Effect of temperature and moisture on soil organic carbon mineralization of predominantly permafrost peatland in the Great Hing'an Mountains, Northeastern China

Wang, Xianwei; Li, Xiuzhen; Hu, Yuanman; Lv, Jiujun; Sun, Ju; Li, Zongmei; Wu, Zhongchen

doi:10.1016/s1001-0742(09)60217-5

Cited by 86 publications

(57 citation statements)

References 34 publications

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“…Nevertheless, the high Ea of the studied samples might reflect the change in chemical peat composition with decomposition after drainage towards higher recalcitrance. In contrast to other studies on unmanaged organic soils reporting no trend or increasing Q 10 values with depth (Scanlon and Moore, 2000; Wang et al, 2010;Hardie et al, 2011;Hilasvuori et al, 2013), the cropland and grassland profiles in our study had a lower Q 10 below the 60 cm depth. Various studies on SOM decomposition used Q 10 values as an indicator of SOM recalcitrance (Hogg et al, 1992;Biasi et al, 2005;Davidson and Janssens, 2006;Conant et al, 2008Conant et al, , 2011Hartley and Ineson, 2008;Hilasvuori et al, 2013).…”

Section: Co 2 Emissions and Temperature Sensitivity Of Decompositioncontrasting

confidence: 99%

“…However, the relationship between CO 2 emissions and depth was rather weak in our case and not consistent for both incubation temperatures and the different land uses. Compared to the studies on unmanaged organic soils, reporting declines of a factor 2 to 30 (Hogg et al, 1992;Scanlon and Moore, 2000;Wang et al, 2010;Hardie et al, 2011), our differences were substantially smaller. Drainage and decadal agricultural use of the studied soils led to more intense decomposition processes in the topsoil, resulting in little depth interaction or, for croplands, sometimes maybe even a reversal of decomposability.…”

Section: Co 2 Emissions and Temperature Sensitivity Of Decompositioncontrasting

confidence: 90%

“…Like other studies on extensively managed or undisturbed organic soils that investigated depth interaction of decomposition rates in the top 30 to 50 cm (Hogg et al, 1992;Scanlon and Moore, 2000;Wang et al, 2010;Hardie et al, 2011), we found a decrease of specific CO 2 release with depth. However, the relationship between CO 2 emissions and depth was rather weak in our case and not consistent for both incubation temperatures and the different land uses.…”

Section: Co 2 Emissions and Temperature Sensitivity Of Decompositionsupporting

confidence: 83%

“…Hogg et al, 1992;Scanlon and Moore, 2000;Wang et al, 2010;Wetterstedt et al, 2010;Hardie et al, 2011), dividing the 10 000 h length of the incubation period at 10 • C by the time span over which samples incubated at 20 • C emitted the same amount of CO 2 -C per mg SOC as those incubated at 10 • C emitted during 10 000 h. Given that the same amount of SOC is lost at both temperatures, changes in OM composition during incubation are also assumed to be the same and thus differences in the rates are assumed to reflect only the influence of temperature and not that of differences in composition. Q 10 values are known to depend on incubation temperatures.…”

Section: Discussionmentioning

confidence: 99%

“…Incubation studies of peat samples and carbon loss studies with undisturbed organic soils found smaller CO 2 emission rates from deeper peat layers, which was related to the absence of labile compounds i.e. a lower intrinsic decomposability of soil organic matter (SOM) (Hogg et al, 1992;Scanlon and Moore, 2000;Wang et al, 2010;Hardie et al, 2011;Leifeld et al, 2012). Using solid-state 13 C-NMR, DRIFT/FTIR spectroscopy and pyrolysis-GC/MS, various studies of OM composition of undisturbed peat profiles have shown a gradual change with increasing depth towards a relative enrichment of compounds that are recalcitrant against decomposition under anoxic conditions, such as lignins and polyphenols (Freeman et al, 2004), while the contents of labile oxygen-rich compounds, such as polysaccharides, were found to decrease (Leifeld et al, 2012;Biester et al, 2014;Sjögersten et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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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: Co 2 Emissions and Temperature Sensitivity Of Decompositioncontrasting

confidence: 99%

Section: Co 2 Emissions and Temperature Sensitivity Of Decompositioncontrasting

confidence: 90%

Section: Co 2 Emissions and Temperature Sensitivity Of Decompositionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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Short and Long‐Term Controls on Active Layer and Permafrost Carbon Turnover Across the Arctic

et al. 2018

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Decomposition of soil organic matter (SOM) in permafrost terrain and the production of greenhouse gases is a key factor for understanding climate change‐carbon feedbacks. Previous studies have shown that SOM decomposition is mostly controlled by soil temperature, soil moisture, and carbon‐nitrogen ratio (C:N). However, focus has generally been on site‐specific processes and little is known about variations in the controls on SOM decomposition across Arctic sites. For assessing SOM decomposition, we retrieved 241 samples from 101 soil profiles across three contrasting Arctic regions and incubated them in the laboratory under aerobic conditions. We assessed soil carbon losses (Closs) five times during a 1 year incubation. The incubated material consisted of near‐surface active layer (ALNS), subsurface active layer (ALSS), peat, and permafrost samples. Samples were analyzed for carbon, nitrogen, water content, δ13C, δ15N, and dry bulk density (DBD). While no significant differences were observed between total ALSS and permafrost Closs over 1 year incubation (2.3 ± 2.4% and 2.5 ± 1.5% Closs, respectively), ALNS samples showed higher Closs (7.9 ± 4.2%). DBD was the best explanatory parameter for active layer Closs across sites. Additionally, results of permafrost samples show that C:N ratio can be used to characterize initial Closs between sites. This data set on the influence of abiotic parameter on microbial SOM decomposition can improve model simulations of Arctic soil CO2 production by providing representative mean values of CO2 production rates and identifying standard parameters or proxies for upscaling potential CO2 production from site to regional scales.

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CO₂ emissions from soils of different depths of a permafrost peatland, Northeast China: response to simulated freezing–thawing cycles

Wang

Song

Hou

et al. 2014

J. Plant Nutr. Soil Sci.

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Soil freezing-thawing cycle (FTC) is an important factor controlling C dynamics in mid-high latitude regions, especially in the permafrost regions impacted by global warming. Nonetheless, the response of C cycling in the deeper active layers of permafrost regions to FTC remains far from certain. We aimed to characterize the emission of CO 2 from soils of multiple depths as impacted by FTC and its relationship with active organic C (OC) and enzyme activities. We collected soil samples from three soil layers (0-15, 15-30, and 30-45 cm) of an undisturbed peatland in the Da Xing'anling Mountains, NE China, and then subjected them to various freezing (10 to -10°C) and thawing (-10 to 10°C) cycles. Soil CO 2 emissions, two active OC fractions, and activities of three enzymes were monitored during incubation periods. At the thawing stage of the first FTC, CO 2 emission rates in the three soil layers presented transient peaks being ≈ 1.6-1.7 times higher than those of the unfrozen control sample. Although FTC did not change the overall patterns of decreasing CO 2 emission along the soil profile, FTC significantly reduced the amount of CO 2 emission when compared with the unfrozen control sample, possibly because the small CO 2 emission at the freezing stage neutralized the peak of CO 2 emission at the thawing stage. This study suggests that in the active layer of permafrost peatlands, CO 2 emission during FTCs may be lower than the emission under higher temperatures, but experiment with more temperature gradients should be encouraged to verify this conclusion in the future. Meanwhile, FTC significantly increased water extracted OC release from the three soil layers, ≈ 1.2-1.6 times higher compared to the unfrozen control sample, indicating that soil carbon loss in the form of leachate may increase during freezing-thawing periods. Additionally, the CO 2 emissions impacted by FTCs were significantly correlated with active OC fractions and enzyme activities, which indicated that active OC and enzymes were sensitive to FTCs, and surviving microbes and enzymes might use the increased liable substrates and induce the CO 2 emission during freezing-thawing periods.

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Effect of temperature and moisture on soil organic carbon mineralization of predominantly permafrost peatland in the Great Hing'an Mountains, Northeastern China

Cited by 86 publications

References 34 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

Short and Long‐Term Controls on Active Layer and Permafrost Carbon Turnover Across the Arctic

CO₂ emissions from soils of different depths of a permafrost peatland, Northeast China: response to simulated freezing–thawing cycles

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Effect of temperature and moisture on soil organic carbon mineralization of predominantly permafrost peatland in the Great Hing'an Mountains, Northeastern China

Cited by 86 publications

References 34 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

Short and Long‐Term Controls on Active Layer and Permafrost Carbon Turnover Across the Arctic

CO2 emissions from soils of different depths of a permafrost peatland, Northeast China: response to simulated freezing–thawing cycles

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Product

Resources

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CO₂ emissions from soils of different depths of a permafrost peatland, Northeast China: response to simulated freezing–thawing cycles