Organic carbon controls water retention and plant available water in cultivated soils from South Greenland

Weber, Peter Lystbæk; Blaesbjerg, Natasha Hølk; Møldrup, Per; Pesch, Charles; Hermansen, Cecilie; Greve, Mogens Humlekrog; Arthur, Emmanuel; Jonge, Lis de

doi:10.1002/saj2.20490

Cited by 3 publications

(3 citation statements)

References 46 publications

(92 reference statements)

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“…From each site, soil cores were prepared for incubation at a standardised matric potential (ψ m ) of −100 hPa (referred to as pF 2) and at the in situ water content. Adjustment to pF 2 by controlled wetting and drying on sandboxes 52 was achieved in 2 weeks and allowed the effects of OC on CO 2 emissions to be studied without the interaction of randomly different soil water status at the sampling times. However, CO 2 emissions were also measured at in situ water contents to substantiate the rate measurements with pF 2 adjustment and to assess the role of OC content in CO 2 emissions at discrete water content classes.…”

Section: Incubations and Measurement Of Co 2 Emissionsmentioning

confidence: 99%

Underestimation of carbon dioxide emissions from organic-rich agricultural soils

Liang,

Hermansen,

Weber

et al. 2024

Commun Earth Environ

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Organic-rich agricultural soils, including drained peatlands, are hotspots for biogenic CO2 emissions. Due to microbial mineralisation, the organic carbon (OC) content of these soils transitions to that of mineral soils, but it remains unclear how the residual OC content controls the rate of CO2 emission. Here we show that area-scaled CO2 emissions from topsoils with >6% OC are not controlled by OC content and OC density in a comprehensive laboratory incubation experiment. National greenhouse gas inventories assign area-scaled CO2 emission factors to soils with >12% OC, while soils with 6-12% OC are mostly disregarded or treated with lower emission factors. In this respect, our results suggest that CO2 emissions from organic soils could be underestimated by up to 40% in the Danish national inventory submission to the United Nations Framework Convention on Climate Change (UNFCCC). We conclude that global underestimation of area-scaled CO2 emissions from 6-12% OC soils occurs in countries with large proportions of organic soils in transition from organic to organo-mineral soils due to agricultural management. Refining CO2 emission estimates for 6-12% OC soils is critical for the accuracy of national inventories, but also for recognising the climate benefits of initiatives to rewet drained organic soils.

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Section: Incubations and Measurement Of Co 2 Emissionsmentioning

confidence: 99%

Underestimation of carbon dioxide emissions from organic-rich agricultural soils

Liang,

Hermansen,

Weber

et al. 2024

Commun Earth Environ

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“…The formation of meso-and macro-aggregates is accompanied by an increase in total porosity through a reduction in the proportion of small pore sizes in soil with a high fine particle fraction content (Jensen et al, 2020;. This increased porosity creates pore spaces in soil that can be occupied by water (Weber et al, 2023). Organic carbon stored between and within soil aggregates contributes significantly to increasing water retention capacity at various levels of water potential (Yang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Effect of cogongrass biochar enriched with nitrogen fertilizer dissolved in seaweed liquid extract on soil water content of Ultisol

Kilowasid,

Alam,

Rakian

et al. 2024

J. Degrade. Min. Land Manage.

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Ultisol dry land is characterized by significantly low organic carbon content, an important factor influencing soil water content and physico-chemical dynamics. The addition of N fertilizer dissolved in seaweed liquid extract as an enrichment solution can change the character of biochar. Therefore, this study aimed to analyze the characteristics of cogongrass biochar enriched with dissolved N fertilizer in seaweed extract of different species and assess its impact on soil water content in Ultisol. Urea was used as a nitrogen source, and biochar enriched with N fertilizer dissolved in seaweed liquid extract from Kappapychus alvarezii, Sargassum sp., and Ulva lactuca was tested. Biochar dose used was 20% of soil weight with a 10% extract concentration for each type. Furthermore, five-level treatments were tested in a pot experiment, namely (i) without biochar, (ii) biochar unenriched, (iii) enriched with N fertilizer dissolved in K. alvarezii extract, (iv) enriched with N fertilizer dissolved in Sargassum sp. extract, and (v) biochar enriched with N fertilizer dissolved in U. lactuca extract. Each treatment was repeated three times, following a randomized block design. The results showed that cogongrass biochar enriched with N fertilizer dissolved in seaweed extract had a more amorphous surface morphology structure. The proportion of elements and functional groups in cogongrass biochar changed. Enriched biochar increased Ultisol moisture levels, but water holding capacity and retention were lower than the unenriched sample.

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“…One way of improving irrigation efficiency is to enhance the SWR. For that, various studies have shown the influence of organic matter content on increasing this property [4,5]. Panagea et al [6] studied the impact of soil organic carbon (SOC) changes due to different management strategies on the SWR of loamy soils in long-term experiments in Europe.…”

Section: Introductionmentioning

confidence: 99%

Influence of Date Palm-Based Biochar and Compost on Water Retention Properties of Soils with Different Sand Contents

Le Guyader,

Morvan,

Miconnet

et al. 2024

Forests

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Generally, soils of arid and semi-arid regions have low water retention properties due to high sand and low organic carbon contents. This study aimed at quantifying the effect of date palm-based organic amendments (OAs) on the water retention properties of two soils (sandy loam and silty loam), as well as the influence of sand supplementation (0.5–2 mm) on the magnitude of the effect of OAs. Different grain size distributions were obtained by adding sand to natural soils. For this purpose, sand was added to the two soils (1/3 and 2/3) and different soil-OA combinations were tested at a dose of 3% by mass: compost alone, biochar alone and a mixture of biochar and compost (50:50 in mass), in addition to unamended control soils. Soil water contents were measured at nine matric potentials ranging from the saturation to the permanent wilting point. Biochar was more efficient than compost at improving soil water retention. The effect of organic amendments on water retention increased with sand content. In most cases, soil water content values were significantly higher for biochar-amended soils than for unamended or compost-amended soils. The weakness of the effect of compost addition (if alone) was probably due to its properties and notably its high mineral content and electrical conductivity. Soil sand supplementation led to higher differences between the OA-amended soils and unamended soils. Changes in available water capacity reached +26% and +80% in a sandy loamy soil enriched with 2/3 sand and amended with compost and with biochar, respectively, compared to the unamended soil. These results show that sand content (and more generally, soil texture) influences the effect of OA application. Thus, the application of biochar from date palm residues in soil seems to be an effective solution to improve the water retention properties of coarse textured soils and contribute to optimizing the use of water resources in irrigated areas.

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Organic carbon controls water retention and plant available water in cultivated soils from South Greenland

Cited by 3 publications

References 46 publications

Underestimation of carbon dioxide emissions from organic-rich agricultural soils

Underestimation of carbon dioxide emissions from organic-rich agricultural soils

Effect of cogongrass biochar enriched with nitrogen fertilizer dissolved in seaweed liquid extract on soil water content of Ultisol

Influence of Date Palm-Based Biochar and Compost on Water Retention Properties of Soils with Different Sand Contents

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