Carbon saturation drives spatial patterns of soil organic matter losses under long-term bare fallow

Meyer, Nele; Bornemann, Ludger; Welp, Gerhard; Schiedung, Henning; Herbst, Michael; Amelung, Wulf

doi:10.1016/j.geoderma.2017.07.004

Cited by 32 publications

(34 citation statements)

References 64 publications

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“…This supports the theory that tillage mitigates even the most recalcitrant SOC content related to the s+c fraction [44,45]. On the other hand, 14 years of CT could be enough for noticeable SOC reload in the finest fraction, which contradicts the mainstream results underlying the long turnover time of the s+c-related carbon pool [9,46], even though Meyer [22] had detected similarly rapid changes (Figure 4). Since these results are based on case studies, more robust and widespread investigations are needed in order to determine general consequences.…”

Section: Changes In Physical Propertiesmentioning

confidence: 54%

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Soil Organic Matter Alteration Velocity due to Land-Use Change: A Case Study under Conservation Agriculture

et al. 2018

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The cultivation of native forest soils usually triggers a decline in soil organic matter (SOM) and a deterioration of aggregates. Although switching to conservation tillage (CT) can supply SOM, little is known about the temporal resolution of this change. This study aims to quantify changes in soil organic carbon (SOC) content and SOM composition of the same soil under 14 years of CT, plowing tillage (PT), and native forest (NF). Plowing ameliorates the macroaggregate-mediated loss in SOC content, in both the fine fraction and the coarse particles. Decades of CT can significantly increase both the microaggregates and fine particles related to SOC content, whereas in the finest fraction, the volume of recalcitrant SOC increased the most, and reached the original value under NF. Continuous plowing triggered SOM molecular size increases in both aggregates and the fine fraction, whereas switching to CT restored the molecular SOM size of the fine fraction only. Therefore, this fraction can be changed, even in short periods. Water dissolved the largest and middle-sized molecules of SOM, which are mainly from macroaggregates. Even if aggregation did not increase due to turning to CT, the content of the larger molecules of SOM increased in this short time.

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Section: Changes In Physical Propertiesmentioning

confidence: 54%

“…Practically, actual C saturation of a soil does not match with this theoretical value. To quantify the difference, Meyer et al [22] introduced the term 'degree of C saturation', as follows:…”

Section: Introductionmentioning

confidence: 99%

Soil Organic Matter Alteration Velocity due to Land-Use Change: A Case Study under Conservation Agriculture

et al. 2018

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“…Moreover, SOC stocks in saturated zones with a negative carbon balance may currently be particularly at risk of losing C (Meyer et al, 2017). There,

C_{in}

is not high enough to maintain current stocks and a significant proportion of SOC is found in the uncomplexed fraction.…”

Section: Discussionmentioning

confidence: 99%

Feasibility of the 4 per 1000 aspirational target for soil carbon: A case study for France

Martín

Dimassi

Dobarco

et al. 2021

Global Change Biology

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Increasing soil organic carbon (SOC) stocks is a promising way to mitigate the increase in atmospheric CO2 concentration. Based on a simple ratio between CO2 anthropogenic emissions and SOC stocks worldwide, it has been suggested that a 0.4% (4 per 1000) yearly increase in SOC stocks could compensate for current anthropogenic CO2 emissions. Here, we used a reverse RothC modelling approach to estimate the amount of C inputs to soils required to sustain current SOC stocks and to increase them by 4‰ per year over a period of 30 years. We assessed the feasibility of this aspirational target first by comparing the required C input with net primary productivity (NPP) flowing to the soil, and second by considering the SOC saturation concept. Calculations were performed for mainland France, at a 1 km grid cell resolution. Results showed that a 30%–40% increase in C inputs to soil would be needed to obtain a 4‰ increase per year over a 30‐year period. 88.4% of cropland areas were considered unsaturated in terms of mineral‐associated SOC, but characterized by a below target C balance, that is, less NPP available than required to reach the 4‰ aspirational target. Conversely, 90.4% of unimproved grasslands were characterized by an above target C balance, that is, enough NPP to reach the 4‰ objective, but 59.1% were also saturated. The situation of improved grasslands and forests was more evenly distributed among the four categories (saturated vs. unsaturated and above vs below target C balance). Future data from soil monitoring networks should enable to validate these results. Overall, our results suggest that, for mainland France, priorities should be (1) to increase NPP returns in cropland soils that are unsaturated and have a below target carbon balance and (2) to preserve SOC stocks in other land uses.

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“…По другим оценкам средняя степень насыщенности пахотных почв на юге Германии составляла 50%, почв под естественными пастбищами и лесом -77 и 103%, соответственно, а углеродсеквестрирующий потенциал почв этих угодий равен 15, 5 и 1 т С га -1 (Wiesmeier et al, 2014). За 11 лет чистого пара степень насыщенности углеродом почвы с содержанием пыли и глины около 80% и валовым содержанием С орг 12.2 г/кг снизилась с 55 до 46%, а углеродсеквестрирующий потенциал возрос с 23 до 27 т/га (Meyer et al, 2017). Важно отметить, что полученные для почв Европейской части России показатели углеродпротекторной емкости и степени насыщенности углеродом следует рассматривать как предварительные и ориентировочные, хотя они и совпадают в той или иной степени с литературными данными.…”

Section: результаты и обсуждениеunclassified

“…Определены уровни углеродпротекторной емкости ряда почв европейской части России согласно и , базирующиеся на информации по содержанию тонкодисперсных фракций и минералогическому составу почв. Рассчитаны степени насыщенности этих почв углеродом и их углеродсеквестрирующий потенциал по Meyer et al (2017) и Wiesmeier et al (2014). Установлено, что серые лесные и каштановые почвы относятся к мало насыщенным органическим углеродом, луговая слитизированная и пойменная луговая -к умеренно насыщенным, а черноземы -к насыщенным.…”

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Estimation of soil saturation with organic carbon

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Семенов

2020

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Работа проведена при поддержке ФЦП "Глобальный климат и агроландшафты России: разработка системы оценки и управления рисками деградации Русских черноземов" и гранта Российского научного фонда, проект № 17-14-01120. Acknowledgments:The studies were carried out with the financial support of the federal target programme "Global climate and agrolandscapes of Russia: development of the system for assessment and management of Russian chernozem degradation risks" and Russian Science Foundation, in scientific project No. 17-14-01120.

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Carbon saturation drives spatial patterns of soil organic matter losses under long-term bare fallow

Cited by 32 publications

References 64 publications

Soil Organic Matter Alteration Velocity due to Land-Use Change: A Case Study under Conservation Agriculture

Soil Organic Matter Alteration Velocity due to Land-Use Change: A Case Study under Conservation Agriculture

Feasibility of the 4 per 1000 aspirational target for soil carbon: A case study for France

Estimation of soil saturation with organic carbon

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