Impact of organic amendments on the dynamics of soil microbial biomass and bacterial communities in cultivated land

Calbrix, Raphaël; Barray, Sylvie; Chabrerie, Olivier; Fourrié, Laetitia; Laval, Karine

doi:10.1016/j.apsoil.2006.10.007

Cited by 76 publications

(32 citation statements)

References 40 publications

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“…Thus, the more abundant grass cover in Organic treatments contributed certainly in the increase of TOC contents and microbial biomass as observed by Potthoff et al (2006). Organic matter constitutes a source of nutrients for microorganisms (Calbrix et al, 2007) which increased after the conversion into organic farming and root-exudates are known too to stimulate microbial growth (Bouwman and Arts, 2000;Whitelaw-Weckert et al, 2007). In the same way, Rahman et al (2009) showed positive effects of grass cover on the density of plant-feeding and microbivorous nematodes which agreed with our results.…”

Section: Organic Matter Microbial Biomass and Nematodessupporting

confidence: 81%

Organic viticulture and soil quality: A long-term study in Southern France

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Cadre

Blanchart

et al. 2011

Applied Soil Ecology

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a b s t r a c tThe rate of conversion of conventional vineyards into organic farming is currently increasing. This results in modifications of agricultural practices such as the application of organic manure, the use of tillage or grass-cutting to control weeds and the application of natural pesticides with preventive action. One of the aims of organic farming is to preserve the environment. In this context, the objective of our work was to evaluate the long-term effects of organic viticulture on soil quality. The study was conducted in a commercial vineyard where plots which had been organically managed for 7 (Organic7), 11 (Organic11) and 17 years (Organic17) were compared to conventionally managed plots (Conventional). Soil physical and chemical parameters (bulk density, organic matter, available phosphorus, potassium and copper contents) and biological parameters (soil microbial biomass, density of nematode trophic groups and density and biomass of earthworm ecological categories) were measured. The organic farming led to an increase in soil organic matter, potassium content, soil microbial biomass, plant-feeding and fungalfeeding nematode densities. However, organic farming increased soil compaction, decreased endogeic earthworm density and did not modify the soil micro-food web evaluated by nematofauna analysis. Our study highlights the difficulty to show the benefits of organic farming on global soil quality in this particular pedoclimatic area and set of farming practices.

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Section: Organic Matter Microbial Biomass and Nematodessupporting

confidence: 81%

Organic viticulture and soil quality: A long-term study in Southern France

Coll

Cadre

Blanchart

et al. 2011

Applied Soil Ecology

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“…Interestingly, no significant differences were detected in the bacterial community structure between the CF and OF treatments three months after the last fertilization, indicating that the dynamics of the soil bacterial community structure was unrelated to the applied materials after a certain duration of fertilization. Such a time-related variation in the bacterial community was also found by Calbrix et al (2007) and may be attributed to a seasonal effect. The bacterial and archaeal abundances changed significantly with the sampling time and were lower in the summer than in the winter (Rasche et al, 2011;Jung et al, 2012).…”

Section: Temporal Changes In the Soil Bacterial And Archaeal Communitmentioning

confidence: 81%

不同肥料处理下茶园土壤细菌和古菌群落的时间变化研究

Wang

Yang

et al. 2014

J. Zhejiang Univ. Sci. B

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Abstract:It is important to understand the effects of temporal changes in microbial communities in the acidic soils of tea orchards with different fertilizers. A field experiment involving organic fertilizer (OF), chemical fertilizer (CF), and unfertilized control (CK) treatments was arranged to analyze the temporal changes in the bacterial and archaeal communities at bimonthly intervals based on the 16S ribosomal RNA (rRNA) gene using terminal restriction fragment length polymorphism (T-RFLP) profiling. The abundances of total bacteria, total archaea, and selected functional genes (bacterial and archaeal amoA, bacterial narG, nirK, nirS, and nosZ) were determined by quantitative polymerase chain reaction (qPCR). The results indicate that the structures of bacterial and archaeal communities varied significantly with time and fertilization based on changes in the relative abundance of dominant T-RFs. The abundancy of the detected genes changed with time. The total bacteria, total archaea, and archaeal amoA were less abundant in July. The bacterial amoA and denitrifying genes were less abundant in September, except the nirK gene. The OF treatment increased the abundance of the observed genes, while the CF treatment had little influence on them. The soil temperature significantly affected the bacterial and archaeal community structures. The soil moisture was significantly correlated with the abundance of denitrifying genes. Of the soil chemical properties, soil organic carbon was the most important factor and was significantly correlated with the abundance of the detected genes, except the nirK gene. Overall, this study demonstrated the effects of both temporal alteration and organic fertilizer on the structures of microbial communities and the abundance of genes involved in the nitrogen cycle.

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“…Depending upon their composition and nutrient content, they can also cause significant shifts in the existing microbial community of soil by introducing another diverse microbial pool plus their metabolites into the soil. However, some researchers argue that organic amendments seem to have less prolonged effects on soil microbial communities than seasonal variations or other anthropogenic factors such as the mechanical management of the soil [173]. Recent studies using molecular techniques have identified detectable changes within Proteobacteria, Acidobacteria and Bacteroidetes with the use of organic amendments [174,175].…”

Section: A General Approach: Modify the Whole Soil Communitymentioning

confidence: 99%

Understanding and Enhancing Soil Biological Health: The Solution for Reversing Soil Degradation

et al. 2015

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Our objective is to provide an optimistic strategy for reversing soil degradation by increasing public and private research efforts to understand the role of soil biology, particularly microbiology, on the health of our world's soils. We begin by defining soil quality/soil health (which we consider to be interchangeable terms), characterizing healthy soil resources, and relating the significance of soil health to agroecosystems and their functions. We examine how soil biology influences soil health and how biological properties and processes contribute to sustainability of agriculture and ecosystem services. We continue by examining what can be done to manipulate soil biology to: (i) increase nutrient availability for production of high yielding, high quality crops; (ii) protect crops from pests, pathogens, weeds; and (iii) manage other factors limiting production, provision of ecosystem services, and resilience to stresses like droughts. Next we look to the future by asking what needs to be known about soil biology that is not currently recognized or fully understood and how these needs could be addressed using emerging research tools. We conclude, based on our perceptions of how new knowledge regarding soil biology will help make agriculture more sustainable and productive, by recommending research emphases that should receive first priority through enhanced public and private research in order to reverse the trajectory toward global soil degradation.

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Impact of organic amendments on the dynamics of soil microbial biomass and bacterial communities in cultivated land

Cited by 76 publications

References 40 publications

Organic viticulture and soil quality: A long-term study in Southern France

Organic viticulture and soil quality: A long-term study in Southern France

不同肥料处理下茶园土壤细菌和古菌群落的时间变化研究

Understanding and Enhancing Soil Biological Health: The Solution for Reversing Soil Degradation

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