Organische Kohlenstoffvorräte von Bodentypen in den Hauptnaturräumen Schleswig-Holsteins (Norddeutschland)

Mordhorst, Anneka; Fleige, Heiner; Zimmermann, Iris; Burbaum, Bernd; Filipinski, Marek; Cordsen, Eckhard; Horn, Rainer

doi:10.2478/boku-2018-0008

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…The German Agricultural Soil Inventory is among the first national inventories to investigate SOC stocks to a depth of 100 cm, with actual site‐specific measurements of bulk density and rock fragment fraction throughout the soil profile. Similar SOC stocks were observed in regional assessments across Germany ( Neufeldt , 2005; Mordhorst et al, 2018). Other national or international soil inventories or surveys within Europe have restricted their investigation to topsoil SOC content ( Jones et al, 2005; Reijneveld et al, 2009; Poeplau et al, 2015), topsoil SOC stocks ( Martin et al, 2011; Heikkinen et al, 2013) or extrapolated topsoil SOC stocks to 100 cm depth using a depth distribution model ( Sleutel et al, 2003).…”

Section: Discussionsupporting

confidence: 77%

Stocks of organic carbon in German agricultural soils—Key results of the first comprehensive inventory

Poeplau

Jacobs

Don

et al. 2020

J. Plant Nutr. Soil Sci.

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Background: There is considerable uncertainty about the actual size of the global soil organic carbon (SOC) pool and its spatial distribution due to insufficient and heterogeneous data coverage.Aims: We aimed to assess the size of the German agricultural SOC stock and develop a stratification approach that could be used in national greenhouse gas reporting.Methods: Soils from a total of 3104 sites, comprising 2234 croplands, 820 permanent grasslands and 50 sites with permanent crops (vineyards, orchards) were sampled in a grid of 8 × 8 km to a depth of 100 cm in fixed depth increments. In addition, a decade of management data was recorded in a questionnaire completed by farmers. Two different approaches were used to stratify cropland and grassland mineral soils and derive homogeneous groups: stratification via soil type (pedogenesis) and via SOC‐relevant soil properties.Results: A total of 146 soils were identified as organic soils, which stored by far the highest average SOC stock of 528 ± 201 Mg ha−1 in 0–100 cm depth. Of the mineral soils, croplands and permanent crops stored on average 61 ± 25 and 62 ± 25 Mg ha−1 in 0–30 cm (topsoil) and 35 ± 30 and 44 ± 28 Mg ha−1 in 30–100 cm (subsoil), while permanent grasslands stored significantly more SOC (88 ± 32 and 47 ± 50 Mg ha−1 in topsoil and subsoil). Overall, topsoils stored 67 ± 14% and subsoils 33 ± 14% of total SOC stocks. Soil C:N ratio, clay content and groundwater level were major factors that explained the spatial variability of SOC stocks in mineral soils. Accordingly, Podzols, Gleysols and Vertisols were found to have the highest SOC stocks.Conclusions: Stratification via soil properties yielded the most comparable cropland and grassland strata and is thus preferable for estimating land‐use change effects, e.g., for greenhouse gas inventories.In total, 2.5 Pg C are stored in the upper 100 cm of German agricultural soils, making them the largest organic carbon pool in terrestrial ecosystems of Germany. This bares a large responsibility for the agricultural sector and society as a whole to maintain and, if possible, enhance this pool.

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Section: Discussionsupporting

confidence: 77%

Stocks of organic carbon in German agricultural soils—Key results of the first comprehensive inventory

Poeplau

Jacobs

Don

et al. 2020

J. Plant Nutr. Soil Sci.

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“…types in the four geological regions is given in Mordhorst et al (2018). This amounted to 342 soil profiles, which were extracted from the data base (that contained > 900 soil profiles).…”

Section: Discussionmentioning

confidence: 99%

Natural and anthropogenic compaction in North Germany (Schleswig‐Holstein): Verification of harmful subsoil compactions

Mordhorst

Fleige

Burbaum

et al. 2020

Soil Use and Management

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Soil compaction arises from natural (geo-or pedogenic) or anthropogenic processes. Pedogenic processes can cause compacted horizons like (petro-) duric, plinthic, calcic or gypsic horizons (Blume & Fleige, 2016), while in North Germany they mainly result from leaching and translocation of substances, like in the argic subsoil (Bt) horizon of Luvisols due to clay accumulation. This is accompanied by the reduction of macropores or the air capacity (AC), as well as the decrease in air permeability and saturated hydraulic conductivity (K s ) in the subsoil,

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“…Despite the higher C input usually observed in soils under both permanent grassland and the grassland phase of a ley-arable rotation compared to arable soils [20,26,53], the absence of SOC changes in this and other studies supports the existence of factors other than management and annual C input that exert a great influence on the subsoil SOC dynamics. The absence of SOC changes observed over time might be attributed to the influence of site-specific conditions associated with soil texture, structure and pedological processes that affect SOC in the soil profile [18,54,55]. The amount of soil mineral-binding particles that protect SOC from microbial degradation and the existence of anoxic conditions that inhibit microbial activity can increase the turnover time of SOC in the subsoil [56].…”

Section: Land Use Change and Tillage Effects On The Subsoil Soc Dynamicsmentioning

confidence: 99%

No-Till Mitigates SOC Losses after Grassland Renovation and Conversion to Silage Maize

et al. 2022

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Many studies recommend no-till (NT) to increase soil organic carbon (SOC) in the topsoil (<30 cm) of arable land to counterbalance greenhouse gas emissions. Its potential use to mitigate SOC losses during conversion and renovation of grassland ecosystems in the top meter soil is yet to be determined. The SOC dynamics of a 10-year-old grassland converted to silage maize (CM) and renovated and seeded (GR) using either conventional tillage (CT) or NT were compared to an undisturbed grassland control (GC) for 7 years, across three fixed soil depth increments (0–30, 30–60, 60–90 cm). The annual C inputs (Cinput) from crop residues were further analyzed. The systems were either non-fertilized (N0) or fertilized with mineral N (N1) according to a demand of 180 and 380 kg N ha−1 year−1 in the silage maize and grassland systems, respectively. For the 7-year period, the renovated grassland using NT ensured maintenance of the initial SOC in the topsoil, while a conversion toward arable cropping resulted in SOC losses, regardless of the tillage method. The use of NT during conversion significantly reduced these losses from 2.5 Mg ha−1 year−1 to 1.8 Mg ha−1 year−1, for a 28% reduction compared to CT. In the subsoil (30–90 cm), SOC remained stable and was not affected by the cropping systems nor by the tillage method. Reduced annual Cinput was found as the main factor affecting SOC losses after grassland removal, regardless of the tillage method. Our findings highlight the potential of NT to mitigate annual SOC losses after grassland conversion if annual Cinput remains high.

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Organische Kohlenstoffvorräte von Bodentypen in den Hauptnaturräumen Schleswig-Holsteins (Norddeutschland)

Cited by 5 publications

References 22 publications

Stocks of organic carbon in German agricultural soils—Key results of the first comprehensive inventory

Stocks of organic carbon in German agricultural soils—Key results of the first comprehensive inventory

Natural and anthropogenic compaction in North Germany (Schleswig‐Holstein): Verification of harmful subsoil compactions

No-Till Mitigates SOC Losses after Grassland Renovation and Conversion to Silage Maize

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