Microbial extracellular enzymes in biogeochemical cycling of ecosystems

Luo, Ling; Meng, Han; Gu, Ji‐Dong

doi:10.1016/j.jenvman.2017.04.023

Cited by 216 publications

(82 citation statements)

References 86 publications

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“…We indeed found the CPF had a higher topsoil pH than the NSF, however, vector A between NSF and CPF in the topsoil did not show a significant difference. Furthermore, the lower enzymatic N/P and C/P ratios were both <1 at all depths indicating P limitation in the the two forests [4,52]. A gradual decrease of vector A in the CPF indicated that microbial P limitation was gradually reduced along soil depth.…”

Section: Enzymatic Stoichiometry and Microbial Nutrient Limitationsmentioning

confidence: 96%

Enzyme stoichiometry indicates the variation of microbial nutrient requirements at different soil depths in subtropical forests

Liu

Chen

et al. 2020

PLoS ONE

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Soil extracellular enzyme activities and associated enzymatic stoichiometry are considered sensitive indicators of nutrient availability and microbial substrate limitation. However, many of previous studies have been focusing on uppermost soil layer with a single enzyme as representative of the whole nutrient acquisition, leading to critical uncertainties in understanding soil nutrient availability and its relationship with microbial activities in deeper soils. In the current study, we investigated C-, N-and P-acquiring enzyme activities across a range of soil layers (0-10, 10-20, 20-40 and 40-60 cm), and examined the microbial C, N and P limitation in natural secondary forests (NSF) and Chinese fir (Cunninghamia lanceolata) plantation forests (CPF) in subtropical China. The results showed that microbial C and P colimitation was detected in the two typical subtropical forests at all soil depths, rather than microbial N limitation. Microbial C and P limitation fluctuated along soil depth, but higher N was demanded by microbes in soil under 20 cm in both forests. The present results highlight the asymmetrical patterns of microbial nutrient limitation along the whole soil profile, and provide essential information in understanding nutrient limitations in deeper soils. These vertical and asymmetrical nutrient limitation patterns should be incorporated into future research studies priority.

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Section: Enzymatic Stoichiometry and Microbial Nutrient Limitationsmentioning

confidence: 96%

Enzyme stoichiometry indicates the variation of microbial nutrient requirements at different soil depths in subtropical forests

Liu

Chen

et al. 2020

PLoS ONE

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“….83 x105 cfu/g soil and from 1.70 x10 5 -2.16 x 10 5 cfu/g soil in paraquat treated soil. The variation in nitrifying bacterial count with respect to different pesticides and days was significant at P=0.05 value.…”

mentioning

confidence: 94%

“…Soil biochemical assays have been used to analyse soil fertility or productivity, microbial biomass [2] and effects of toxicants. Also, soil enzymes have been used to monitor biogeochemical cycling [3,4], total microbial activity, predict bioremediation alongside its potential success, to understand rhizosphere effect and a potential indicator of soil quality [5].…”

Section: Introductionmentioning

confidence: 99%

Impact of Pesticides on Microbial Diversity and Enzymes in Soil

Ataikiru

Okpokwasili

Okerentugba

2019

SAJRM

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Introduction: The presence of pesticides in soils could result in alterations in microbial activities (enzyme activities, microbial populations), soil physical and chemical properties. Research gap/Challenges: Insufficient literatures on extensive monitoring of soil quality through enzyme activity, during pesticides application. Existing literatures concerning analysis of effect of pesticide application on soil enzyme activity are not comprehensive with respect to number of soil enzymes analysed. Aim/Objective: The study was conducted to investigate the effect of carbofuran and paraquat on soil biochemical characteristics on certain soils in the Niger Delta region of Nigeria. Methodology: These pesticides were applied at recommended doses, their effects on soil organic carbon, enzymes activity and microbial populations were assessed using standard methods. The enzymes monitored were amylase, invertase, protease, urease, phosphatase and dehydrogenase. Microbial counts were carried out for total heterotrophic bacteria, fungi, actinomycetes, nitrifying bacteria and phosphate solubilizers using the spread plate method. Results: There were variations in the different enzyme activities in carbofuran – and paraquat - treated soil during this research. Dehydrogenase activity increased in treated soils. Also, urease activity was lower compared to other enzyme activities. As the study progressed, variations in values of soil organic carbon were observed. There was a gradual increase in microbial counts and can be traceable to their ability to temporarily mineralize and use the pesticides as carbon and energy source. The soil organic carbon, enzymes and microbial counts values were significantly different at P=0.05. Conclusion: This research revealed that the pesticides cause temporal impact on microbial populations and enzyme activities, associated with the pesticide type at recommended field application rates. A change in numbers, activity and diversity of soil microorganisms may act as indicators of soil fertility and reflect the soil quality.

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“…Therefore, they play an important role in the soil carbon cycles [56,57]. Some hydrolases can catalyze the hydrolysis of polysaccharides, release monosaccharides, provide available carbon and energy support for life activities such as microorganisms, and thus affect plants growth [58][59][60]. Soil oxidoreductase can catalyze the redox reaction in soils and participate in soil carbon cycles.…”

Section: Effects Of Soil Enzyme Activities On the Soc Content And Minmentioning

confidence: 99%

Carbon Mineralization under Different Saline—Alkali Stress Conditions in Paddy Fields of Northeast China

Wang

Tang

et al. 2020

Sustainability

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Soil organic carbon (SOC) mineralization (conversion of carbonaceous material to carbon dioxide) plays a central role in global carbon cycle. However, the effects of SOC mineralization under different saline–alkali stress conditions are poorly understood. In order to understand the carbon mineralization processes, four paddy fields with different saline and alkali degrees were chosen as the experimental samples and the soil CO2 emission fluxes at nine different time steps of the whole simulation experiment were observed. The physical and chemical properties of soils of four field conditions were compared for the dynamic changes of CO2 flux in the progress of paddy field cultivation simulations. The results showed that the first three fields (P1, P2, and P3) were weakly alkaline soils and the last one (P4) was strongly alkaline soil. The SOC content of each plot was significantly different and there was a near-surface enrichment, which was significantly negatively correlated with the degree of alkalization. The accumulation process of the SOC mineralization during the incubation time was consistent with the first-order kinetic model. In the initial stage of mineralization, the amount of CO2 released massively, and then the release intensity decreased rapidly. The mineralization rate decreased slowly with time and finally reached a minimum at the end of the incubation period. This study indicates that the SOC mineralization process is affected by a variety of factors. The main factors influencing SOC mineralization in the saline–alkaline soils are the exchangeable sodium percentage (ESP), followed by enzyme activities. Salinization of the soils inhibits the rate of soil carbon cycle, which has a greater impact on the carbon sequestration than on the carbon source process. The intensity and completeness of the SOC mineralization reactions increase with increasing SOC contents and decrease with increasing ESP levels.

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Microbial extracellular enzymes in biogeochemical cycling of ecosystems

Cited by 216 publications

References 86 publications

Enzyme stoichiometry indicates the variation of microbial nutrient requirements at different soil depths in subtropical forests

Enzyme stoichiometry indicates the variation of microbial nutrient requirements at different soil depths in subtropical forests

Impact of Pesticides on Microbial Diversity and Enzymes in Soil

Carbon Mineralization under Different Saline—Alkali Stress Conditions in Paddy Fields of Northeast China

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