Differences of soil CO2 flux in two contrasting subalpine ecosystems on the eastern edge of the Qinghai-Tibetan Plateau: A four-year study

Deng, Min; Li, Andi; Wu, Yanhong; Zhao, Zuoping; Peng, Changhui; DeLuca, Thomas H.; Sun, Shouqin

doi:10.1016/j.atmosenv.2018.10.067

Cited by 15 publications

(13 citation statements)

References 51 publications

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“…Temperature is a key limiting factor for high-altitude ecosystems (Duan et al, 2019). In this study, the negative correlation between the soil temperature and SOC further confirmed that changes in soil temperature induced by warming or seasons could be used to explain the change in SOC (Supplementary Table S1).…”

Section: Discussionsupporting

confidence: 77%

Experimental Warming Has Not Affected the Changes in Soil Organic Carbon During the Growing Season in an Alpine Meadow Ecosystem on the Qinghai–Tibet Plateau

et al. 2022

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The effects of climate warming and season on soil organic carbon (SOC) have received widespread attention, but how climate warming affects the seasonal changes of SOC remains unclear. Here, we established a gradient warming experiment to investigate plant attributes and soil physicochemical and microbial properties that were potentially associated with changes in SOC at the beginning (May) and end (August) of the growing season in an alpine meadow ecosystem on the Qinghai–Tibet Plateau. The SOC of August was lower than that of May, and the storage of SOC in August decreased by an average of 18.53 million grams of carbon per hectare. Warming not only failed to alter the content of SOC regardless of the season but also did not affect the change in SOC during the growing season. Among all the variables measured, microbial biomass carbon was highly coupled to the change in SOC. These findings indicate that alpine meadow soil is a source of carbon during the growing season, but climate warming has no significant impact on it. This study highlights that in the regulation of carbon source or pool in alpine meadow ecosystem, more attention should be paid to changes in SOC during the growing season, rather than climate warming.

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Section: Discussionsupporting

confidence: 77%

Experimental Warming Has Not Affected the Changes in Soil Organic Carbon During the Growing Season in an Alpine Meadow Ecosystem on the Qinghai–Tibet Plateau

et al. 2022

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“…Similar to results reported here, our published data showed that soil in the same forest serves as a CO 2 source (Duan et al 2019;Sun et al 2017) and bryophyte removal may decrease soil CO 2 emission (Sun et al 2017). These findings, along with the N 2 O and CH 4 flux results from the current study demonstrate that the subalpine coniferous forests on eastern slope of Tibetan Plateau serve as an important source of GHGs and that terrestrial bryophytes may regulate the fluxes of these GHGs.…”

Section: Influence Of Bryophyte Removal On Soil Ghg Fluxessupporting

confidence: 88%

Bryophytes impact the fluxes of soil non-carbon dioxide greenhouse gases in a subalpine coniferous forest

DeLuca

Sun

et al. 2020

Biol Fertil Soils

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Terrestrial bryophytes substantially regulate ecosystem processes in high latitude and high elevation ecosystems; however, the role of these plants in mediating soil emissions of non-CO 2 greenhouse gases (GHGs) (N 2 O and CH 4 ) in these ecosystems remains poorly understood. A removal experiment was conducted to investigate the influence of bryophytes on soil non-CO 2 GHGs emission in a subalpine coniferous forest on the eastern edge of the Tibetan Plateau. Bryophyte removal decreased the average N 2 O emission rate, but did not significantly alter the CH 4 flux rate. The cumulative amount of N 2 O emission and CH 4 uptake was decreased by bryophyte removal. Compared to bryophyte-removal plots, soil in the control plots had higher concentrations of soil organic C (SOC), total N (TN), dissolved organic C (DOC), dissolved N (DN), and exchangeable NH 4 + . The control plots also had higher cumulative N 2 O emission and CH 4 uptake compared to plots with bryophytes removed. Bryophyteremoval significantly changed the relationship between soil non-CO 2 GHGs flux rates and soil water content, induced a linear decreasing relationship between the N 2 O emission rate and soil water content and a quadratic relationship between CH 4 flux rate and soil water content in the bryophyte-removal plots. Results from this study indicate that bryophytes may regulate non-GHG emissions from subalpine coniferous soils and demonstrate that in the presence of bryophytes, these soils may act as a greater N 2 O source and CH 4 sink in southwestern China.

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“…Because of the lack of long-term and large-scale soil respiration observation data, we synthesized the results of 53 soil respiration measurements from published journal articles (Geng et al, 2012;Lu et al, 2013;Pang et al, 2013;Chen et al, 2014;Liu et al, 2015;Li et al, 2017Li et al, , 2019Ma et al, 2018;Wang et al, 2018Wang et al, , 2020Duan et al, 2019;Sun et al, 2019). Most of these measurements included soil respiration results for the growing season.…”

Section: Introductionmentioning

confidence: 99%

Different responses of soil respiration to climate change in permafrost and non‐permafrost regions of the Tibetan plateau from 1979 to 2018

Pan

et al. 2022

Intl Journal of Climatology

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Soil respiration is the primary efflux of carbon dioxide (CO 2 ) in the terrestrial ecosystem. The soil of alpine grassland on the Tibetan Plateau (TP) is rich in soil organic matter, which may release more carbon dioxide as the climate warming. However, due to the limited observations here, there are still deficiencies in understanding the response of soil respiration to climate change, especially the difference between permafrost and non-permafrost regions. In this paper, we investigate the climatology and trend of soil respiration on the TP from 1979 to 2018, using the Community Land Model version 4.5 (CLM4.5) forced by a suite of high-resolution atmosphere dataset. Evaluation resultsshow that the land surface model could properly reproduce permafrost extent, and capture the spatial pattern of soil temperature, soil moisture, leaf area index (LAI), and soil respiration. For the whole TP, we find that the spatial pattern for both climatology and trends of soil respiration are correlated with LAI significantly and positively. In addition to the effects of vegetation, precipitation was more correlated with soil respiration than temperature among climatic variables in recent decades. For permafrost and non-permafrost regions, climate change affects soil respiration in different ways. In permafrost areas, precipitation plays a more important role than temperature. Conversely, in non-permafrost regions, temperature has a more pronounced effect on soil respiration. The results of this study provide valuable information for predicting greenhouse gas emissions and understanding the carbon cycle on the TP.

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Differences of soil CO2 flux in two contrasting subalpine ecosystems on the eastern edge of the Qinghai-Tibetan Plateau: A four-year study

Cited by 15 publications

References 51 publications

Experimental Warming Has Not Affected the Changes in Soil Organic Carbon During the Growing Season in an Alpine Meadow Ecosystem on the Qinghai–Tibet Plateau

Experimental Warming Has Not Affected the Changes in Soil Organic Carbon During the Growing Season in an Alpine Meadow Ecosystem on the Qinghai–Tibet Plateau

Bryophytes impact the fluxes of soil non-carbon dioxide greenhouse gases in a subalpine coniferous forest

Different responses of soil respiration to climate change in permafrost and non‐permafrost regions of the Tibetan plateau from 1979 to 2018

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