Soils can help mitigate CO
            <sub>2</sub>
            emissions, despite the challenges

Loisel, Julie; Connors, John P. Casellas; Hugelius, Gustaf; Harden, J. W.; Morgan, Cristine L.S.

doi:10.1073/pnas.1900444116

Cited by 23 publications

(17 citation statements)

References 9 publications

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“…required for microbial metabolism, (iii) interactions with the soil matrix and associated energy costs, and (iv) the physical soil conditions (temperature, pH, humidity, etc.) (Manzoni et al, 2012;Geyer et al, 2016;Lashermes et al, 2016;Mooshammer et al, 2014). It is also likely to change according to the climatic and atmospheric conditions (Schimel, 2013;Allison et al, 2010;Sistla et al, 2013).…”

Section: Om Mineralizationmentioning

confidence: 99%

“…For example, degradation of ligno-cellulosic debris (low nitrogen) is temporarily delayed in the absence of mineral nitrogen. Many other C, N and P stoichiometry effects are involved in priming, biotic interactions or carbon-use efficiency (CUE) (Manzoni et al, 2012). C : N : P ratios ranging from 72 : 6 : 1 (observed in topsoils) to 32 : 5 : 1 (observed in pastures) have been reported (Bertrand et al, 2019).…”

Section: Renewal Rates At the Soil Profile Scale: Deep C Dynamicsmentioning

confidence: 99%

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Reviews and syntheses: The mechanisms underlying carbon storage in soil

2020

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Abstract. Soil organic matter (OM) represents a key C pool for climate regulation but also an essential component for soil functions and services. Scientific research in the 21st century has considerably improved our knowledge of soil organic matter and its dynamics, particularly under the pressure of the global disruption of the carbon cycle. This paper reviews the processes that control C dynamics in soil, the representation of these processes over time, and their dependence on variations in major biotic and abiotic factors. The most recent advanced knowledge gained on soil organic matter includes the following. (1) Most organic matter is composed of small molecules, derived from living organisms, without transformation via additional abiotic organic polymerization; (2) microbial compounds are predominant in the long term; (3) primary belowground production contributes more to organic matter than aboveground inputs; (4) the contribution of less biodegradable compounds to soil organic matter is low in the long term; (5) two major factors determine the soil organic carbon production “yield” from the initial substrates: the yield of carbon used by microorganisms and the association with minerals, particularly poorly crystalline minerals, which stabilize microbial compounds; (6) interactions between plants and microorganisms also regulate the carbon turnover time and therefore carbon stocks; (7) among abiotic and biotic factors that regulate the carbon turnover time, only a few are considered in current modeling approaches (i.e., temperature, soil water content, pH, particle size, and sometimes C and N interactions); and (8) although most models of soil C dynamics assume that the processes involved are linear, there are now many indications of nonlinear soil C dynamics processes linked to soil OM dynamics (e.g., priming). Farming practices, therefore, affect soil C stocks not only through carbon inputs but also via their effect on microbial and organomineral interactions, yet it has still not been possible to properly identify the main mechanisms involved in C loss (or gain). Greater insight into these mechanisms and their interdependencies, hierarchy and sensitivity to agricultural practices could provide future levers of action for C sequestration in soil.

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Section: Om Mineralizationmentioning

confidence: 99%

Section: Renewal Rates At the Soil Profile Scale: Deep C Dynamicsmentioning

confidence: 99%

Reviews and syntheses: The mechanisms underlying carbon storage in soil

2020

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“…We thank Loisel et al (1) for their response to our article (2), which questions the ability of soil C sequestration to be the negative emissions strategy that has been widely advocated (ref. 3 and https://www.4p1000.org/).…”

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confidence: 99%

“…Loisel et al's letter (1) illuminates the chasm that exists between scientific conceptions of problems and the paths to their solutions (if they have one). Soil scientists have rolled both climate mitigation and adaption into a call for soil C sequestration.…”

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confidence: 99%

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Reply to Loisel et al.: Soil in climate mitigation and adaptation

Amundson¹,

Biardeau²

2019

Proc. Natl. Acad. Sci. U.S.A.

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Pruning and green manure from Alnus acuminata improve soil health, and potato and wheat productivity in Rwanda

Cyamweshi,

Muthuri,

Kuyah

et al. 2023

Agroforest Syst

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Alnus acuminata Kunth. (alnus) has been widely promoted under climate change mitigation and adaptation programs in the East African highlands. However, information is lacking on the impact of its pruning management and green manure (GM) application on soil health and the productivity of associated crops. Using a large suit of soil quality indicators, crop growth and yield measurements, this study identi ed appropriate combinations of alnus pruning levels and GM application for sustainable intensi cation of potato (Solanum tuberosum) and wheat (Triticum aestivum) production. This study compared six treatments, namely, (1) sole crops of potato or wheat (control), (2) sole crop + GM, (3) 75% pruning, (4) 75% pruning + GM, (5) 90% pruning and (6) 90% pruning + GM. The best treatments were the 75% pruning + GM and 90% pruning + GM, which signi cantly differed from the control in soil pH, soil organic carbon (SOC), total nitrogen (TN), total phosphorus (P), exchangeable calcium (Ca) contents, the N:P and C:P stoichiometric ratios and the soil structural stability index (SSI). These treatments increased

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Soils can help mitigate CO ₂ emissions, despite the challenges

Cited by 23 publications

References 9 publications

Reviews and syntheses: The mechanisms underlying carbon storage in soil

Reviews and syntheses: The mechanisms underlying carbon storage in soil

Reply to Loisel et al.: Soil in climate mitigation and adaptation

Pruning and green manure from Alnus acuminata improve soil health, and potato and wheat productivity in Rwanda

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Soils can help mitigate CO 2 emissions, despite the challenges

Cited by 23 publications

References 9 publications

Reviews and syntheses: The mechanisms underlying carbon storage in soil

Reviews and syntheses: The mechanisms underlying carbon storage in soil

Reply to Loisel et al.: Soil in climate mitigation and adaptation

Pruning and green manure from Alnus acuminata improve soil health, and potato and wheat productivity in Rwanda

Contact Info

Product

Resources

About

Soils can help mitigate CO ₂ emissions, despite the challenges