Does soil organic carbon quality or quantity govern relative temperature sensitivity in soil aggregates?

Wankhede, Madhuri; Ghosh, Avijit; Manna, M. C.; Misra, Sukanya; Sirothia, Pawan; Rahman, Mohammad Mahmudur; Bhattacharyya, Pratap; Singh, Muneshwar; Bhattacharyya, Ranjan; Patra, A. K.

doi:10.1007/s10533-020-00653-y

Cited by 19 publications

(5 citation statements)

References 64 publications

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“…Temperature accounted variability for labile C fractions was significantly higher in sandy soil than clayey soil ( Table 1B ). Wankhede et al (2020) , Rittl et al (2020) , Takriti et al (2018) , Ghosh et al (2016) , Frøseth & Bleken (2015) and Hobley et al (2014) found that temperature impacts on labile C fractions was higher in coarse (sandy) than fine (clayey) soils owing to low physical protection, small specific areas, fewer reactive sites, and weak ligand exchange bridges, where soil C could be sorbed and protected. In present study, unlike the labile C fractions, the increase in temperature (T1–T5) caused a significant ( P < 0.05) and continuous increase in the sensitivity and decomposition of recalcitrant (ROC) and stable (TOC) C fractions ( Figs.…”

Section: Discussionmentioning

confidence: 99%

“…2 and 3 ). Wankhede et al (2020) and Zheng et al (2019) examined that in sandy (coarse) soils the temperature response of recalcitrant and stable C fractions was much higher due to weak physical protection, fewer cations bridges, unstable moisture availability, and their low storing ability. The response of C fractions to temperature was in the order recalcitrant C fractions > stable C fractions > labile C fractions ( Figs.…”

Section: Discussionmentioning

confidence: 99%

“…The temperature accounted variability for oxidative and hydrolytic enzymes was markedly higher in sandy soil than clayey soil ( Table 2B ). Wankhede et al (2020) , Cavicchioli et al (2019) , Zheng et al (2019) , Thakur et al (2017) , and Fang et al (2016) assessed a significant increase in the sensitivity and response of extracellular enzymes i.e ., oxidative and hydrolytic with the temperature increase and stated that temperature sensitivity increases strongly in sandy (coarse) soils due to less favorable conditions, unstable moisture, and substrate availability. The results of present study further revealed that the temperature sensitivity of extracellular enzymes was in the order oxidative enzymes > hydrolytic enzymes ( Figs.…”

Section: Discussionmentioning

confidence: 99%

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Temperature responsiveness of soil carbon fractions, microbes, extracellular enzymes and CO₂ emission: mitigating role of texture

Hassan

Saba

et al. 2022

PeerJ

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The interaction of warming and soil texture on responsiveness of the key soil processes i.e. organic carbon (C) fractions, soil microbes, extracellular enzymes and CO2 emissions remains largely unknown. Global warming raises the relevant question of how different soil processes will respond in near future, and what will be the likely regulatory role of texture? To bridge this gap, this work applied the laboratory incubation method to investigate the effects of temperature changes (10–50 °C) on dynamics of labile, recalcitrant and stable C fractions, soil microbes, microbial biomass, activities of extracellular enzymes and CO2 emissions in sandy and clayey textured soils. The role of texture (sandy and clayey) in the mitigation of temperature effect was also investigated. The results revealed that the temperature sensitivity of C fractions and extracellular enzymes was in the order recalcitrant C fractions > stable C fractions > labile C fractions and oxidative enzymes > hydrolytic enzymes. While temperature sensitivity of soil microbes and biomass was in the order bacteria > actinomycetes > fungi ≈ microbial biomass C (MBC) > microbial biomass N (MBN) > microbial biomass N (MBP). Conversely, the temperature effect and sensitivity of all key soil processes including CO2 emissions were significantly (P < 0.05) higher in sandy than clayey textured soil. Results confirmed that under the scenario of global warming and climate change, soils which are sandy in nature are more susceptible to temperature increase and prone to become the CO2-C sources. It was revealed that clayey texture played an important role in mitigating and easing off the undue temperature influence, hence, the sensitivity of key soil processes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Temperature responsiveness of soil carbon fractions, microbes, extracellular enzymes and CO₂ emission: mitigating role of texture

Hassan

Saba

et al. 2022

PeerJ

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“…Thus, understanding the Q 10 of microbial activity could improve our understanding of the potential effect of global warming and soil C dynamics in terrestrial ecosystem models (Ding et al, 2016; Schuur et al, 2015). Previous studies illustrated that Q 10 values are influenced by SOC quality (Davidson & Janssens, 2006; Jia et al, 2019; Wankhede et al, 2020). The 'C‐quality temperature' hypothesis of enzyme kinetic theory predicts that the decomposition of low‐quality C substrates in the subsoil is more sensitive to temperature change that requires a high activation energy (Qin et al, 2019; Rumpel & Kögel‐Knabner, 2010).…”

Section: Introductionmentioning

confidence: 97%

Plant community change mediated heterotrophic respiration increase explains soil organic carbon loss before moderate degradation of alpine meadow

Lai

Peng

et al. 2021

Land Degrad Dev

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Alpine meadows on the Qinghai‐Tibet Plateau (QTP) store a huge amount of plant and soil carbon (C). The degradation of the alpine meadow has led to a significant loss of soil organic C (SOC), which endangers its weak C sink. The change in heterotrophic respiration was hypothesized as one of the primary biological processes for the SOC loss alongside the degradation of alpine meadow. However, little is known about how land degradation impacts Rh due to changes in plant communities and consequent labile organic C inputs. Rh, vegetation productivity, plant community composition, plant lignin concentration, leaf C/N, SOC, and soil labile C (SLC) were measured for alpine meadow grasslands with five degradation levels in 2 years. Our results showed that the SOC of the surface layer (0–10 cm) gradually decreased with land degradation. The plant lignin concentration and C/N ratio gradually increased with land degradation due to the proportion of sedges decreased while that of forbs increased, which consequently led to the soil C quality (SLC) increased before the moderate degradation level (MD) while significantly reduced in severe and very severe degradation levels (SD and VSD). The structural equation modeling result (SEM) revealed that the degradation‐induced change in soil C quality (SLC) due to an alteration in plant community composition relates to the Rh change with grassland degradation, and the Rh (C output) and aboveground biomass (AGB: C input) further mediated the loss of SOC alongside alpine meadow degradation. On average, Rh increased by 49% and 59% from the Intact to slight degradation level (SLD) and MD and reduced by 56% and 69% from MD to SD and VSD. The temperature sensitivity of Rh (Q10) was higher in the SLD (Q10 = 2.84) and MD (Q10 = 2.62) comparing with the Intact (Q10 = 2.58) respectively, but it was lower in SD (Q10 = 2.19) and VSD (Q10 = 1.65). AGB and belowground net primary productivity (BNPP) had no significant change until the MD, while reduced by 60%–90% in SD and VSD. Our results suggest that Rh and its Q10 change moderated by soil C quality alteration due to the plant community shifting could be one mechanism for the soil C loss before MD, but could not be the main pathway for the SOC loss at SD and VSD.

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“…Soil aggregates are the basic units of soil structure, and they represent dense porous structures formed by the cementation of soil mineral particles and SOC (Wankhede et al 2020). Soil aggregation can cause the spatial separation of organisms and SOC, which is considered an important physical protection mechanism of SOC stability (Bird et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Soil organic carbon and its stability after vegetation restoration in Zoige grassland, eastern Qinghai‐Tibet Plateau

Zhao

et al. 2023

Restoration Ecology

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Soil organic carbon (SOC) shapes carbon cycling and climate. Grassland degradation has greatly reduced the SOC of these biomes. However, vegetation restoration is effective at improving the SOC of degraded grasslands, the sustainability of the outcomes of which is unclear. Therefore, we studied the effects of vegetation restoration on SOC and its stability in perspective of three restoration practices (i.e. Hippophae rhamnoides Linn., Elymus nutans Griseb., Avena nuda, and their combinations) in Zoige, a climatically sensitive area located at the eastern Qinghai‐Tibet Plateau. Topsoil samples (0–10 cm) were collected within each restoration practice to analyze SOC and its fraction contents, soil aggregates, and aggregate‐associated SOC content. Results showed that SOC in the control (CK) was 2.77 g kg−1, and vegetation restoration increased the SOC contents by 10.12, 73.00, and 15.81%, respectively. Vegetation restoration significantly increased the easily oxidizable carbon (EOC) and decreased recalcitrant organic carbon (ROC), highlighting different responses of SOC fractions to vegetation restoration. Soil macroaggregate was 8.74% in CK, which was significantly lower than that after vegetation restoration (57.08–81.01%). Vegetation restoration had no impact on non‐aggregated silt + clay fraction‐associated SOC and significantly increased macroaggregate‐associated SOC content, which was the major contributor of total SOC. These findings suggest that vegetation restoration may affect SOC stability by increasing SOC and EOC, decreasing ROC, and changing the compositions of aggregates and aggregate‐associated SOC. However, our study was conducted 3 years after vegetation restoration, which maybe too short of a period to accurately determine SOC stability.

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Does soil organic carbon quality or quantity govern relative temperature sensitivity in soil aggregates?

Cited by 19 publications

References 64 publications

Temperature responsiveness of soil carbon fractions, microbes, extracellular enzymes and CO₂ emission: mitigating role of texture

Temperature responsiveness of soil carbon fractions, microbes, extracellular enzymes and CO₂ emission: mitigating role of texture

Plant community change mediated heterotrophic respiration increase explains soil organic carbon loss before moderate degradation of alpine meadow

Soil organic carbon and its stability after vegetation restoration in Zoige grassland, eastern Qinghai‐Tibet Plateau

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Does soil organic carbon quality or quantity govern relative temperature sensitivity in soil aggregates?

Cited by 19 publications

References 64 publications

Temperature responsiveness of soil carbon fractions, microbes, extracellular enzymes and CO2 emission: mitigating role of texture

Temperature responsiveness of soil carbon fractions, microbes, extracellular enzymes and CO2 emission: mitigating role of texture

Plant community change mediated heterotrophic respiration increase explains soil organic carbon loss before moderate degradation of alpine meadow

Soil organic carbon and its stability after vegetation restoration in Zoige grassland, eastern Qinghai‐Tibet Plateau

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Temperature responsiveness of soil carbon fractions, microbes, extracellular enzymes and CO₂ emission: mitigating role of texture

Temperature responsiveness of soil carbon fractions, microbes, extracellular enzymes and CO₂ emission: mitigating role of texture