Microbial Biomass and Community Structure in a Sequence of Soils with Increasing Fertility and Changing Land Use

Yao, Huaiying; He, Zhenli; Wilson, Marcelo Germán; Campbell, Colin D.

doi:10.1007/s002480000053

Cited by 375 publications

(113 citation statements)

References 48 publications

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“…Soil microbial communities are a key component of a healthy ecosystem, providing a number of ecosystem services including direct and indirect nourishments of plant root systems (Wall and Virginia, 1999, Yao et al, 2000, Kirk et al, 2004, Wahid et al, 2016). We detected significant responses of microbes at a community level to melatonin under normal or abiotic stress conditions in agricultural top-soils (10cm depth).…”

Section: Discussionmentioning

confidence: 99%

“…Soil microbial communities have an essential role in maintaining ecosystem health by direct exchange of nutrients and minerals with plants within the rhizosphere, as well as by providing nourishment to plants indirectly via nutrient cycling of organic matter (Wall and Virginia, 1999, Yao et al, 2000, Kirk et al, 2004, Wahid et al, 2016). Microbial community structures in soil can be altered by various abiotic stresses such as soil contaminants and salinity (Badri and Vivanco, 2009, Wood et al, 2016, Geisseler et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Bacterial and fungal communities are differentially modified by melatonin in agricultural soils under abiotic stress

Madigan

Egidi

Bedon

et al. 2019

Preprint

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An extensive body of evidence from this last decade indicates that melatonin enhances plant resistance to several biotic and abiotic stressors. This has led to an interest in the use of melatonin in agriculture to reduce negative physiological effects from environmental stresses that affect yield and crop quality. However, there are no reports regarding the effects of melatonin on soil microbial communities under abiotic stress, despite the importance of microbes for plant root health and function. Three agricultural soils associated with different land usage histories (pasture, canola or wheat) were placed under abiotic stress by cadmium (100 or 280 mg/kg) or salt (4 or 7 g/kg) and treated with melatonin (0.2 and 4 mg/kg). Automated Ribosomal Intergenic Spacer Analysis (ARISA) was used to generate Operational Taxonomic Units (OTU) for microbial community analysis in each soil. Significant differences in richness (α diversity) and community structures (β diversity) were observed between bacterial and fungal assemblages across all three soils, demonstrating the effect of melatonin on soil microbial communities under abiotic stress. The analysis also indicated that the microbial response to melatonin is governed by the type of soil and history. The effects of melatonin on soil microbes needs to be regarded in potential future agricultural applications.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bacterial and fungal communities are differentially modified by melatonin in agricultural soils under abiotic stress

Madigan

Egidi

Bedon

et al. 2019

Preprint

View full text Add to dashboard Cite

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“…Individual fatty acids have been used as signatures for various functional groups of microorganisms (Bardgett, Lovell, Hobbs, & Jarvis, 1999;Bossio, Scow, Gunapala, & Graham, 1998;Grayston, Griffith, Mawdsley, Campbell, & Bardgett, 2001;Pankhurst, Pierret, Hawke, & Kirby, 2002;Yao, He, Wilson, & Campbell, 2000). The i-15:0, a-15:0, i-16:0, i-17:0, and a-17:0 are classified as gram-positive bacteria while 16:1w7, 17:0cy, 2-OH 16:0, c18:1w7, and 19:0cy are classified as gram-negative bacteria, (Zelles, 1999).…”

Section: Phospholipid Fatty Acid (Plfa) Analysismentioning

confidence: 99%

Soil microbial community structure and enzymatic activity responses to nitrogen management and landscape positions in switchgrass (Panicum virgatumL.)

et al. 2019

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Switchgrass (Panicum virgatum L.) is usually grown on marginal land for biofuel system, in which nitrogen (N) is an essential management practice, and landscape position is a key topographical factor in impacting the production. However, limited information is available regarding how the N application and landscape positions affect soil microbial communities and enzyme activities under switchgrass. Thus, the specific objective of this study was to evaluate the responses of N rate (high, 112 kg N/ha; medium, 56 kg N/ha; and low, 0 kg N/ha) and landscape positions (shoulder and footslope) on soil biological health under switchgrass field. Data showed that N addition significantly influenced carbon and N fractions. The hot water‐soluble organic carbon (HWC) and nitrogen (HWN) fractions were significantly higher at footslope position than the shoulder position. The amount of total phospholipid fatty acid (PLFA), total bacterial, actinomycetes, gram‐negative and gram‐positive bacteria, total fungi, arbuscular mycorrhizal (AM) fungi, and saprophytes PLFAs were highest with medium and high N rates and footslope position. The N addition increased total PLFAs in N fertilizer treatments, viz. medium (5,946 ng PLFA‐C/g soil) and high N rates (5,871 ng PLFA‐C/g soil). Microbial biomass carbon and nitrogen and enzyme activities (urease, β‐glucosidase, acid phosphatase and arylsulfatase) were significantly enhanced by N fertilization (medium and high N rates) compared to control (low N rates) under footslope position. The urease activity under medium (36.3 µmol N‐NH4+ g−1 soil hr−1) and high N rates (31.4 µmol N‐NH4+ g−1 soil hr−1) was 42.9% and 23.6% higher than low N rates, respectively. This study suggests that the application of medium N rate in footslope position to switchgrass can enhance the soil biological properties and hence can protect the environment from the excessive use of N fertilizer.

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“…Compared to B1 and B2, a higher relative abundance of PLFA marker characteristic of actinomycetes has been detected at B4 but, in contrast, a significant lower one at B3. A higher relative abundance of actinomycetes in an eroded soil was observed by Yao et al (2000) for Chinese red soils. They also detected the widest G+/G-ratio in the eroded soil.…”

Section: Statisticsmentioning

confidence: 81%

Microbial activity and community structure in degraded soils on the Loess Plateau of China

Hamer

Makeschin

et al. 2009

Z. Pflanzenernähr. Bodenk.

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Soil erosion is the main process leading to soil degradation on the Loess Plateau of China. The effects of soil-erosion intensity (sheet, rill, and gully erosion) and different land use (140 y-old secondary forest site, 16 y-old bare site, 6 y-old succession site, and 43 y-old arable site) on gross and net N mineralization, soil organic-carbon (SOC) turnover, the size and structure of the soil microbial community (phospholipid fatty acid analysis) were assessed. Erosion intensity in the bare plot increased from top slope (sheet erosion) to down slope (gully erosion). The more severe the soil erosion the stronger was the decline of SOC, total N, and microbial biomass (MB). The MBC/SOC ratio decreased whereas the metabolic quotient (qCO 2 ) increased. Differences in nutrient turnover in the different erosion zones of the bare plot were not significant. The microbial community changed towards less Gram negative bacteria and relative more fungi in the gully-erosion zone. In forest soils, qCO 2 and the MBC/SOC ratio demonstrate a higher substrate-use efficiency of the microbial biomass than in bare soils. Gross N mineralization and gross NH þ 4 consumption clearly indicated a higher microbial activity in forest than in bare soils. Arable land use shifted the soil microbial community towards a higher relative abundance of fungi and a lower one of actinomycetes. During 6 y of natural succession on former bare plots, soil nutrient content and turnover as well as microbial biomass and structure developed towards forest conditions.

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Microbial Biomass and Community Structure in a Sequence of Soils with Increasing Fertility and Changing Land Use

Cited by 375 publications

References 48 publications

Bacterial and fungal communities are differentially modified by melatonin in agricultural soils under abiotic stress

Bacterial and fungal communities are differentially modified by melatonin in agricultural soils under abiotic stress

Soil microbial community structure and enzymatic activity responses to nitrogen management and landscape positions in switchgrass (Panicum virgatumL.)

Microbial activity and community structure in degraded soils on the Loess Plateau of China

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