Sensitivity of Soil Enzyme Activities to Conservation Practices

Bergstrom, D. W.; Monreal, Carlos M.; King, D. J.

doi:10.2136/sssaj1998.03615995006200050020x

Cited by 186 publications

(108 citation statements)

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“…Thus, changes in enzyme abundance and or activity may affect soil ecosystem functioning. Enzyme activity is related to soil properties like moisture and organic matter content [34,35] and it is also influenced by management practices [36e39]. The results obtained in this study, although being able, in some circumstances, to show differences between land-use practices, reflected more the variations of microbial activity among seasons.…”

Section: Discussionmentioning

confidence: 73%

Influence of seasons and land-use practices on soil microbial activity and metabolic diversity in the “Montado ecosystem”

Costa¹,

Freitas²,

Sousa³

2013

European Journal of Soil Biology

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a b s t r a c tThe "Montado ecosystem" is important both economically and ecologically; this ecosystem is dominated by cork and holm oak trees (Quercus suber L. and Quercus rotundifolia Lam. respectively) combined with a rotation of crops/fallow/pastures. Diverse management strategies, deviating from the sustainable use of the ecosystem, have been implemented, from which arise some extreme situations of over-use or abandonment. To evaluate the effects of different soil use and management, namely extensive cropping, intensive pasture and abandonment, in the activity of soil microorganisms, dehydrogenase, acid phosphatase, b-glucosidase and urease activities, N-mineralization and nitrification rates were measured in different land-use practices, in different seasons (winter, spring and autumn). Also, the potential metabolic diversity was evaluated by analysis of community-level physiological profiles (CLPPs). Seasonal effects were evident with maximum activity occurring in rainy seasons (winter and autumn) and lower substrate utilization in winter. Significant correlations between most microbial parameters and soil water content reflect this seasonal effect. Although showing mainly a seasonal change, microbial parameters were able to distinguish the abandoned area, with a general low activity and differential exponential rates in the use of several substrates, such as amino acids, miscellaneous and polymers, probably associated with changes in organic matter quality.

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Section: Discussionmentioning

confidence: 73%

Influence of seasons and land-use practices on soil microbial activity and metabolic diversity in the “Montado ecosystem”

Costa¹,

Freitas²,

Sousa³

2013

European Journal of Soil Biology

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“…It is sensitive to environmental changes caused by soil management (Kuperman & Carreiro, 1997;Bergstrom et al, 1998;Nannipieri & Gianfreda, 1998;Leirós et al, 1999;Bandick & Dick, 1999;Ndiaye et al, 2000;Madejón et al, 2001). Soil β-glucosidase is usually adsorbed on the surface of mineral particles and organic material in soil, and the heterogeneous nature of soil affects the kinetic diversity of immobilized enzymes (Skujins, 1976;Hayano & Katami, 1977).…”

Section: Introductionmentioning

confidence: 99%

Kinetic parameters of soil β-glucosidase response to environmental temperature and moisture regimes

Zhang¹,

Chen²,

Wu³

et al. 2011

Rev. Bras. Ciênc. Solo

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Soil β-glucosidase participates in the final step of cellulose biodegradation. It is significant in the soil C cycle and is used as an indicator of the biological fertility of soil. However, the response of its kinetic parameters to environmental temperature and moisture regimes is not well understood. This study tested the β-glucosidase response in the main agricultural soils (black soil, albic soil, brown soil, and cinnamon soil) of Northeast China. Incubation tests were conducted to measure the kinetic parameters Km, Vmax or Vmax/Km of soil β-glucosidase at environmental temperatures of 10, 20 and 30 ºC and at 10, 20 and 30 % soil moisture content. The insensitive response of the kinetic parameters to temperature changes indicates that soil β-glucosidase was present primarily in immobilized form. The significant response of the kinetic parameters of soil β-glucosidase to soil moisture rather than to environmental temperatures suggests that the catalytic ability of soil β-glucosidase was sensitive to changing soil moisture regimes.

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“…Soil structured communities could react differently and, what is more, be pre-adapted to glyphosate application (Haney et al, 2000;Bergstrom et al, 1998;Puglisi et al, 2006;Caravaca et al, 2002;Zabaloy et al, 2008). Regardless of the exact mechanism that underlies this complex phenomenon, our work points out the major nutrients (C, N, P, K, Ca) from organic sources, which support higher rates of metabolic pathway activities in microorganisms.…”

Section: Microbial Respiration Ratementioning

confidence: 78%

The impact of glyphosate herbicides on soil microbial activity from the Carajás National Forest

Castilho¹,

Viana²,

Santos³

et al. 2016

RCA

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KEYWORDS Bioindicators Invasive plants Microbial respiration rate Metabolic quotient PALAVRAS-CHAVE Bioindicadores Plantas invasoras Taxa de respiração microbiana Quociente metabólico ABSTRACT:The objective of this study was to evaluate the impact of different glyphosate-based herbicide formulations on microbial activity of soils from Carajás National Forest. We tested three formulations of glyphosate, i.e., Roundup Original  , Roundup Ultra  and Roundup WG  that were applied in five doses: 0; 240; 480; 720 and 1440 g of active ingredient in acid equivalent ha -1 , with four replications. Herbicides were sprayed on pots containing 500 g of soil derived from the 0-10 cm layer of the study site. We determined the carbon from microbial biomass (C-MB), microbial respiration rate (MR) and metabolic quotient (qCO 2 ) at one and 28 days after herbicide application. No treatment affected the C-MB and MR at one and 28 days of incubation. There was no difference for qCO 2 at any dose of Roundup Ultra  and WG  formulations at one and 28 days of incubation. However, the qCO 2 was inhibited by the Roundup Original  at one day post treatment. This parameter was normalized at 28 days after herbicide application. The data indicate that no one of the treatments tested cause significant impact on soil microorganisms of the Carajás National Forest, suggesting that herbicide-based invasive weed control could be used. RESUMO: Objetivou-se com este estudo avaliar o impacto de diferentes formulações de herbicidas à base de glyphosate na atividade microbiana de solo da Floresta Nacional de Carajás. Foram testadas três formulações comerciais de glyphosate (Roundup Original

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Sensitivity of Soil Enzyme Activities to Conservation Practices

Cited by 186 publications

References 0 publications

Influence of seasons and land-use practices on soil microbial activity and metabolic diversity in the “Montado ecosystem”

Influence of seasons and land-use practices on soil microbial activity and metabolic diversity in the “Montado ecosystem”

Kinetic parameters of soil β-glucosidase response to environmental temperature and moisture regimes

The impact of glyphosate herbicides on soil microbial activity from the Carajás National Forest

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