Soil carbon flux research in the Asian region: Review and future perspectives

Sha, Liqing; Teramoto, Masaaki; Noh, Nam Jin; Hirano, Shoji; Yang, Meng; Sanwangsri, Montri; Liang, Naishen

doi:10.2480/agrmet.d-20-00013

Cited by 10 publications

(2 citation statements)

References 364 publications

(290 reference statements)

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“…Thus, PAR was considered to be the primary driver for NEE during the growing season at the diurnal time scale. Previous studies have also demonstrated that carbon absorption is largely affected by PAR (Yang et al, 2011;Jia et al, 2014), whereas carbon release is mainly controlled by temperature (Sha et al, 2021).…”

Section: Discussion Diurnal Variation In Net Ecosystem Co 2 Exchangementioning

confidence: 98%

Environmental Controls on Multi-Scale Dynamics of Net Carbon Dioxide Exchange From an Alpine Peatland on the Eastern Qinghai-Tibet Plateau

et al. 2022

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Peatlands are characterized by their large carbon storage capacity and play an essential role in the global carbon cycle. However, the future of the carbon stored in peatland ecosystems under a changing climate remains unclear. In this study, based on the eddy covariance technique, we investigated the net ecosystem CO2 exchange (NEE) and its controlling factors of the Hongyuan peatland, which is a part of the Ruoergai peatland on the eastern Qinghai-Tibet Plateau (QTP). Our results show that the Hongyuan alpine peatland was a CO2 sink with an annual NEE of −226.61 and −185.35 g C m–2 in 2014 and 2015, respectively. While, the non-growing season NEE was 53.35 and 75.08 g C m–2 in 2014 and 2015, suggesting that non-growing seasons carbon emissions should not be neglected. Clear diurnal variation in NEE was observed during the observation period, with the maximum CO2 uptake appearing at 12:30 (Beijing time, UTC+8). The Q10 value of the non-growing season in 2014 and 2015 was significantly higher than that in the growing season, which suggested that the CO2 flux in the non-growing season was more sensitive to warming than that in the growing season. We investigated the multi-scale temporal variations in NEE during the growing season using wavelet analysis. On daily timescales, photosynthetically active radiation was the primary driver of NEE. Seasonal variation in NEE was mainly driven by soil temperature. The amount of precipitation was more responsible for annual variation of NEE. The increasing number of precipitation event was associated with increasing annual carbon uptake. This study highlights the need for continuous eddy covariance measurements and time series analysis approaches to deepen our understanding of the temporal variability in NEE and multi-scale correlation between NEE and environmental factors.

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Section: Discussion Diurnal Variation In Net Ecosystem Co 2 Exchangementioning

confidence: 98%

Environmental Controls on Multi-Scale Dynamics of Net Carbon Dioxide Exchange From an Alpine Peatland on the Eastern Qinghai-Tibet Plateau

et al. 2022

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“…The ratio of R h to R s varied from 10 to 90% in terrestrial ecosystems, depending on vegetation types and seasonal variations [12]. On average, R a contributed 45.8% in forest ecosystems and 60.4% in non-forest ecosystems to R s [13]. Based on soil FCO 2 data from 54 forest sites, we summarized that R a and R h were approximately evenly partitioned, ranging between 50 and 60% [4].…”

Section: Introductionmentioning

confidence: 90%

Seasonal Dynamics of Soil Respiration and Its Autotrophic and Heterotrophic Components in Subtropical Camphor Forests

He,

Yan,

Peng

et al. 2023

Forests

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On a global scale, soil respiration (Rs), representing the CO2 flux between the soil surface and the atmosphere, ranks as the second-largest terrestrial carbon (C) flux. Understanding the dynamics between Rs and its autotrophic (Ra) and heterotrophic (Rh) components is necessary for accurately evaluating and predicting global C balance and net ecosystem production under environmental change. In this study, we conducted a two-year root exclusion experiment in subtropical China’s Camphor (Cinnamomum camphora (L.) Presl.) forests to assess seasonal changes in Ra and Rh and their relative contributions to Rs. Additionally, we examined the influence of environmental factors on the dynamics of Ra, Rh, and Rs. Our results showed that seasonal mean Rs values were 2.88 µmol m−2 s−1, with mean Ra and Rh of 1.21 and 1.67 µmol m−2 s−1, respectively, in the studied forests. On an annual basis, the annual values of mean Rs in the studied forests were 405 ± 219 g C m−2 year−1, with Rh and Ra accounting for 240 ± 120 and 164 ± 102 g C m−2 year−1, respectively. The seasonal mean ratio of Rh to Rs (Rh/Rs) was 58%, varying from 45 to 81%. Seasonal changes in Rs and Rh were strongly correlated with soil temperature but not soil water content. Both Rh and Rs increased exponentially with the average soil temperature measured in the topsoil layer (about 5 cm), with Q10 values of 2.02 and 1.73 for Rh and Rs, respectively. Our results suggest that the composition and activity of soil microbes and fauna play a primary role in releasing carbon flux from soil to the atmosphere in the studied forest ecosystems.

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Life cycle assessment and fertilization scheme optimization of paddy field crops in South China

Liu

Xiang

Liu

et al. 2021

Journal of Cleaner Production

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Soil carbon flux research in the Asian region: Review and future perspectives

Cited by 10 publications

References 364 publications

Environmental Controls on Multi-Scale Dynamics of Net Carbon Dioxide Exchange From an Alpine Peatland on the Eastern Qinghai-Tibet Plateau

Environmental Controls on Multi-Scale Dynamics of Net Carbon Dioxide Exchange From an Alpine Peatland on the Eastern Qinghai-Tibet Plateau

Seasonal Dynamics of Soil Respiration and Its Autotrophic and Heterotrophic Components in Subtropical Camphor Forests

Life cycle assessment and fertilization scheme optimization of paddy field crops in South China

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