Effects of tillage, crop rotation and N application rate on labile and recalcitrant soil carbon in a Mediterranean Vertisol

Muñoz‐Romero, Verónica; López‐Bellido, Rafael J.; Fernández‐García, Purificación; Redondo, Ramón; Murillo, Sergio; López‐Bellido, Luis

doi:10.1016/j.still.2017.02.004

Cited by 23 publications

(19 citation statements)

References 27 publications

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“…The application of NT resulted in higher SOC and LOC fractions compared to CT treatment (Table 2). This is similar to previous findings [49][50][51]. Soil cultivation increases the influence of freezing-thawing and drying-rewetting cycles on soil properties, which increases aggregate disruption and accelerates the LOC mineralization and decline in SOC [18,47,52].…”

Section: Discussionsupporting

confidence: 91%

Soil Organic Carbon and Labile Carbon Pools Attributed by Tillage, Crop Residue and Crop Rotation Management in Sweet Sorghum Cropping System

et al. 2020

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Labile organic carbon (LOC) fractions are considered as sensitive indicators of change in soil quality and can serve as proxies for soil organic carbon (SOC). Although the impact of tillage, crop rotation and crop residue management on soil quality is well known, less is known about LOC and SOC dynamics in the sweet sorghum production systems in South Africa. This short-term study tested two tillage levels: no-till and conventional-tillage, two crop rotations: sweet-sorghum/winter grazing vetch/sweet sorghum and sweet-sorghum/winter fallow/sweet sorghum rotations and three crop residue retention levels: 30%, 15% and 0%. Tillage was the main factor to influence SOC and LOC fractions under the sweet sorghum cropping system in South Africa. NT increased SOC and all LOC fractions compared to CT, which concurs with previous findings. Cold water extractable organic carbon (CWEOC) and hot water extractable organic carbon (HWEOC) were found to be more sensitive to tillage and strongly positively correlated to SOC. An increase in residue retention led to an increase in microbial biomass carbon (MBC). This study concludes that CWEOC and HWEOC can serve as sensitive early indicators of change in soil quality and are an ideal proxy for SOC in the sweet-sorghum cropping system in South Africa.

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Section: Discussionsupporting

confidence: 91%

Soil Organic Carbon and Labile Carbon Pools Attributed by Tillage, Crop Residue and Crop Rotation Management in Sweet Sorghum Cropping System

et al. 2020

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“…Very little influence of N rate (100 kg N ha −1 ) on SOC was observed in a Mediterranean Vertisol [27]. However, for a Vertisol in central India, the SOC content in the 100% NPK treatment increased by 23% [23].…”

Section: Soil C and Nmentioning

confidence: 90%

Effects of Long-Term Fertilization on Organic Carbon and Nitrogen Dynamics in a Vertisol in Eastern China

Li¹,

Chen²,

Cao³

et al. 2018

OJSS

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Mineral fertilizers and organic amendment can affect the various soil organic matter (SOM) pools and the distribution of organic carbon (OC) and nitrogen (N) in these pools. It is unknown how OC and N are distributed in different SOM pools under different long-term fertilization regimes. Therefore, this study aimed to examine the effects on OC and N concentrations in various SOM pools after 33 years of application of chemical fertilizer and organic amendment in Anhui Province in the Huang-Huai-Hai Plain, eastern China. This long-term experiment consisted of five fertilization treatments measuring changes in the OC and N concentrations in the soils and different SOM fractions of each experiment plot. Organic amendment increased the OC and N concentrations in the mineral-associated fraction, the coarse mineral-associated fraction and the aggregates compared with the values obtained without fertilizer application. Mineral fertilizer application alone increased the abovementioned indexes, but this increase was small. There was a small but significant increase in the OC and N concentrations in the free particulate fraction, and the change in magnitude had no obvious effect on the total OC (TOC) and total N (TN) concentrations in soils. More than 80% of the water-stable aggregate-associated C was stored in macroaggregates >2 mm in size. More than 60% of the TOC and TN accumulated within mineral associations in the soil, and organic amendment increased this proportion to 80%. These results suggest that the OC in Vertisols is dominated by mineral-associated OC and that the effect of organic amendment on mineral-associated OC is obvious.

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“…Examination of SOM partitioning and allocation between labile particulate organic matter (POM) and stabilized mineral-associated organic matter (MAOM) under contrasting land management can be an effective approach to understand how soil, plants, and microbes interact with management and environmental conditions, influence C cycling, and change soil quality (Figueiredo et al 2010;Castro et al 2015). While the labile POM pool cycles rapidly and controls the shortterm availability of nutrients (including carbon that supports microbial activity and decomposition processes), the stable MAOM pool serves as a long-term nutrient storage reservoir with relatively slow turnover rate in soils; hence, both POM and MAOM pools mediate the effects of management practices on the capacity or quality of soils to sustain agricultural systems (Gregorich et al 1994;Muñoz-Romero et al 2017). As nitrogen and carbon dynamics influence and interplay with several other key soil properties and processes (nutrient availability, biological activity, soil structure, and water availability), the dynamics of these SOM pools are a multifaceted, paramount controlling factor for soil quality in soil-plant systems (Gregorich et al 1994;Bhowmik et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Soil organic matter dynamics in long-term temperate agroecosystems: rotation and nutrient addition effects

Hernandez‐Ramirez

Kiani

et al. 2018

Can. J. Soil. Sci.

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Soil organic matter (SOM) is a major driver of key agroecosystem functions. Our objective was to examine the dynamics of organic matter in whole soil, particulate (POM; >53 μm size), and mineral-associated (MAOM) fractions under varying crop rotations and nutrient managements at two long-term experimental sites (Breton and Lethbridge). Soil samples were collected from simple (2 yr) and complex (5 or 6 yr) crop rotations at the 5-10 cm depth. We found associations between SOM pools versus microbial community and soil aggregation. Compared to cropped soils, an adjacent forest exhibited a significantly higher soil total organic carbon (TOC) and a shift in SOM fractions with substantially higher POM. However, the forest soil had the lowest microbial biomass C among all the assessed land use systems (P < 0.05), suggesting that other factors than the amount of labile SOM (i.e., POM-C) were controlling the microbial community. When contrasted to simple 2 yr rotations, the complex rotations including perennials and legumes significantly raised TOC and soil total nitrogen as well as the stable SOM fraction (i.e., MAOM-C and -N) consistently for both Breton and Lethbridge sites. Our findings highlight that varying land managements have profound feedbacks on soil quality as mediated by alterations in long-term SOM dynamics.Résumé : La matière organique (MO) joue un rôle important dans le fonctionnement des écosystèmes agricoles. Les auteurs voulaient approfondir la dynamique de la MO dans le sol entier, dans les particules de matière organique (PMO; granulométrie > 53 μm) et dans les minéraux associés à la matière organique (MAMO) en fonction du régime d'assolement et de gestion des éléments nutritifs à deux sites expérimentaux à long terme (Breton et Lethbridge). Pour cela, ils ont échantillonné le sol des assolements simples (2 ans) et complexes (5 ou 6 ans) à une profondeur de 5 à 10 cm. Le réservoir de MO présente des liens avec la microflore tellurique et les agrégats. Comparativement aux sols cultivés, le sol d'une forêt contigüe s'est avéré sensiblement plus riche en carbone organique total (COT), et la MO comprenait sensiblement plus de particules. Cependant, le sol forestier présentait la plus faible biomasse microbienne parmi les sols examinés (P < 0,05), signe que d'autres facteurs que la concentration de MO labile (à savoir, le C-PMO) régissent la microflore. Comparativement aux assolements simples de deux ans, les assolements complexes incluant des vivaces et des légumineuses accroissent sensiblement le COT et l'azote total du sol, de même que la fraction de MO stable (à savoir, C-MAMO et N-MAMO), tant aux sites de Breton qu'à ceux de Lethbridge. Ces constatations soulignent que les différents régimes de gestion du sol ont des répercussions appréciables sur la qualité du sol, consécutivement à une modification de la dynamique à long terme de la MO. [Traduit par la Rédaction] Mots-clés : écosystème agricole, biomasse microbienne, matière organique du sol, agrégation, qualité du sol.

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Effects of tillage, crop rotation and N application rate on labile and recalcitrant soil carbon in a Mediterranean Vertisol

Cited by 23 publications

References 27 publications

Soil Organic Carbon and Labile Carbon Pools Attributed by Tillage, Crop Residue and Crop Rotation Management in Sweet Sorghum Cropping System

Soil Organic Carbon and Labile Carbon Pools Attributed by Tillage, Crop Residue and Crop Rotation Management in Sweet Sorghum Cropping System

Effects of Long-Term Fertilization on Organic Carbon and Nitrogen Dynamics in a Vertisol in Eastern China

Soil organic matter dynamics in long-term temperate agroecosystems: rotation and nutrient addition effects

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