil management practices on C storage have been studied extensively, opportunities to select for C sequestration traits in crop plants remain largely unexplored. This review describes how genetic improvement of major US crops may have altered soil C stocks historically and identifies potential opportunities for plant breeding to increase cropland C stocks. Through quantitative literature review, we find that breeding has led to an increase in aboveground residue C inputs to the soil for corn (Zea mays L.) and soybeans (Glycine max (L.) Merr) and a decrease in aboveground residue C inputs for wheat (Triticum aestivum L. and Triticum turgidum L.). Breeding has largely not altered the root:shoot ratio of these crops. Given that there is limited potential for further major improvements in harvest index, breeding for high grain yields may necessitate increasing aboveground biomass and residue production in the future.Crop root traits and residue quality may influence the stabilization of crop-derived C in soil, but there is uncertainty regarding historical changes in these traits due to breeding, the magnitude of their effect on soil organic C stocks, and tradeoffs or synergies with breeding for high yield. Nevertheless, root traits such as suberin content, rhizodeposition, mycorrhizal association, and depth emerge as potential targets for more efficient C stabilization. There is also a large opportunity for plant breeding to enhance the performance of cover crops, double crops, perennial grains, and perennial groundcovers, which can increase annual C inputs to the soil by occupying fallow periods. Our review reveals that there are many opportunities for plant genetic improvement to fix more C in cropping systems and enhance its stabilization in the soil to meet the goals of sustainable intensification and cropland C capture.

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Greenhouse Gas Emissions Under Different Drainage and Flooding Regimes of Cultivated Peatlands

Cited by 20 publications

References 81 publications

Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

Nitrous oxide dynamics during denitrification along a hydrological gradient of subtropical grasslands

Contributions of plant breeding to soil carbon storage: Retrospect and prospects

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