Soil microbial indicators sensitive to land use conversion from pastures to commercial Eucalyptus grandis (Hill ex Maiden) plantations in Uruguay

Sicardi, Margarita; Garcı́a-Préchac, Fernando; Frioni, L.

doi:10.1016/j.apsoil.2004.05.004

Cited by 111 publications

(65 citation statements)

References 18 publications

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“…According to Swift et al (1979), decreasing pH in decaying litter was mainly due to the leaching of acidic material from the vacuoles. This acidifying effect was also reported by a set of studies conducted in Uruguayon an experimental site, ten years after the original vegetation was replaced by Eucalyptus plantation Pérez Bidegain et al, 2001;Sicardi et al, 2004).…”

Section: Discussionmentioning

confidence: 69%

Changes in Soil Ph, Polyphenol Content and Microbial Community Mediated by Eucalyptus Camaldulensis

Soumaré¹,

Sall

Sanon³

et al. 2016

Appl Ecol Env Res

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Abstract. Eucalyptus camaldulensis has been the main exotic species planted in reforestation programs in the tropics due to its fast growth and adaptability to climate variations. Based on the premise that the conversion from natural grazed pastures to commercial Eucalyptus plantations generates significant changes in soil properties, we assessed the impact of this exotic plantation on soil chemical and biological indicators. The study was conducted in 6 plantations across Senegal following a decreasing rainfall gradient from south to north. The plantations were divided in three lots according to their age: young plantations (established in 2003, 6 years old); intermediate plantations (established in 1998, 11 years old) and old plantations (established in 1982 and 1983, 26 years old). Our results clearly showed that E. camaldulensis plants significantly modified soil pH and soil bacterial community at all sites regardless of the age of the plantation. Microbial biomass (assessed by substrate-induced respiration), community structure (assessed by denaturing gradient gel electrophoresis profiles) and function (assessed by Catabolic Response Profile using different substrates) were all significantly decreased. The acidifying effect of E. camaldulensis, the effect of high level of polyphenols and their impact on microbial communities and ecosystem functioning were discussed.

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Section: Discussionmentioning

confidence: 69%

Changes in Soil Ph, Polyphenol Content and Microbial Community Mediated by Eucalyptus Camaldulensis

Soumaré¹,

Sall

Sanon³

et al. 2016

Appl Ecol Env Res

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“…Despite the quick response of soil fauna to changes in land-use and management, they are also very responsive to seasonality and climatic variations (Sicardi et al, 2004), thus indicating the necessity of a closer monitoring. In addition, the inference of an interpretative value for biological attributes is not an easy task due to the huge amount of influences on soil organisms.…”

Section: Faunal Indicatorsmentioning

confidence: 99%

“…They are involved in several metabolic processes and are also responsive to changes in soil use and management (Nannipieri et al, 2002;Acosta-Martínez et al, 2007). Enzymes are catalysts in different reactions during carbon and nutrient cycling in soil (Balota et al, 2004;Sicardi et al, 2004), and also represent the metabolic level of the soil microbial community. They may be free in soil as exoenzymes excreted by plants, animals, and mainly microorganisms (Weaver et al, 1994), linked to cell structures or internally in cells, but later released to the soil after cell lysis and death (Badiane et al, 2001).…”

Section: Microbiological and Biochemical Indicatorsmentioning

confidence: 99%

“…The soil microbial biomass is the living part of the soil organic matter, formed by fungi, bacteria, protozoa, and algae, and represents an important source of nutrients that may supply plant demands due to its rapid cycling (Sicardi et al, 2004), being one of the main biological attributes used in soil health studies.…”

Section: Microbiological and Biochemical 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.)

408

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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“…Deforestation followed by afforestation with fast-growing tree species, such as Eucalyptus, is one of the most significant ecological changes occurring in China and around the world (Sicardi et al 2004;Berthrong et al 2009;Ma et al 2010;Iovieno et al 2010). The environmental impacts of plantations are garnering increased attention partly because fast-growing tree species can adversely affect soil carbon and nutrient pools, thereby changing microbial properties (Chen et al 2004;Xu et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Non-linear impacts of Eucalyptus plantation stand age on soil microbial metabolic diversity

et al. 2013

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Purpose Although it is generally accepted that planting exotic plant species alters metabolic function of soil microbial communities, its temporal dynamic is often ignored when evaluating ecological effects of associated land use changes. To investigate the dynamic impacts of successive Eucalyptus planting on carbon metabolic activities of soil microbial communities, we studied community-level physiological profiles of soil microbial communities in different generations of Eucalyptus plantations. Materials and methods We studied community-level physiological profiles of soil microbial communities, using the Biolog™ Ecoplates incubation, in adjacent first (G1), second (G2), third (G3), and fourth (G4) generation Eucalyptus plantations that were, respectively, aged 3, 8, 14, and 19 years in Guangxi province, southern China. We used the 'space-fortime substitution' approach to investigate the impact of stand age of exotic Eucalyptus plantations on carbon metabolic diversity and activities of soil microbial communities. For each Eucalyptus plantation generation, three experimental plots were randomly selected. In each plot, one composite soil sample from 0 to 10 cm in depth was obtained for the analyses. Results and discussion Single carbon source utilization varied with Eucalyptus plantation stand age. Among preselected 31 carbon sources, utilization of 17 carbon sources changed significantly, which was best described by a quadratic function (ten carbon sources) and an exponential function (seven carbon sources). As a result, cumulative averaged metabolic activity and metabolic diversity of soil microbial communities showed quadratic and exponential changes relative to Eucalyptus plantation stand age. The order of cumulative averaged carbon metabolic activity and metabolic diversity were G1>G4, G3>G2 and G1>G2>G3, G4 (p<0.05), respectively. The factors contributing to carbon source utilization structure of soil microbial communities for different stand ages of Eucalyptus plantations were shrub richness, soil organic carbon content, microbial biomass carbon, C-to-N ratio, and N-to-P ratio. Conclusions Eucalyptus plantation stand age has inconsistent non-linear impacts on two aspects of soil microbial metabolic function: (1) quadratic impacts on carbon metabolic efficiency and (2) exponential impacts on carbon metabolic diversity. The decreasing carbon metabolic diversity has no significant impact on carbon metabolic efficiency during successive Eucalyptus plantings. The results show that the importance of assessing long-term impacts of land use changes on soil microbial communities from exotic plantations by quantifying multi-aspect non-linear changes on soil microbial metabolic function.

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Soil microbial indicators sensitive to land use conversion from pastures to commercial Eucalyptus grandis (Hill ex Maiden) plantations in Uruguay

Cited by 111 publications

References 18 publications

Changes in Soil Ph, Polyphenol Content and Microbial Community Mediated by Eucalyptus Camaldulensis

Changes in Soil Ph, Polyphenol Content and Microbial Community Mediated by Eucalyptus Camaldulensis

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

Non-linear impacts of Eucalyptus plantation stand age on soil microbial metabolic diversity

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