A distinct sensitivity to the priming effect between labile and stable soil organic carbon

Zhang, Qiufang; Feng, Jiguang; Li, Jian; Huang, Ching‐Yu; Shen, Yongming; Cheng, Weixin; Zhu, Biao

doi:10.1111/nph.18458

Cited by 29 publications

(7 citation statements)

References 75 publications

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“…This implies that the energy limitation of deep SOC decomposition related to its poor energy quality is exacerbated by the lack of energy supply by plant Article https://doi.org/10.1038/s41467-022-34951-w roots due to their low density at depth, thus contributing of deep SOC persistence. These results also contribute to the growing body of evidence showing the greater sensitivity to priming of SOC with higher persistence because of a greater energy limitation of decomposition 41 .…”

Section: Discussionsupporting

confidence: 61%

“…In order to compensate for the low nutrient availability and plant growth potential expected in subsoil relative to topsoil, we fertilised the planted subsoil microcosms for each soil type on day 51 after planting. Unplanted subsoil microcosms were kept unfertilised to avoid excessive concentrations of mineral nutrients, which already tend to accumulate in soils in absence of rhizodeposition and nutrient uptake by plant roots 41,88 . The fertilisation solution was composed of inorganic N (NH 4 NO 3 ), P, S, K and Mg, with a dose of 11.5, 0.6, 1.0, 1.5 and 0.7 g m −2 , respectively.…”

Section: Plant Isotopic Labelling and Soil Incubation Experimentsmentioning

confidence: 99%

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Bioenergetic control of soil carbon dynamics across depth

et al. 2022

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Soil carbon dynamics is strongly controlled by depth globally, with increasingly slow dynamics found at depth. The mechanistic basis remains however controversial, limiting our ability to predict carbon cycle-climate feedbacks. Here we combine radiocarbon and thermal analyses with long-term incubations in absence/presence of continuously 13C/14C-labelled plants to show that bioenergetic constraints of decomposers consistently drive the depth-dependency of soil carbon dynamics over a range of mineral reactivity contexts. The slow dynamics of subsoil carbon is tightly related to both its low energy density and high activation energy of decomposition, leading to an unfavourable ‘return-on-energy-investment’ for decomposers. We also observe strong acceleration of millennia-old subsoil carbon decomposition induced by roots (‘rhizosphere priming’), showing that sufficient supply of energy by roots is able to alleviate the strong energy limitation of decomposition. These findings demonstrate that subsoil carbon persistence results from its poor energy quality together with the lack of energy supply by roots due to their low density at depth.

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Section: Discussionsupporting

confidence: 61%

Section: Plant Isotopic Labelling and Soil Incubation Experimentsmentioning

confidence: 99%

Bioenergetic control of soil carbon dynamics across depth

et al. 2022

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“…Compared with labile SOC, stable SOC can be more vulnerable to priming once microbes are provided with exogenous C substrates. This high vulnerability of stable SOC to priming warrants more attention in future studies on SOC cycling and global change (Zhang et al 2022). Overall, stable functional SOC molecular structure indicated that soil warming and N enrichment had similarly affected easily decomposable and stabilized SOC of this C-rich grassland soil despite the C loss.…”

Section: Effects Of N Enrichment and Warming On Soc Chemical Composit...mentioning

confidence: 94%

Nine years of warming and nitrogen addition in the Tibetan grassland promoted loss of soil organic carbon but did not alter the bulk change of chemical structure

Sun,

Schmidt,

et al. 2023

Preprint

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Abstract. Understanding the changes in soil organic carbon (SOC) storage and chemical stabilization dynamics is important for accurately predicting ecosystem C sequestration and/or potential C loss, but the relevant information, especially for the intervention of environmental controls on grassland soil is limited in Tibetan plateau regions. Here we used a 9-year two-way factorial experiment involving warming with open top chambers (+1.80 °C in the daytime and +0.77 °C in the nighttime at the soil surface) and multilevel nitrogen (N) enrichment treatments (0, 5, 10, and 15 g m-2 year-1) in the Tibetan plateau to investigate the changes in SOC pool size and chemical structure. 9-year warming treatment significantly decreased SOC stock in the Tibetan grassland. We observed decreasing SOC concentrations which may be related to changes in the C-degrading enzymes. Surprisingly, the SOC molecular structure remained unchanged in all N enrichment and warmed plots, suggesting that both treatments had affected all forms of SOC, from simple and complex polymeric in a similar way. Our results suggest that long-term warming stimulates soil C loss but no preference in SOC loss with different chemical structure.

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“…SOC stability (characterized by chemical resistance and physical chemistry protection) can better account for differences in the priming effect than the plant, soil, and microbial characteristics [ 44 ]. The priming effect of soil carbon increases with an increase in soil refractory carbon components but decreases with an increase in soil aggregate and mineral protection [ 45 ]. The relatively more stable SOC has a higher priming effect than the unstable SOC does.…”

Section: Root Exudates and Soil Organic Carbon Effluxmentioning

confidence: 99%

Root Exudates Mediate the Processes of Soil Organic Carbon Input and Efflux

Shen

Zhao

et al. 2023

Plants

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Root exudates, as an important form of material input from plants to the soil, regulate the carbon input and efflux of plant rhizosphere soil and play an important role in maintaining the carbon and nutrient balance of the whole ecosystem. Root exudates are notoriously difficult to collect due to their underlying characteristics (e.g., low concentration and fast turnover rate) and the associated methodological challenges of accurately measuring root exudates in native soils. As a result, up until now, it has been difficult to accurately quantify the soil organic carbon input from root exudates to the soil in most studies. In recent years, the contribution and ecological effects of root exudates to soil organic carbon input and efflux have been paid more and more attention. However, the ecological mechanism of soil organic carbon input and efflux mediated by root exudates are rarely analyzed comprehensively. In this review, the main processes and influencing factors of soil organic carbon input and efflux mediated by root exudates are demonstrated. Soil minerals and soil microbes play key roles in the processes. The carbon allocation from plants to soil is influenced by the relationship between root exudates and root functional traits. Compared with the quantity of root exudates, the response of root exudate quality to environmental changes affects soil carbon function more. In the future, the contribution of root exudates in different plants to soil carbon turnover and their relationship with soil nutrient availability will be accurately quantified, which will be helpful to understand the mechanism of soil organic carbon sequestration.

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A distinct sensitivity to the priming effect between labile and stable soil organic carbon

Cited by 29 publications

References 75 publications

Bioenergetic control of soil carbon dynamics across depth

Bioenergetic control of soil carbon dynamics across depth

Nine years of warming and nitrogen addition in the Tibetan grassland promoted loss of soil organic carbon but did not alter the bulk change of chemical structure

Root Exudates Mediate the Processes of Soil Organic Carbon Input and Efflux

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