Effects of water table changes on soil CO2, CH4 and N2O fluxes during the growing season in freshwater marsh of Northeast China

Hou, Cuicui; Song, Changchun; Li, Yingchen; Wang, Jiaoyue; Song, Yajing; Wang, Xianwei

doi:10.1007/s12665-012-2031-2

Cited by 27 publications

(28 citation statements)

References 59 publications

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“…N 2 O emissions following the lowering of the water table from the middle to bottom of the column during the second (short) wetting/drying cycle was about six times higher than the emissions during the first cycle (long saturated conditions, 2 weeks). We attribute this increase to the short duration of saturation that permitted oxygen levels to remain with a favorable range for production and storage of N 2 O (that is subsequently released with lowering the water table) consistent with other laboratory and field observations (Goldberg, Knorr, Blodau, Lischeid, & Gebauer, ; Hou et al., ; Martikainen, Nykanen, Crill, & Silvola, ). Curiously, N 2 O emissions disappeared altogether during the third cycle in which saturated conditions lasted longest (4 weeks).…”

Section: Resultssupporting

confidence: 86%

Dynamics of soil biogeochemical gas emissions shaped by remolded aggregate sizes and carbon configurations under hydration cycles

Ebrahimi

2017

Global Change Biology

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Changes in soil hydration status affect microbial community dynamics and shape key biogeochemical processes. Evidence suggests that local anoxic conditions may persist and support anaerobic microbial activity in soil aggregates (or in similar hot spots) long after the bulk soil becomes aerated. To facilitate systematic studies of interactions among environmental factors with biogeochemical emissions of CO 2 , N 2 O and CH 4 from soil aggregates, we remolded silt soil aggregates to different sizes and incorporated carbon at different configurations (core, mixed, no addition).Assemblies of remolded soil aggregates of three sizes (18, 12, and 6 mm) and equal volumetric proportions were embedded in sand columns at four distinct layers. The water table level in each column varied periodically while obtaining measurements of soil GHG emissions for the different aggregate carbon configurations. Experimental results illustrate that methane production required prolonged inundation and highly anoxic conditions for inducing measurable fluxes. The onset of unsaturated conditions (lowering water table) resulted in a decrease in CH 4 emissions while temporarily increasing N 2 O fluxes. Interestingly, N 2 O fluxes were about 80% higher form aggregates with carbon placement in center (anoxic) core compared to mixed carbon within aggregates. The fluxes of CO 2 were comparable for both scenarios of carbon sources. These experimental results highlight the importance of hydration dynamics in activating different GHG production and affecting various transport mechanisms about 80% of total methane emissions during lowering water table level are attributed to physical storage (rather than production), whereas CO 2 emissions (~80%) are attributed to biological activity. A biophysical model for microbial activity within soil aggregates and profiles provides a means for results interpretation and prediction of trends within natural soils under a wide range of conditions.

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Section: Resultssupporting

confidence: 86%

Dynamics of soil biogeochemical gas emissions shaped by remolded aggregate sizes and carbon configurations under hydration cycles

Ebrahimi

2017

Global Change Biology

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“…In this study, our results indicate that CO 2 was the major contributor (92–98%) to the overall GWP of cumulative GHG emissions, while CH 4 and N 2 O contributed less than 2% and 2–6%, irrespective of hydrologic treatments. This finding is in agreement with Jungkunst and Fiedler () and Morse et al (), even though some studies reported CH 4 from soils with standing water contributed around 90% to the overall GWP (Hou et al, ; Yu et al, ). The overall GWP was negatively correlated to flooding period (Figure d), suggesting that increasing the flooding period of the EAA peatlands could substantially decrease GHG emissions and global warming potential.…”

Section: Discussionsupporting

confidence: 90%

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

VanZomeren

Inglett

et al. 2017

JGR Biogeosciences

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Globally, approximately 10–20% of peatlands have been drained for agricultural purposes. A strategy to protect peatlands and mitigate carbon dioxide (CO2) emissions, while continuing agricultural production, is the use of intermittent flooding and drainage. A potential drawback of this strategy could be increases in methane (CH4) and nitrous oxide (N2O) emissions. The objective of this study was to compare greenhouse gas (GHG) emissions from peatlands under various flooding–drainage cycles. A laboratory study was performed using intact soil cores subjected to different durations of flooding and drainage for 6 months. Average daily emissions of CO2 and N2O were significantly higher (P < 0.001) under drained (667 ± 37 mg CO2–C m−2 d−1 and 135 ± 19 μg N2O–N m−2 d−1) than flooded conditions (86 ± 6 mg CO2–C m−2 d−1 and 48 ± 2 μg N2O–N m−2 d−1). Methane emissions were not influenced by drained/flooded conditions, with an average rate of 116 ± 11 μg CH4–C m−2 d−1. Peaks of CH4 and N2O emissions were observed after flooding events and lasted less than 24 h. The peak emissions were approximately 8 and 19 times higher than the mean CH4 and N2O emissions, respectively. Carbon dioxide was the dominant component of GHGs, irrespective of hydrologic regime, accounting for more than 92% of overall global warming potential. Global warming potential was inversely proportional to the flooding period, indicating that prolonging the flooding period of peatlands would help mitigate soil oxidation and GHG emissions and enhance sustainability of these agricultural peatlands.

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“…7). In-situ experiments in Deyeuxia angustifolia wetlands suggested that water table elevation increase would yield more vegetation biomass, restrict litter decomposition and soil organic matter mineralization (Hou et al, 2013), and promote sedimentation rates . These results imply that water regimes in wetlands have critical impacts on carbon sequestration, and they might outweigh effects of temperature in some instances.…”

Section: Climate Changementioning

confidence: 99%

Regulating effects of climate, net primary productivity, and nitrogen on carbon sequestration rates in temperate wetlands, Northeast China

Zhang

Craft

Xue

et al. 2016

Ecological Indicators

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a b s t r a c tTemperate wetlands in the Northern Hemisphere have high long-term carbon sequestration rates, and play critical roles in mitigating regional and global atmospheric CO 2 increases at the century timescale. We measured soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) from 11 typical freshwater wetlands (Heilongjiang Province) and one saline wetland (Jilin Province) in Northeast China, and estimated carbon sequestration rates using 210 Pb and 137 Cs dating technology. Effects of climate, net primary productivity, and nutrient availability on carbon sequestration rates (R carbon ) were also evaluated. Chronological results showed that surface soil within the 0-40 cm depth formed during the past 70-205 years. Soil accretion rates ranged from 2.20 to 5.83 mm yr −1 , with an average of 3.84 ± 1.25 mm yr −1 (mean ± SD). R carbon ranged from 61.60 to 318.5 gC m −2 yr −1 and was significantly different among wetland types. Average R carbon was 202.7 gC m −2 yr −1 in the freshwater wetlands and 61.6 gC m −2 yr −1 in the saline marsh. About 1.04 × 10 8 tons of carbon was estimated to be captured by temperate wetland soils annually in Heilongjiang Province (in the scope of 45.381-51.085 • N, 125.132-132.324 • E). Correlation analysis showed little impact of net primary productivity (NPP) and soil nutrient contents on R carbon , whereas climate, specifically the combined dynamics of temperature and precipitation, was the predominant factor affecting R carbon . The negative relationship observed between R carbon and annual mean temperature (T) indicates that warming in Northeast China could reduce R carbon . Significant positive relationships were observed between annual precipitation (P), the hydrothermal coefficient (defined as P/AT, where AT was accumulative temperature ≥10 • C), and R carbon , indicating that a cold, humid climate would enhance R carbon . Current climate change in Northeast China, characterized by warming and drought, may form positive feedbacks with R carbon in temperate wetlands and accelerate carbon loss from wetland soils.

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Effects of water table changes on soil CO2, CH4 and N2O fluxes during the growing season in freshwater marsh of Northeast China

Cited by 27 publications

References 59 publications

Dynamics of soil biogeochemical gas emissions shaped by remolded aggregate sizes and carbon configurations under hydration cycles

Dynamics of soil biogeochemical gas emissions shaped by remolded aggregate sizes and carbon configurations under hydration cycles

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

Regulating effects of climate, net primary productivity, and nitrogen on carbon sequestration rates in temperate wetlands, Northeast China

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