2016
DOI: 10.3390/f7080161
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Diurnal Freeze-Thaw Cycles Modify Winter Soil Respiration in a Desert Shrub-Land Ecosystem

Abstract: Abstract:Winter soil respiration (R s ) is becoming a significant component of annual carbon budgets with more warming in winter than summer. However, little is known about the controlling mechanisms of winter R s in dryland. We made continuous measurements of R s in four microsites (non-crust (BS), lichen (LC), moss (MC), and a mixture of moss and lichen (ML)) in a desert shrub-land ecosystem northern China, to investigate the causes of R s dynamics in winter. The mean winter R s ranged from 0.10 to 0.17 µmol… Show more

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Cited by 15 publications
(10 citation statements)
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“…The Qinghai-Tibet Plateau (QTP) of China has the largest extent of permafrost in the low to middle latitudes of the world and is very sensitive to global climate change (Liu and Chen, 2000;Wu et al, 2010). Soil organic carbon (SOC) pools in the permafrost regions of the QTP were estimated to be 160 ± 87 Pg, which is approximately 8.7 % of those in the northern circumpolar permafrost region (Mu et al, 2015).…”
Section: Introductionmentioning
confidence: 99%
“…The Qinghai-Tibet Plateau (QTP) of China has the largest extent of permafrost in the low to middle latitudes of the world and is very sensitive to global climate change (Liu and Chen, 2000;Wu et al, 2010). Soil organic carbon (SOC) pools in the permafrost regions of the QTP were estimated to be 160 ± 87 Pg, which is approximately 8.7 % of those in the northern circumpolar permafrost region (Mu et al, 2015).…”
Section: Introductionmentioning
confidence: 99%
“…Freeze–thaw cycles (FTCs) regulate globally important processes, including nutrient cycling, biological activity, soil aggregation, soil greenhouse gas emissions, and winter hydrology (Boswell, Balster, Bajcz, & Thompson, 2020; Liu et al., 2016; Song, Zou, Wang, & Yu, 2017; Wagner‐Riddle et al., 2017; Watanabe & Osada, 2017). Approximately 58% of the land area in the northern hemisphere is directly affected by winter FTCs (Zhang, 2005).…”
Section: Introductionmentioning
confidence: 99%
“…Hence, models considering only autotrophic and heterotrophic respiration often fail to account for the observed F S dynamics (Austin and Vivanco, 2006). Gas-transport processes are im-portant mechanisms regulating the magnitudes and hysteretic features of soil CO 2 fluxes (Ma et al, 2013). A substantial fraction of respired CO 2 may be transported to the atmosphere via xylem and may not be measured by techniques like soil reparation chambers (Bloemen et al, 2013(Bloemen et al, , 2016.…”
Section: Introductionmentioning
confidence: 99%
“…During wet periods, soil CO 2 efflux could decrease significantly by water clogging of soil pores, which restricts the diffusion of O 2 and CO 2 gases (Šimunek and Suarez, 1993;Fang and Moncrieff, 1999). In dryland soils of high salinity/alkalinity, CO 2 transport and the water cycle are tightly coupled, as large inorganic C fluxes can be driven solely by dissolution and infiltration of CO 2 and carbonates (Buysse et al, 2013;Ma et al, 2013;Fa et al, 2014). Such inorganic processes may introduce fluctuations not only to hourly or diurnal soil CO 2 effluxes (e.g.…”
Section: Introductionmentioning
confidence: 99%