Dynamics of soil aggregate-associated organic carbon based on diversity and high biomass-C input under conservation agriculture in a savanna ecosystem in Cambodia

Hok, Lyda; Sá, João Carlos de Moraes; Boulakia, Stéphane; Reyes, Manuel R.; Ferreira, Ademir de Oliveira; Tivet, Florent; Saab, Sérgio da Costa; Auccaise, R.; Inagaki, Thiago Massao; Schimiguel, Rafael; Ferreira, Lucimara Aparecida; Briedis, Cléver; Canalli, L.B.S.; Kong, Rada; Leng, Vira

doi:10.1016/j.catena.2020.105065

Cited by 12 publications

(8 citation statements)

References 53 publications

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“…Thus, assessing the effects of vegetable cultivation on agroforestry inter-rows should be carried out over longer periods. This is highlighted by the fact that in conventional tillage systems (i) SOC might be redistributed within the soil pro le (McCarty et al, 1998;Ferreira et al, 2018) and (ii) the formation and stability of soil aggregates might be compromised by exposing the physically protected carbon to the soil microbial community (Hok et al, 2021). Soil microbial activity increases due to the aeration and the availability of substrates for their metabolisms, and as result SOC is released from the system as CO 2 (Xiao et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Soil physical and biological quality in a peasant agroforestry system in Southern Brazil

Charnobay

Neto

Auler

et al. 2023

Preprint

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Agroforestry systems bring together social, economic, and environmental services and can be an alternative for promoting development and sustainability in peasant agriculture. This study aimed to evaluate the soil quality in a peasant agroecological agroforestry intercropped with vegetables (South Brazil). Treatments included an agroforestry row (AFS-R) managed under no-tillage and cultivated with trees for fruit and wood production; an agroforestry inter-row (AFS-I) managed with conventional tillage and cultivated with vegetables; and an area managed with conventional tillage (CT). Soil physical assessments comprised soil bulk density, total porosity, macroporosity, microporosity, bioporosity, mean weight diameter of aggregates, field capacity, aeration capacity, soil saturated hydraulic conductivity, and the visual evaluation of soil structure. Microbiological indicators included soil microbial biomass, basal respiration, microbial quotient, metabolic quotient, soil organic carbon, and the most probable number of nitrogen-fixing, ammonifying, and nitrite-oxidizing bacteria. The results demonstrated that AFS-R management improved several soil physical and microbiological attributes, highlighting the importance of plant diversity, organic residue inputs, and no-tillage for soil quality. On the other hand, the tillage practice contributed to structural and microbiological degradation in CT, and more intensively in AFS-I, indicating that more conservationist soil management, like minimum or no-tillage, might be studied as an alternative for the cultivation of vegetable crops in agroforestry systems.

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Section: Discussionmentioning

confidence: 99%

Soil physical and biological quality in a peasant agroforestry system in Southern Brazil

Charnobay

Neto

Auler

et al. 2023

Preprint

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show abstract

“…Increases in SOC are usually observed in the long term, in systems with positive carbon balances, thus assessments of vegetable cultivation effects on agroforestry inter-rows should be carried out over longer periods. This is highlighted by the fact that in conventional tillage systems (i) SOC might be redistributed within the soil pro le (Ferreira et al 2018;McCarty et al 1998) and (ii) the formation and stability of soil aggregates might be compromised by exposing the physically protected carbon to the soil microbial community (Hok et al 2021). Soil microbial activity increases due to the aeration and the availability of substrates for their metabolisms and as a result SOC is released from the system as CO 2 (Xiao et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Soil physical and biological quality in a peasant agroforestry in Southern Brazil

Charnobay

Neto

Auler

et al. 2022

Preprint

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Agroforestry systems bring together social, economic, and environmental services and can be alternatives for promoting development and sustainability in peasant agriculture. This study aimed to evaluate the soil physical and microbiological quality in a four-years peasant agroecological agroforestry intercropped with vegetables, located in Lapa, South Brazil. Treatments included an agroforestry row (AFS-R) managed under no-tillage and cultivated with trees for fruit and wood production; an agroforestry inter-row (AFS-I) managed with conventional tillage and cultivated with vegetables; and an area managed with conventional tillage (CT) for one year and cultivated with landrace maize. Soil physical assessments comprised soil bulk density, total porosity, macroporosity, microporosity, bioporosity, mean weight diameter of aggregates, field capacity, aeration capacity, soil saturated hydraulic conductivity, and the visual evaluation of soil structure. Microbiological indicators included soil microbial biomass, basal respiration, microbial quotient, metabolic quotient, soil organic carbon, and the most probable number of nitrogen-fixing, ammonifying, and nitrite-oxidizing bacteria. The results demonstrated that AFS-R management improved several soil physical and microbiological attributes, highlighting the importance of plants diversity, organic residues input, and no-tillage for soil quality. On the other hand, the tillage practice contributed to structural and microbiological degradation in CT, and more intensively in AFS-I, indicating that more conservationist soil management, like minimum or no-tillage, might be studied as an alternative for the cultivation of vegetable crops in agroforestry systems.

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“…Long‐term experiments support the view that CA increases soil organic carbon (SOC) stocks in tropical and subtropical environments at varying rates according to biomass input, soil texture, temperature, rainfall distribution, and diversification of cropping systems (Amado et al, 2006; Bayer et al, 2009; De Oliveira Ferreira et al, 2016, 2021; De Oliveira Ferreiraet al, 2018; Dieckow et al, 2005; Hok et al, 2021; Mishra et al, 2010; Nicoloso & Rice, 2021; Sá et al, 2014, 2015; Tivet et al, 2013). De Oliveira Ferreira et al (2018) evaluated five CA farms in southern Brazil and reported that SOC increased when the system was based on high crop carbon input and efficient use of nutrients balancing inputs and outputs with special attention to nitrogen.…”

Section: Introductionmentioning

confidence: 90%

Comparing on‐farm and long‐term research experiments on soil carbon recovery by conservation agriculture in Southern Brazil

et al. 2021

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Global studies, generally, and Brazilian studies, specifically, on soil organic carbon (SOC) in experimental research plots, support conservation agriculture (CA) as a tool to partially or totally restore SOC stocks depleted by conventional tillage agriculture. In response, the Brazilian Government implemented in 2010–2030 a “Low Carbon Agriculture Plan” (ABC Plan) program centered on large‐scale CA adoption. However, the projections of SOC recovery based on long‐term research trials may not adequately portray farm level high‐yield operations. The objectives of this study were: (a) quantify and compare SOC stocks to a 1‐m depth in long‐term CA at the farm scale (>20 years) with paired native vegetation and nearest available long‐term research experiments (>30 years) in Southern Brazil; (b) explore the role of oilseed radish (Raphanus sativus L.) as a cover crop to enhance SOC accumulation. In general, farm level CA systems restored SOC at an equal or higher level than the paired research plots. For the farm level CA systems, average SOC recovery was 92% (0–0.30 m) and 97% (0–1.0 m) in the soil profile relative to native vegetation. Moreover, compared to research scale CA, farm level CA average SOC recovery was 91 and 86%, for the same soil layers. Recovery of SOC in research scale CA can be scaled up to farm level systems in Southern Brazil. The main characteristics for SOC recovery (0–1.0 m) were high inputs of plant biomass, lack of soil disturbance, and diversification with oilseed radish cover crop.

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Dynamics of soil aggregate-associated organic carbon based on diversity and high biomass-C input under conservation agriculture in a savanna ecosystem in Cambodia

Cited by 12 publications

References 53 publications

Soil physical and biological quality in a peasant agroforestry system in Southern Brazil

Soil physical and biological quality in a peasant agroforestry system in Southern Brazil

Soil physical and biological quality in a peasant agroforestry in Southern Brazil

Comparing on‐farm and long‐term research experiments on soil carbon recovery by conservation agriculture in Southern Brazil

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