Soil organic phosphorus and microbial community composition as affected by 26 years of different management strategies

Bünemann, Else K.; Marschner, Petra; Smernik, Ronald J.; Conyers, Mark; McNeill, A.

doi:10.1007/s00374-007-0254-2

Cited by 59 publications

(36 citation statements)

References 36 publications

(43 reference statements)

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“…Given the high concentration in available P, we assume that there was no P limitation for microbial growth in this soil. The fungi / bacteria ratio of 0.09-0.14 in this soil (Bünemann et al, 2008b) suggests a high proportion of fungi relative to its organic matter concentration (Frostegård and Bååth, 1996). Given the typically high C : P ratios of fungi (Table 1), this might explain the wide microbial C : P ratios in the Wagga Wagga soils.…”

Section: Relations Between C N P Inputs and Budgets And Soil Nutriementioning

confidence: 85%

“…Most of the soil variables, except total P, resin P, and microbial P, were related to the C and N budgets derived from Heenan et al (2004). The positive linear relationships observed between total C, total N, organic P, dissolved N, microbial C, microbial N, and the C budget (p < 0.05 in each case, Table S6) are linked to the accumulation of organic matter (Bünemann et al, 2008b). The increased total C, total N, and organic P concentrations in WS-M-D are probably related to the improved aggregate stability, porosity, and infiltration rate compared to WW-B-C (Zhang et al, 2007).…”

Section: Relations Between C N P Inputs and Budgets And Soil Propermentioning

confidence: 91%

“…and experienced a climate with hot, dry summers and cold winters. Mean annual rainfall was 570 mm, and mean annual temperature 15.9 • C. At the beginning of the trial, the soil pH in H 2 O of the top 5 cm soil was 5.5 (Bünemann et al, 2008b), and the soil contained 29 % clay, 15 % silt, and 56 % sand in the top 10 cm . Soil mineralogy was dominated by quartz, kaolinite, illite, and iron oxides (mostly haematite) (M. Conyers, personal communication, 2015).…”

Section: Description Of the Wagga Wagga Field Experimentsmentioning

confidence: 99%

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Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

Frossard

Buchmann

Bünemann

et al. 2016

SOIL

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Abstract. Stoichiometric approaches have been applied to understand the relationship between soil organic matter dynamics and biological nutrient transformations. However, very few studies have explicitly considered the effects of agricultural management practices on the soil C : N : P ratio. The aim of this study was to assess how different input types and rates would affect the C : N : P molar ratios of bulk soil, organic matter and microbial biomass in cropped soils in the long term. Thus, we analysed the C, N, and P inputs and budgets as well as soil properties in three long-term experiments established on different soil types: the Saria soil fertility trial (Burkina Faso), the Wagga Wagga rotation/stubble management/soil preparation trial (Australia), and the DOK (bio-Dynamic, bio-Organic, and “Konventionell”) cropping system trial (Switzerland). In each of these trials, there was a large range of C, N, and P inputs which had a strong impact on element concentrations in soils. However, although C : N : P ratios of the inputs were highly variable, they had only weak effects on soil C : N : P ratios. At Saria, a positive correlation was found between the N : P ratio of inputs and microbial biomass, while no relation was observed between the nutrient ratios of inputs and soil organic matter. At Wagga Wagga, the C : P ratio of inputs was significantly correlated to total soil C : P, N : P, and C : N ratios, but had no impact on the elemental composition of microbial biomass. In the DOK trial, a positive correlation was found between the C budget and the C to organic P ratio in soils, while the nutrient ratios of inputs were not related to those in the microbial biomass. We argue that these responses are due to differences in soil properties among sites. At Saria, the soil is dominated by quartz and some kaolinite, has a coarse texture, a fragile structure, and a low nutrient content. Thus, microorganisms feed on inputs (plant residues, manure). In contrast, the soil at Wagga Wagga contains illite and haematite, is richer in clay and nutrients, and has a stable structure. Thus, organic matter is protected from mineralization and can therefore accumulate, allowing microorganisms to feed on soil nutrients and to keep a constant C : N : P ratio. The DOK soil represents an intermediate situation, with high nutrient concentrations, but a rather fragile soil structure, where organic matter does not accumulate. We conclude that the study of C, N, and P ratios is important to understand the functioning of cropped soils in the long term, but that it must be coupled with a precise assessment of element inputs and budgets in the system and a good understanding of the ability of soils to stabilize C, N, and P compounds.

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Section: Relations Between C N P Inputs and Budgets And Soil Nutriementioning

confidence: 85%

Section: Relations Between C N P Inputs and Budgets And Soil Propermentioning

confidence: 91%

Section: Description Of the Wagga Wagga Field Experimentsmentioning

confidence: 99%

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Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

Frossard

Buchmann

Bünemann

et al. 2016

SOIL

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“…The high-CEC values were mainly due to organic matter content whose property of organic carbon is specific to soils with a high content of biochar, such as ADE soils. Agricultural management can affect soil properties, including the organic matter chemistry and microbial community structure, but the relationship between these two parameters has not yet been well described (Bünemann et al, 2008). The origin and mineralization processes of soil organic P are less understood; however, differences in the microbial community composition may also influence the chemical composition of organic P in the soil, according to Makarov et al (2005).…”

Section: Resultsmentioning

confidence: 99%

Functional diversity of bacterial genes associated with aromatic hydrocarbon degradation in anthropogenic dark earth of Amazonia

Germano

Cannavan

Mendes

et al. 2012

Pesq. agropec. bras.

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The objective of this work was to evaluate the catabolic gene diversity for the bacterial degradation of aromatic hydrocarbons in anthropogenic dark earth of Amazonia (ADE) and their biochar (BC). Functional diversity analyses in ADE soils can provide information on how adaptive microorganisms may influence the fertility of soils and what is their involvement in biogeochemical cycles. For this, clone libraries containing the gene encoding for the alpha subunit of aromatic ring-hydroxylating dioxygenases (α-ARHD bacterial gene) were constructed, totaling 800 clones. These libraries were prepared from samples of an ADE soil under two different land uses, located at the Caldeirão Experimental Station - secondary forest (SF) and agriculture (AG) -, and the biochar (SF_BC and AG_BC, respectively). Heterogeneity estimates indicated greater diversity in BC libraries; and Venn diagrams showed more unique operational protein clusters (OPC) in the SF_BC library than the ADE soil, which indicates that specific metabolic processes may occur in biochar. Phylogenetic analysis showed unidentified dioxygenases in ADE soils. Libraries containing functional gene encoding for the alpha subunit of the aromatic ring-hydroxylating dioxygenases (ARHD) gene from biochar show higher diversity indices than those of ADE under secondary forest and agriculture.

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“…Agricultural management can affect soil organic matter chemistry and microbial community structure, but the relationship between the two is not well understood [36]. The origin and mineralization processes of soil organic P are less well understood [37].…”

Section: Model I Of Amazonian Agricultural System: the "Slash-and-burmentioning

confidence: 99%

A Molecular Survey of the Diversity of Microbial Communities in Different Amazonian Agricultural Model Systems

et al. 2010

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Abstract:The processes of land conversion and agricultural intensification are a significant cause of biodiversity loss, with consequent negative effects both on the environment and the sustainability of food production. The anthrosols associated with pre-Colombian settlements in the Amazonian region are examples of how anthropogenic activities may sustain the native populations against harsh tropical environments for human establishment, even without a previous intentionality of anthropic soil formation. In a case study (Model I-"Slash-andBurn") the community structures detected by automated ribosomal intergenic spacer analysis (ARISA) revealed that soil archaeal, bacterial and fungal communities are heterogeneous and each capable of responding differently to environmental characteristics. ARISA data evidenced considerable difference in structure existing between microbial communities in forest and agricultural soils. In a second study (Model II-"Anthropogenic Soil"), the bacterial community structures revealed by terminal restriction fragment length polymorphism (T-RFLP) differed among an Amazonian Dark Earth (ADE), black carbon (BC) and its adjacent non-anthropogenic oxisoil. The bacterial 16S rRNA gene (OTU) richness estimated by pyrosequencing was higher in ADE than BC. The most abundant bacterial phyla in ADE soils and BC were Proteobacteria-24% ADE, 15% BC; Acidobacteria-10% ADE, 21% BC; Actinobacteria-7% ADE, 12% BC; Verrucomicrobia, 8% ADE; 9% BC; Firmicutes-3% ADE, 8% BC. Overall, unclassified bacteria corresponded to 36% ADE, and 26% BC. Regardless of current land uses, our data suggest OPEN ACCESSDiversity 2010, 2 788 that soil microbial community structures may be strongly influenced by the historical soil management and that anthrosols in Amazonia, of anthropogenic origins, in addition to their capacity of enhancing crop yields, may also improve microbial diversity, with the support of the black carbon, which may sustain a particular and unique habitat for the microbes.

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Soil organic phosphorus and microbial community composition as affected by 26 years of different management strategies

Cited by 59 publications

References 36 publications

Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

Functional diversity of bacterial genes associated with aromatic hydrocarbon degradation in anthropogenic dark earth of Amazonia

A Molecular Survey of the Diversity of Microbial Communities in Different Amazonian Agricultural Model Systems

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Soil organic phosphorus and microbial community composition as affected by 26 years of different management strategies

Cited by 59 publications

References 36 publications

Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

Functional diversity of bacterial genes associated with aromatic hydrocarbon degradation in anthropogenic dark earth of Amazonia

A Molecular Survey of the Diversity of Microbial Communities in Different Amazonian Agricultural Model Systems

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Product

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Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term