Is the microbial community in a soil with reduced catabolic diversity less resistant to stress or disturbance?

Degens, Bradley P.; Schipper, Louis A.; Sparling, G.P.; Duncan, Louise C.

doi:10.1016/s0038-0717(01)00018-9

Cited by 262 publications

(129 citation statements)

References 30 publications

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“…When comparing abandoned fields (where cultivation had ceased), only the field abandoned 45 years ago presented a microbial community structure comparable to those from fields with no history of cultivation. Anthropogenic activities, including agricultural land management practices, directly and indirectly affect soil environments and thus may also alter the activity and diversity of soil microbial communities [39][40][41][42][43][44][45].…”

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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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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“…Microbial activity showed a classical "hump-back" pattern in response to increasing stress or disturbance. This effect (predicted by the intermediate disturbance hypothesis) has been frequently reported for plant communities (3) but more rarely for soil microbial communities (18,20). According to this hypothesis, it is assumed that under conditions of minimal stress or disturbance microbial diversity is poor and that under conditions of greater stress and disturbance this microbial diversity increases until stress or disturbance reaches levels that permit the growth of only a few species.…”

Section: Discussionmentioning

confidence: 65%

“…Degens et al (18) showed that soils with reduced catabolic evenness are less resistance to stress and disturbance. These results are consistent with those recorded in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…Each soil sample, maintained at field moisture content (50% of maximum water holding capacity), was subjected to one stress and three disturbance treatments according to the methods described by Degens et al (18). The stress treatment consisted of increasing soil salinity.…”

Section: Methodsmentioning

confidence: 99%

“…After each stress or disturbance treatment, soil samples were kept at 25°C in sealed plastic bags for 2 weeks to permit equilibration of the microbial communities and decomposition of organic C from microorganisms destroyed by the treatments (18).…”

Section: Methodsmentioning

confidence: 99%

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The Exotic Legume Tree Species Acacia holosericea Alters Microbial Soil Functionalities and the Structure of the Arbuscular Mycorrhizal Community

Remigi

Faye

Kane

et al. 2008

Appl Environ Microbiol

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The response of microbial functional diversity as well as its resistance to stress or disturbances caused by the introduction of an exotic tree species, Acacia holosericea, ectomycorrhized or not with Pisolithus albus, was examined. The results show that this ectomycorrhizal fungus promotes drastically the growth of this fastgrowing tree species in field conditions after 7 years of plantation. Compared to the crop soil surrounding the A. holosericea plantation, this exotic tree species, associated or not with the ectomycorrhizal symbiont, induced strong modifications in soil microbial functionalities (assessed by measuring the patterns of in situ catabolic potential of microbial communities) and reduced soil resistance in response to increasing stress or disturbance (salinity, temperature, and freeze-thaw and wet-dry cycles). In addition, A. holosericea strongly modified the structure of arbuscular mycorrhizal fungus communities. These results show clearly that exotic plants may be responsible for important changes in soil microbiota affecting the structure and functions of microbial communities.Forest loss and degradation through human disturbance as well as deterioration of land productivity is a major problem in large areas of arid and semiarid environments. Degraded soils are characterized by loss or disturbance of the vegetation cover, increased soil erosion, decreased in-water infiltration, loss of available nutrients and organic matter, loss of microbial propagules, and/or diminution in microbial activity (25,35,44). Restoration of ecosystem health and productivity was traditionally achieved via abandonment of land and subsequent natural forest succession. In recent decades, management options for acceleration of the recovery and restoration of the productivity and biodiversity of disturbed ecosystems have been considered, since fallow periods have been shortened or eliminated due to increased anthropogenic pressure and agriculture intensification (49). Concerning the techniques used for rehabilitating degraded areas, there is increasing evidence that forest plantations can play a key role in ecosystem rehabilitation or restoration (52). Among candidate plantation species, fast-growing leguminous tree species (e.g., Australian Acacia species) should have preference.

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Effects of Treated Municipal Wastewater Irrigation on Soil Microbiology

Minz

Karyo

Gerstl

2010

Treated Wastewater in Agriculture

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Is the microbial community in a soil with reduced catabolic diversity less resistant to stress or disturbance?

Cited by 262 publications

References 30 publications

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

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

The Exotic Legume Tree Species Acacia holosericea Alters Microbial Soil Functionalities and the Structure of the Arbuscular Mycorrhizal Community

Effects of Treated Municipal Wastewater Irrigation on Soil Microbiology

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