Changes in soil labile and recalcitrant carbon pools after land-use change in a semi-arid agro-pastoral ecotone in Central Asia

Liu, Xiang; Chen, Ditao; Tao, Yang; Huang, Feng; Fu, Shuai; Li, Lanhai

doi:10.1016/j.ecolind.2019.105925

Cited by 46 publications

(35 citation statements)

References 67 publications

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“…The results revealed that the SOC stability decreased when marsh was degraded heavily or severely, causing the depletion of SOC. Similarly, the stability of SOC decreased due to agricultural activities such as tillage and removal of crop biomass after grassland reclamation (Liu et al 2017(Liu et al , 2020Pandey et al 2014). In the eastern part of our study region and adjacent area, water decline under marsh degradation accelerated the decomposition of soil active organic matter and increased the ratio of aliphatic to O-aliphatic C in humus (Guo et al 2013;Luan et al 2014).…”

Section: Effect Of Marsh Degradation On Soc Stabilitymentioning

confidence: 84%

“…In the differently degraded marshes, the proportions of SOC fractions decreased in the order of ROC, LF I and LF II, demonstrating that ROC was the major part of SOC in alpine wetlands, similar to natural grasslands (Ahmed et al 2016;Liu et al 2017Liu et al , 2020. RIc exceeded 50% in the RPM, LDM and MDM, whereas in the HDM and SDM were significantly lower than in the RPM.…”

Section: Effect Of Marsh Degradation On Soc Stabilitymentioning

confidence: 84%

“…The ROC pool can be affected by environmental factors such as short-term plant invasion (Cheng et al 2008), temperature (Xu et al 2010) and tree species composition (Ahmed et al 2016;Wang et al 2013). Furthermore, both labile and recalcitrant C pool in the subsoil can be affected by changes in environmental factors, such as land use and plant species identity (Ahmed et al 2016;Liu et al 2017Liu et al , 2020Rumpel and Kögel-Knabner 2011). The SOC fractions in subsoil had different temperature sensitivity compared with topsoil (Xu et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Simple and rapid chemical methods such as acid hydrolysis (Rovira and Vallejo 2002) and chemical oxidation (Majumder et al 2007) have been extensively employed in analysing SOC stability. Generally, the biochemical recalcitrance of the SOC increases with the recalcitrance index of organic carbon (RIc), calculated as the soil ROC to total organic carbon (TOC) ratio (Liu et al 2020;Rovira and Vallejo 2002). Recently, RIc has been considered as a key indicator in evaluating the SOC stability in grasslands, forests and farmlands (Belay-Tedla et al 2009;Liu et al 2020;Pandey et al 2014;Rovira et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the biochemical recalcitrance of the SOC increases with the recalcitrance index of organic carbon (RIc), calculated as the soil ROC to total organic carbon (TOC) ratio (Liu et al 2020;Rovira and Vallejo 2002). Recently, RIc has been considered as a key indicator in evaluating the SOC stability in grasslands, forests and farmlands (Belay-Tedla et al 2009;Liu et al 2020;Pandey et al 2014;Rovira et al 2010). However, the resistance of SOC to biodegradation during wetland degradation is not well understood.…”

Section: Introductionmentioning

confidence: 99%

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Response of the Organic Carbon Fractions and Stability of Soil to Alpine Marsh Degradation in Zoige, East Qinghai-Tibet Plateau

Zhang

et al. 2020

J Soil Sci Plant Nutr

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Soil organic carbon (SOC) fractions play a crucial role in the carbon cycle of alpine wetland ecosystems and regional climate regulation. In the last decades, alpine marshes at Tibetan Plateau have undergone increased degradation. The effects of marsh degradation on soil labile and recalcitrant organic carbon fractions and on SOC stability remain unclear. In this study, we investigated changes in SOC fractions with different biochemical recalcitrance and stability in the marsh ecosystems with various levels of degradation in the Zoige Wetland, Eastern Qinghai-Tibet Plateau. Soil samples of relatively pristine marsh (RPM), lightly degraded marsh (LDM), moderately degraded marsh (MDM), heavily degraded marsh (HDM) and severely degraded marsh (SDM) were collected and analysed using the acid hydrolysis method. Compared with RPM, the concentrations of SOC labile fraction I (non-cellulosic polysaccharides), SOC labile fraction II (cellulose) and recalcitrant organic carbon (ROC) in degraded marshes decreased significantly: 29-97, 38-95 and 32-99%, respectively, except for the LDM. The SOC recalcitrance index (RIc) in the HDM and SDM was significantly lower than that in RPM by 11-35 and 15-47%, respectively; compared with RPM, the stability of organic carbon was significantly lower in the HDM and SDM. Additionally, the marsh degradation increased vertical variation in the concentrations of SOC fractions. The degradation of alpine marshes decreases the capacity for carbon (C) sequestration via decreasing the resistance of SOC to biodegradation, indicating that the alpine marsh degradation may weaken the carbon sink capacity of the Zoige Plateau, thus aggravating the global greenhouse effect. Keywords Zoige. Marsh degradation. Labile organic carbon. Recalcitrant organic carbon. Soil organic carbon stability Highlights • Concentrations of labile and recalcitrant SOC decreased with marsh degradation. • Vertical variation in labile and recalcitrant SOC increased in degraded marshes. • Resistance of SOC to biodegradation decreased after marsh was moderately degraded. • Marsh degradation reduced the capacity of SOC sequestration.

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Section: Effect Of Marsh Degradation On Soc Stabilitymentioning

confidence: 84%

Section: Effect Of Marsh Degradation On Soc Stabilitymentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Response of the Organic Carbon Fractions and Stability of Soil to Alpine Marsh Degradation in Zoige, East Qinghai-Tibet Plateau

Zhang

et al. 2020

J Soil Sci Plant Nutr

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Conversion of drylands to paddy fields on former wetlands restores soil organic carbon by accumulating labile carbon fractions in the Sanjiang Plain, northeast China

et al. 2022

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BACKGROUND Since the 1990s, drylands have been extensively converted to rice paddy fields on the former wetlands in the Sanjiang Plain of northeast China. However, the influence of this successiveland‐use change from native wetlands to drylands to rice paddy fields on soil organic carbon (C) dynamics remains unexplored. Here, we compared the difference in soil organic C stock among native wetlands, drylands, and paddy fields, and then used a two‐step acid hydrolysis approach to examine the effect of this land‐use change on labile C I (LPI‐C), labile C II (LPII‐C), and recalcitrant C (RP‐C) fractions at depths of 0–15 cm, 15–30 cm, and 30–50 cm. RESULTS Soil organic C stock at a depth of 0–50 cm was reduced by 79% after the conversion of wetlands to drylands but increased by 24% when drylands were converted to paddy fields. Compared with wetlands, paddy fields had 74% lower soil organic C stock at a depth of 0–50 cm. The conversion of wetlands to drylands reduced the concentrations of LPI‐C, LPII‐C, and RP‐C fractions at each soil depth. However, land‐use change from drylands to paddy fields only increased the concentrations of LPI‐C and LPII‐C fractions at the 0–15 cm and 30–50 cm depths. CONCLUSION The conversion of drylands to paddy lands on former wetlands enhances the soil organic C stock by promoting labile C fraction accumulation, and labile C fractions are more sensitive to this successive land‐use change than recalcitrant C fractions in the Sanjiang Plain of northeast China. © 2022 Society of Chemical Industry.

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Soil organic carbon fractionation of spoiled and unspoiled soils under different land use and land cover systems

Bishi

Basti

Sahu

et al. 2023

Environ Monit Assess

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Changes in soil labile and recalcitrant carbon pools after land-use change in a semi-arid agro-pastoral ecotone in Central Asia

Cited by 46 publications

References 67 publications

Response of the Organic Carbon Fractions and Stability of Soil to Alpine Marsh Degradation in Zoige, East Qinghai-Tibet Plateau

Response of the Organic Carbon Fractions and Stability of Soil to Alpine Marsh Degradation in Zoige, East Qinghai-Tibet Plateau

Conversion of drylands to paddy fields on former wetlands restores soil organic carbon by accumulating labile carbon fractions in the Sanjiang Plain, northeast China

Soil organic carbon fractionation of spoiled and unspoiled soils under different land use and land cover systems

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