The role of soil moisture, temperature and nutrient amendment on CO2 efflux from agricultural peat soil microcosms

Kechavarzi, Cédric; Dawson, Q.; Bartlett, Mark D.; Leeds‐Harrison, P. B.

doi:10.1016/j.geoderma.2009.02.018

Cited by 80 publications

(53 citation statements)

References 44 publications

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“…They also indicate that soils of our study sites were characteristic of European fens and resembled typical properties of managed organic soils (Berglund, 1995;Kechavarzi et al, 2010;Eickenscheidt et al, 2015;Krueger et al, 2015;Wüst-Galley et al, 2016;Brouns et al, 2016). Several studies assume that deeper layer peat of managed organic soils is less decomposed (Ewing and Vepraskas, 2006;Rogiers et al, 2008;Leifeld et al, 2011a, b;Krueger et al, 2015;Wüst-Galley et al, 2016).…”

Section: Som Characteristicssupporting

confidence: 70%

Peat decomposability in managed organic soils in relation to land use, organic matter composition and temperature

et al. 2018

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Abstract. Organic soils comprise a large yet fragile carbon (C) store in the global C cycle. Drainage, necessary for agriculture and forestry, triggers rapid decomposition of soil organic matter (SOM), typically increasing in the order forest < grassland < cropland. However, there is also large variation in decomposition due to differences in hydrological conditions, climate and specific management. Here we studied the role of SOM composition on peat decomposability in a variety of differently managed drained organic soils. We collected a total of 560 samples from 21 organic cropland, grassland and forest soils in Switzerland, monitored their CO 2 emission rates in lab incubation experiments over 6 months at two temperatures (10 and 20 • C) and related them to various soil characteristics, including bulk density, pH, soil organic carbon (SOC) content and elemental ratios (C / N, H / C and O / C). CO 2 release ranged from 6 to 195 mg CO 2 -C g −1 SOC at 10 • C and from 12 to 423 mg g −1 at 20 • C. This variation occurring under controlled conditions suggests that besides soil water regime, weather and management, SOM composition may be an underestimated factor that determines CO 2 fluxes measured in field experiments. However, correlations between the investigated chemical SOM characteristics and CO 2 emissions were weak. The latter also did not show a dependence on land-use type, although peat under forest was decomposed the least. High CO 2 emissions in some topsoils were probably related to the accrual of labile crop residues. A comparison with published CO 2 rates from incubated mineral soils indicated no difference in SOM decomposability between these soil classes, suggesting that accumulation of recent, labile plant materials that presumably account for most of the evolved CO 2 is not systematically different between mineral and organic soils. In our data set, temperature sensitivity of decomposition (Q 10 on average 2.57 ± 0.05) was the same for all land uses but lowest below 60 cm in croplands and grasslands. This, in turn, indicates a relative accumulation of recalcitrant peat in topsoils.

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Section: Som Characteristicssupporting

confidence: 70%

Peat decomposability in managed organic soils in relation to land use, organic matter composition and temperature

et al. 2018

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“…This assumption is justified by the numerous studies that documented the dependence of fitted C 0 and k on physical conditions such as temperature and water-filled porosity (Linn and Doran, 1984;Kechavarzi et al, 2010a). Under isothermal conditions (which covers most laboratory experiment) the total mineralized C over a period of t ¼ T can be related to water-filled porosity and air-filled porosity as…”

Section: Environmental Controls On Mineralizationmentioning

confidence: 99%

Decomposition of distinct organic matter pools is regulated by moisture status in structured wetland soils

Arnold

Ghezzehei

Berhe

2015

Soil Biology and Biochemistry

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“…CO 2 emissions have also been reported to decline as volumetric water content decreases [7]. Higher moisture content has been associated with greater CO 2 emissions in agricultural peatlands [8]. A close relationship also exists between water tables and CH 4 emissions, which typically decreases during drying events [2,4,9].…”

Section: Introductionmentioning

confidence: 99%

Short-Term Effects of Drying and Rewetting on CO2 and CH4 Emissions from High-Altitude Peatlands on the Tibetan Plateau

Zeng

Gao

2016

Atmosphere

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This study used mesocosms to examine the effects of alternate drying and rewetting on CO 2 and CH 4 emissions from high-altitude peatlands on the Tibetan Plateau. The drying and rewetting experiment conducted in this study included three phases: a 10-day predrying phase, a 32-day drying phase, and an 18-day rewetting phase. During the experiment, the water table varied between 0 and 50 cm with respect to the reference peat column where the water table stayed constant at 0 cm. The study found that drying and rewetting had no significant effect on CO 2 emissions from the peatland, while CH 4 emissions decreased. The cumulative CH 4 emissions in the control group was 2.1 times higher than in the drying and rewetting treatment over the study period. Moreover, CO 2 and CH 4 emissions were positively correlated with soil temperature, and the drying process increased the goodness of fit of the regression models predicting the relationships between CO 2 and CH 4 emissions and temperature. These results indicate that small-scale water table variation has a limited effect on CO 2 emissions, but might reduce CH 4 emissions in high-altitude peatlands on the Tibetan Plateau.

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The role of soil moisture, temperature and nutrient amendment on CO2 efflux from agricultural peat soil microcosms

Cited by 80 publications

References 44 publications

Peat decomposability in managed organic soils in relation to land use, organic matter composition and temperature

Peat decomposability in managed organic soils in relation to land use, organic matter composition and temperature

Decomposition of distinct organic matter pools is regulated by moisture status in structured wetland soils

Short-Term Effects of Drying and Rewetting on CO2 and CH4 Emissions from High-Altitude Peatlands on the Tibetan Plateau

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