Microbial biomass and activity in salt affected soils under arid conditions

Yuan, Bin; Li, Zizhen; Liu, Hua; Gao, Meng; Zhang, Yanyu

doi:10.1016/j.apsoil.2006.07.004

Cited by 348 publications

(167 citation statements)

References 41 publications

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“…4-5) showing that not only matric potential, but also osmotic potential affects microbial activity. The negative effect of salinity on microbial activity is in agreement with many other studies (Pathak and Rao, 1998;Rietz and Haynes, 2003;Yuan et al, 2007), but in most of these studies, only the EC is given. However, the EC is a poor measure of salinity stress to microbes, because it does not necessarily reflect the salt concentration in the soil solution.…”

Section: Discussionsupporting

confidence: 79%

Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential

Chowdhury¹

2015

International J. of Soil Science

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When conducting incubation experiments to measure soil respiration in response to a given treatment in soils of different texture, it is important to have baseline information about the soils and to ensure that the effect of the storage or pre-incubation conditions on the results are minimized. Three experiments were conducted with up to seven soils (3 non-saline, 4 saline) to investigate (1) The relationship between soil water content or water potential and soil respiration, (2) The time required until soil respiration is stabilized after rewetting of air-dry soil and (3) If pre-incubation at a given matric or osmotic potential changes the response of soil respiration to matric or osmotic potential. The texture of the soils varied from sand to sandy loam. Cumulative respiration showed an optimum curve in response to differential soil water content in all 7 soils, but the maximal cumulative respiration was reached at different water content in the soil, being 45 g kgG 1 for the non-saline sand and 200 g kgG 1 for the non-saline sandy loam. However, when expressed against water potential, maximal cumulative respiration was achieved between 0 and -1 MPa in all soils. Rewetting of air-dry soil induced a flush of respiration in the first 1-2 days, but respiration rates stabilized 7-8 days after rewetting in all soils. Pre-incubation at low matric or osmotic potential for two weeks did not significantly affect soil respiration at low matric or osmotic potential in the following two weeks compared to soils which had been pre-incubated at optimal matric potential and high osmotic potential. In conclusion, when comparing the response of respiration to water availability among soils of different texture it is important to consider water potential and not water content. Furthermore, an adaptation period of 2 weeks does not seem to increase the tolerance of soil respiration to low osmotic or matric potential compared to non-adapted soils.

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Section: Discussionsupporting

confidence: 79%

Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential

Chowdhury¹

2015

International J. of Soil Science

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“…Adviento-Borbe et al (2006), analyzing the effect of four levels of soil electrical conductivity (ECs) -0.5, 1.0, 1.5 and 2.0 dS m -1 -on soil microbial respiration, observed that this variable was reduced with the increase in electrical conductivity, mainly because of the osmotic stress. Yuan et al (2007), studying eleven soils with EC varying from 0.32 to 23.05 dS m -1 , aiming to account for the effects of salinity on the size, activity and structure of the community of soil microorganisms in arid soils in a Chinese province, observed a negative exponential relationship between the EC and the carbon of the microbial biomass, nitrogen of the microbial biomass and basal respiration of the soil.…”

Section: Resultsmentioning

confidence: 99%

Leaf gas exchange in cowpea and CO2 efflux in soil irrigated with saline water

Oliveira

Souza

Cunha

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TLeaf gas exchanges in plants and soil respiration are important tools for assessing the effects of salinity on the soil-plant system. An experiment was conducted with cowpea irrigated with saline water (0, 2.5, 5.0, 7.5, 10.0 and 12.5 dS m -1 ) prepared with two sources: NaCl and a mixture of Ca, Mg, Na, K and Cl ions in a randomized block design and a 6 x 2 factorial scheme, with four replicates, totaling 48 experimental plots. At 20 days after planting (DAP), plants were evaluated for net photosynthesis (A), stomatal conductance (gs) and transpiration (E) using the Infra-Red Gas Analyzer (Model XT6400-LICOR), and water use efficiency, intrinsic water use efficiency and instantaneous efficiency of carboxylation were calculated. At 60 DAP, the soil CO 2 efflux (soil respiration) was determined with a camera (Model 6400-09-LICOR). Salinity caused reductions in A, gs and E. However, the salt source did not have significant effect on these variables. Soil CO 2 efflux was reduced with the increase in the electrical conductivity, especially in the mixture of ions.Trocas gasosas em feijão-caupi e efluxo de CO 2 do solo irrigado com água salina R E S U M O As trocas gasosas em plantas e a respiração do solo são ferramentas importantes para avaliar os efeitos da salinidade no sistema solo-planta. Com este propósito conduziu-se um experimento com feijão-caupi irrigado com seis níveis de condutividade elétrica (0; 2,5; 5,0; 7,5; 10,0 e 12,5 dS m -1 ) elaborados com duas fontes: NaCl e uma mistura de íons de Ca, Mg, Na, K e Cl, em blocos ao acaso e arranjo fatorial 6 x 2, com 4 repetições totalizando 48 parcelas; aos 20 dias após o plantio (DAP) foram determinadas fotossíntese líquida (A), condutância estomática (gs) e transpiração (E) com o Infra-Red Gas Analyzer (Modelo XT6400-Licor) e se calcularam a eficiência do uso da água, a eficiência intrínseca do uso da água e a eficiência instantânea de carboxilação; aos 60 DAP determinou-se o efluxo de CO 2 (respiração do solo) com uma câmara de solo (Modelo 6400-09-LICOR). Observaram-se reduções de A, gs e E com o aumento da salinidade; entretanto, a fonte de sal não apresentou efeito significativo para tais variáveis; já para a respiração do solo ocorreu redução com o aumento da condutividade elétrica da água de irrigação sendo mais pronunciado quando se utilizou somente a mistura de sais.

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“…negative impact of soil salinization on soil microbial characteristic (biomass, qCo 2 ) was observed also in other studies. Yuan et al (2007) reported that higher salinity in arid soil in China resulted in a smaller, more stressed, microbial community, which was less metabolically efficient. restriction of microbial metabolism and C mineralization in salt-water wetland were detected also in Mamilov et al (2004).…”

Section: Resultsmentioning

confidence: 99%

Effects of road deicing salts on soil microorganisms

Anděl¹,

Černohlávková²,

Bartoš³

et al. 2008

PLANT SOIL ENVIRON

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ABSTRACTin this study, the effects of road salting on the quality of forest soils near the road were monitored in the Krkonoše Mountains (Czech republic). Physical, chemical properties and microbial parameters of soils were determined and the toxic potentials of soil water extracts were evaluated using the bacterial tests (Microtox and Pseudomonas putida growth inhibition test). increased concentrations of na + ions (up to 100 mg/kg) and pH values up to 8 were found closer to the road. Microbial biomass and respiration activity were significantly reduced at the roadside (anova; P < 0.05), and the metabolic quotients showed that the microbial community was apparently under stress. large stimulation of Pseudomonas putida growth was determined, especially for salinized samples closest to the road. oppositely, results showed the unsuitability of bacteria toxicity tests in such cases of pollution. assessment of intrinsic soil microbial communities is more ecologically relevant and shows the effects that cannot be detected by bacterial toxicity tests.

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Microbial biomass and activity in salt affected soils under arid conditions

Cited by 348 publications

References 41 publications

Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential

Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential

Leaf gas exchange in cowpea and CO2 efflux in soil irrigated with saline water

Effects of road deicing salts on soil microorganisms

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