Decreases in organic C reserves in soils can reduce the catabolic diversity of soil microbial communities

Degens, Bradley P.; Schipper, Louis A.; Sparling, G.P.; Vojvodić-Vuković, Maja

doi:10.1016/s0038-0717(99)00141-8

Cited by 317 publications

(143 citation statements)

References 30 publications

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“…Compared to the crop soil, the A. holosericea plantation induced strong modifications in soil microbial functionalities that reduced soil resistance to increasing stress or disturbance. In the present study, the catabolic evenness of the crop soil was 16.5, which was in accordance with previous studies in which values of catabolic evenness for soils under cropping conditions ranged from 16.4 to 19.6 (17). After 7 years of plantation, A. holosericea trees (inoculated or not with P. albus IR100) had significantly decreased levels of soil catabolic evenness to 9.8 (soil of plantation with uninoculated trees) and 9.5 (soil of plantation with P. albus IR100-inoculated trees), values that are rather low compared to the values reported for the literature (17) but that have already been reported for a glasshouse experiment with Eucalyptus camaldulensis (40).…”

Section: Discussionsupporting

confidence: 93%

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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Section: Discussionsupporting

confidence: 93%

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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“…Water availability in soil will depend not only on physical properties like permeability, bulk density, texture, but also on chemical properties like salinity and organic carbon content, in addition to the climatic regime. In summary, physical soil attributes and soil microbial communities are co-influenced (Degens et al, 2000), and both are affected by soil organic matter.…”

Section: Physical Indicatorsmentioning

confidence: 99%

“…Additionally, the enzyme activities also correlate with the soil microbial biomass (Jiang et al, 2009). Forest cleaning, cropping and management affect the soil microbial diversity and activity (Degens et al, 2000, Stark et al, 2008. Decrease in microbial activity in intensively managed soil in comparison to well managed pastures has been observed (Riffaldi et al, 2002).…”

Section: Indicators Of Soil Health In Forestry Systemsmentioning

confidence: 99%

“…The dispersion of soil aggregates under intensive management is usually less severe than in soils with more inputs of organic matter, which results in greater microbial activity (Qin et al, 2010). On the other hand, the decrease of soil organic matter followed by dispersion of aggregates reduces the macroporosity and the soil oxygenation, and impairs the performance of decomposing microbiota and their access to the organic material (Degens et al, 2000;Tejada et al, 2006;Chodak and Niklinska, 2010). the water film is more intensively interacting with the soil particles (Wong and Griffin, 1976).…”

Section: Physical Indicatorsmentioning

confidence: 99%

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Soil health: looking for suitable indicators. What should be considered to assess the effects of use and management on soil health?

Cardoso¹,

Vasconcellos²,

Bini³

et al. 2013

Sci. agric. (Piracicaba, Braz.)

418

220

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Soil Health refers to the ecological equilibrium and the functionality of a soil and its capacity to maintain a well balanced ecosystem with high biodiversity above and below surface, and productivity. To understand and use soil health as a tool for sustainability, physical, chemical, and biological properties must be employed to verify which respond to the soil use and management within a desired timescale. Attributes with a rapid response to natural or anthropogenic actions are considered good indicators of soil health. Among the physical indicators, soil texture, aggregation, moisture, porosity, and bulk density have been used, while among chemical indicators total C and N, mineral nutrients, organic matter, cation exchange capacity, among others are well established. However, most of them generally have a slow response, when compared to the biological ones, such as microbial biomass C and N, biodiversity, soil enzymes, soil respiration, etc., in addition to macro and mesofauna. Thus, a systemic approach based on different kinds of indicators (physical, chemical and biological) in assessing soil health would be safer than using only one kind of attribute. Many human activities have caused desertification, loss of biodiversity, disruption of aggregates, loss of organic matter and nutrients, among others. Today, it is imperious to maintain soil health and productivity with increasing emphasis on reforestation and recuperation of degraded areas through the use of organic amendments, reintroduction of plants, soil fauna and microorganisms. This review focused on an integrative view on indicators of soil health to be used as tools for prediction of sustainability in production systems.

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“…Soil organic carbon (SOC) plays a vital role in soil fertility and ecological environment because of its large contribution to soil properties, such as soil structure (Bronick and Lal 2005), water retention (Rawls et al 2003), microbial activity (Degens et al 2000), and nutrient availability (Oelofse et al 2015). As a heterogeneous mixture of organic substances, SOC is composed of various fractions with apparent differences in the degree of decomposition, recalcitrance, and turnover rate (Huang et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau

Cao

Yong

et al. 2016

J. Mt. Sci.

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Alpine grassland soils on Qinghai-Tibet Plateau store approximately 33.5 Pg of organic carbon (C) at 0-0.75 m depth and play an important role in the global carbon cycle. We investigated soil organic C (SOC), water-soluble organic C (WSOC), easily oxidizable organic C (EOC), humic C fractions, aggregate-associated C, aggregate stability, and humic acid (HA) composition along an east-west transect across Qinghai-Tibet Plateau, and explored their spatial patterns and controlling factors. The contents of SOC, WSOC, EOC, humic C fractions and aggregate-associated C, the proportions of macroaggregates (2-0.25) and micro-aggregates (0.25-0.053 mm), and the aggregate stability indices all increased in the order alpine desert < alpine steppe < alpine meadow. The alkyl C, O-alkyl C, and aliphatic C/aromatic C ratio of HA increased as alpine desert < alpine meadow < alpine steppe, and the trends were reverse for the aromatic C and HB/HI ratio. Mean annual precipitation and aboveground biomass were significantly correlated with the contents of SOC and its fractions, the proportions of macro-and microaggregates, and the aggregate stability indices along this transect. Among all these C fractions, SOC content and aggregate stability were more closely associated with humic C and silt and clay sized C in comparison with WSOC, EOC, and macro-and microaggregate C. The results suggested that alpine meadow soils containing higher SOC exhibited high soil aggregation and aggregate stability. Mean annual precipitation should be the main climate factor controlling the spatial patterns of SOC, soil aggregation, and aggregate stability in this region. The resistant and stable C fractions rather than labile C fractions are the major determinant of SOC stocks and aggregate stability. Keywords

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Decreases in organic C reserves in soils can reduce the catabolic diversity of soil microbial communities

Cited by 317 publications

References 30 publications

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

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

Soil health: looking for suitable indicators. What should be considered to assess the effects of use and management on soil health?

Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau

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