Response of soil microbial communities to agroecological versus conventional systems of extensive agriculture

Chavarría, Diego N.; Brandán, Carolina Pérez; Serri, Dannae Lilia; Meriles, José Manuel; Restovich, Silvina Beatriz; Andriulo, Adrián Enrique; Jacquelin, Luis; Vargas-Gil, Silvina

doi:10.1016/j.agee.2018.05.008

Cited by 62 publications

(24 citation statements)

References 53 publications

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“…This implies that even though the bacterial and fungal population levels differed significantly between CC and NCC, their proportions remained same. In contrast, Chavarria et al (2018) found a 24.3% lower fungi to bacteria ratio in NCC treatment compared to CC in a study where microbial biomass was estimated by the chloroform fumigation technique. In general, fungi tend to dominate in systems with higher organic inputs due to their greater C assimilation efficiencies compared to bacteria, whereas bacteria tend to dominate in systems with lower organic matter levels (Bailey et al, 2002).…”

Section: Fungi To Bacteria Ratiomentioning

confidence: 79%

“…Other studies on the effects of CC on microbial community using different methods have provided variable results. A study by Detheridge et al (2016) using DNA metabarcoding to identify the fungal population has confirmed that CC use and reduced tillage can increase the AMF and CHEG fungi (members of the families Clavariaceae, Hygrophoraceae, Entolomataceae, and Geoglossaceae) levels, whereas another study conducted to identify microbial biomass carbon by the chloroform fumigation-inoculation technique found no significant differences between CC and NCC treatments in the abundance of fungal and bacterial communities (Chavarria et al, 2018). Our PLFA results showed significant increases in AMF in 2018 and gram (+) and gram (−) bacteria in 2016 and 2018 in CC compared to NCC.…”

Section: Cover Crop and No Cover Crop Effects On Soil Microbesmentioning

confidence: 99%

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Cover Crops on Temporal and Spatial Variations in Soil Microbial Communities by Phospholipid Fatty Acid Profiling

et al. 2019

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Although cover crops (CC) are believed to play a major role in soil quality improvement, the effects of CC on microbial populations and community structure is not well understood. The objective of this study was to quantify CC effects on soil microbial biomass and community structure under a corn (Zea mays L.)-soybean [Glycine max (L.) Merr.] rotation. The study was conducted at the Chariton County Cover Crop Soil Health Research and Demonstration Farm (CCSH) in Missouri, USA, where CC were first established in 2012. Soils were sampled in 2016, 2017, and 2018 from the 0-to 10-cm depth layer using a grid sampling design and phospholipid fatty acid (PLFA) profiles were determined. Microbial biomass and microbial community structure (total fungi, total bacteria, rhizobia, gram (−), and actinomycetes biomass), as estimated from the PLFA biomarkers, were significantly greater (P < 0.05) in the CC treatment compared to no cover crop (NCC) in 2016 and 2018 (2.4-and 1.7-fold larger, respectively). Within the CC treatment, differences by soil type were also observed, finding that the silt loam soil supported greater total microbial biomass than the loam soil in 2018. Spatial distribution patterns of total microbial biomass, bacteria biomass and fungi biomass differed with time. Overall, this study demonstrated that the CC treatment affected the soil microbial community biomass and structure, which has potential environmental, production, and soil quality benefits.

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Section: Fungi To Bacteria Ratiomentioning

confidence: 79%

Section: Cover Crop and No Cover Crop Effects On Soil Microbesmentioning

confidence: 99%

Cover Crops on Temporal and Spatial Variations in Soil Microbial Communities by Phospholipid Fatty Acid Profiling

et al. 2019

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“…In addition, many soil physical properties, for example, soil bulk density, porosity, and permeability, will be improved in the surface soils after agricultural abandonment [4], and these soil physical properties can affect the rate of soil organic matter (SOM) decomposition [5]. Soil microbial diversity and quantity generally increase after agricultural abandonment [6,7], which improves SOM stabilization through secretion of organic products. Increased vegetation abundance through agricultural abandonment aging enhances the input of SOM through leaf litters and root exudates [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Soil Aggregate Stability on Soil Organic Carbon and Nitrogen under Land Use Change in an Erodible Region in Southwest China

Liu

Zhang

2019

IJERPH

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Soil aggregate stability can indicate soil quality, and affects soil organic carbon (SOC) and soil organic nitrogen (SON) sequestration. However, for erodible soils, the effects of soil aggregate stability on SOC and SON under land use change are not well known. In this study, soil aggregate distribution, SOC and SON content, soil aggregate stability, and soil erodibility were determined in the soils at different depths along the stages following agricultural abandonment, including cropland, abandoned cropland, and native vegetation land in an erodible region of Southwest China. Soil aggregation, soil aggregate stability, and SOC and SON content in the 0–20 cm depth soils increased after agricultural abandonment, but soil texture and soil erodibility were not affected by land use change. Soil erodibility remained in a low level when SOC contents were over 20 g·kg−1, and it significantly increased with the loss of soil organic matter (SOM). The SOC and SON contents increased with soil aggregate stability. This study suggests that rapidly recovered soil aggregate stability after agricultural abandonment promotes SOM sequestration, whereas sufficient SOM can effectively maintain soil quality in karst ecological restoration.

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“…It is estimated that living microorganisms, aggregate to organic matter and rhizosphere, occupy less than 5% of the total space of soil. What makes this environment a dynamic and living space, with a central role in processes of decomposition and cycling of nutrients available to the plants through the mineralization (Chavarria et al, 2018;Lehmann et al, 2018;Zheng et al, 2018).…”

Section: Application Of Plant Growth Promoting Microorganismsmentioning

confidence: 99%

“…The microorganisms applied on agroecological and organic systems have influence on the health and microbial activity of the soil (Chavarria et al, 2018). Soil community is diverse, constituted by fungi and bacterium that perform as promoters of plant growth (Leite et al, 2016;Silva et al, 2017;Trinh et al, 2018).…”

Section: Application Of Plant Growth Promoting Microorganismsmentioning

confidence: 99%

Humic Substances and Efficient Microorganisms: Elicitation of Medicinal Plants—A Review

Pereira¹,

Morais²,

Marques³

et al. 2019

JAS

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In function of the green revolution the indiscriminate use of agrochemicals and pesticides in agriculture has been also shown in the production of medicinal plants, resulting in the increase of productivity but with high residual contamination and low rates in the production of secondary metabolites responsible for the biological and pharmacological activity in vegetable drugs. In another hand, new techniques of elicitation has been applied to stimulate the medicinal plants production through the organic and agroecological management, contributing for the increase of performance, quality and production. In this context, it is aimed with this review to present such as the humic substances: fulvic acid, humic acid and efficient microorganisms which influence and help the ontogeny and the secondary metabolites production of medicinal plants. The reviewed articles show that the use of fulvic acid, humic acid and efficient microorganisms in the production of medicinal plants contributes on the increase of biosynthesis, secondary metabolites production such as coumarins, alkaloids, phenylpropanoids and essential oils, as well as the increase of nutrients absorption, growth and development of species.

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Response of soil microbial communities to agroecological versus conventional systems of extensive agriculture

Cited by 62 publications

References 53 publications

Cover Crops on Temporal and Spatial Variations in Soil Microbial Communities by Phospholipid Fatty Acid Profiling

Cover Crops on Temporal and Spatial Variations in Soil Microbial Communities by Phospholipid Fatty Acid Profiling

Effects of Soil Aggregate Stability on Soil Organic Carbon and Nitrogen under Land Use Change in an Erodible Region in Southwest China

Humic Substances and Efficient Microorganisms: Elicitation of Medicinal Plants—A Review

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