Snow cover and soil moisture controls of freeze–thaw-related soil gas fluxes from a typical semi-arid grassland soil: a laboratory experiment

Wu, Xing; Brüggemann, Nicolas; Butterbach‐Bahl, Klaus; Fu, Bojie; Li, Guohua

doi:10.1007/s00374-013-0853-z

Cited by 34 publications

(32 citation statements)

References 41 publications

(101 reference statements)

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“…In general, alpine meadow soils in the Qinghai-Tibet Plateau are CH 4 sinks (Jiang et al 2010). After the frozen soils thawed, the rate at which the soils absorbed CH 4 increased quickly, consistent with previous studies (Dörsch et al 2004;Wu et al 2014). The increase in CH 4 uptake after thawing is primarily due to the fact that CH 4 , which diffuses from the atmosphere into the soils, was oxidized by the reactivated CH 4 -oxidizing bacteria, so that the negative emissions increased compared with those during freezing (Hütsch 1998).…”

Section: Discussionsupporting

confidence: 79%

Release of Carbon and Nitrogen from Alpine Soils During Thawing Periods in the Eastern Qinghai-Tibet Plateau

Gao

Zeng

Xie

et al. 2015

Water Air Soil Pollut

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Soil thawing can affect the turnover of soil carbon (C) and nitrogen (N) and their release into the atmosphere. However, little has been known about the release of C and N during the thawing of alpine soils in the Qinghai-Tibet Plateau. This study investigated the effects of soil thawing on the release of CO 2 , CH 4 , and N 2 O from alpine peatland soils and alpine meadow soils through an indoor experiment and determined the changes in the dissolved organic C (DOC), dissolved organic N (DON), NO 3 − -N, NH 4 + -N, and NO 2 − -N concentrations in the soils after soil thawing. The freezethaw treatments were performed by incubating the soil columns at mild (−5°C) and severe (−15°C) for 14 days, and then at 5°C for 18 days. The control columns were incubated at 5°C. During thawing, the cumulative CO 2 emissions from the severely frozen alpine peatland soils and alpine meadow soils were 36 and 85 % higher than those from the control soils, and the cumulative N 2 O emissions were 3.9 and 5.8 times higher than those from the control soils. However, the thawing after mild freezing produced no significant effects. The two freezing temperatures significantly increased the release of CH 4 from the alpine peatland soils, but the thawing of the severely frozen soils reduced the CH 4 uptake of the alpine meadow soils by 27 %. After the severely frozen alpine peatland soils thawed, the concentrations of DOC, DON, NO 3 − -N, NH 4 + -N, and NO 2 − -N increased significantly, but NO 2 − -N showed no significant changes for the alpine meadow soils. After thawing with mild freezing, DOC in the alpine peatland soils and NH 4 + -N, NO 2 − -N, and DOC in the alpine meadow soils showed no significant changes. This study indicates that the potential for release of C and N from alpine soils during thawing periods strongly depends on the freezing temperature and soil types.

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Section: Discussionsupporting

confidence: 79%

Release of Carbon and Nitrogen from Alpine Soils During Thawing Periods in the Eastern Qinghai-Tibet Plateau

Gao

Zeng

Xie

et al. 2015

Water Air Soil Pollut

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“…This could lead to inverted soil temperature patterns in winter, that is, to ‘colder soils in a warmer world’, due to reduced soil insulation of snowpack and to increased frequency of freeze–thaw cycles (Groffman et al ., ). Such freeze–thaw cycles have been shown to be biogeochemical key periods with, for example, pulses of nutrient leaching or emission of the potent greenhouse gas nitrous oxide (N 2 O) (Matzner & Borken, ; Wolf et al ., ; Wu et al ., ). Unteregelsbacher et al .…”

Section: Introductionmentioning

confidence: 97%

Climate change amplifies gross nitrogen turnover in montane grasslands of Central Europe in both summer and winter seasons

Wang

Chen

Unteregelsbacher

et al. 2016

Global Change Biology

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The carbon- and nitrogen-rich soils of montane grasslands are exposed to above-average warming and to altered precipitation patterns as a result of global change. To investigate the consequences of climatic change for soil nitrogen turnover, we translocated intact plant-soil mesocosms along an elevational gradient, resulting in an increase of the mean annual temperature by approx. 2 °C while decreasing precipitation from approx. 1500 to 1000 mm. Following three years of equilibration, we monitored the dynamics of gross nitrogen turnover and ammonia-oxidizing bacteria (AOB) and archaea (AOA) in soils over an entire year. Gross nitrogen turnover and gene levels of AOB and AOA showed pronounced seasonal dynamics. Both summer and winter periods equally contributed to cumulative annual N turnover. However, highest gross N turnover and abundance of ammonia oxidizers were observed in frozen soil of the climate change site, likely due to physical liberation of organic substrates and their rapid turnover in the unfrozen soil water film. This effect was not observed at the control site, where soil freezing did not occur due to a significant insulating snowpack. Climate change conditions accelerated gross nitrogen mineralization by 250% on average. Increased N mineralization significantly stimulated gross nitrification by AOB rather than by AOA. However, climate change impacts were restricted to the 2-6 cm topsoil and rarely occurred at 12-16 cm depth, where generally much lower N turnover was observed. Our study shows that significant mineralization pulses occur under changing climate, which is likely to result in soil organic matter losses with their associated negative impacts on key soil functions. We also show that N cycling processes in frozen soil can be hot moments for N turnover and thus are of paramount importance for understanding seasonal patterns, annual sum of N turnover and possible climate change feedbacks.

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“…Wetting dry soil can stimulate atmospheric CH 4 oxidation in unsaturated upland soils mainly by alleviating osmotic stress on soil methanotrophs2324, but the effect of the availability of soil C and N upon wetting on soil CH 4 oxidation is not known. Wu et al 25. reported that there was a significant increase in the CH 4 uptake activity following thawing and this increase generally decreased by increasing soil moisture from 32 to 55% WFPS.…”

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confidence: 99%

Synergistic effects of dissolved organic carbon and inorganic nitrogen on methane uptake in forest soils without and with freezing treatment

Duan

et al. 2016

Sci Rep

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There is limited knowledge about how the interaction of dissolved organic carbon (DOC) and inorganic nitrogen (N) released into the soil just after freezing can affect methane (CH4) uptake in forest soils. Here, we present how freezing treatment and glucose, as a DOC source, can affect the roles of NH4+-N and NO3−-N in inhibiting soil CH4 uptake, by using soil-core incubation experiments. A long-term freezing at low temperature reduced cumulative CH4 uptake in the soils sampled from two temperate forest stands without carbon (C) and N addition. The inhibition effects of N addition as NH4Cl and KNO3 on the soil CH4 uptake were much larger than C addition. Freezing treatment eliminated the inhibition effect of NH4Cl and KNO3 addition on CH4 uptake, and this response was affected by glucose addition and forest types. The addition of glucose eliminated the inhibition effect of NO3−-N on CH4 uptake in the forest soils without and with freezing treatment, while the addition of NH4+-N and glucose inhibited synergistically the soil CH4 uptake. The results highlight the importance of synergistic effects of DOC and N inputs on the soil CH4 uptake under forest stands during soil wetting and thawing periods.

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Snow cover and soil moisture controls of freeze–thaw-related soil gas fluxes from a typical semi-arid grassland soil: a laboratory experiment

Cited by 34 publications

References 41 publications

Release of Carbon and Nitrogen from Alpine Soils During Thawing Periods in the Eastern Qinghai-Tibet Plateau

Release of Carbon and Nitrogen from Alpine Soils During Thawing Periods in the Eastern Qinghai-Tibet Plateau

Climate change amplifies gross nitrogen turnover in montane grasslands of Central Europe in both summer and winter seasons

Synergistic effects of dissolved organic carbon and inorganic nitrogen on methane uptake in forest soils without and with freezing treatment

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