Integrated chemo-phyto-ecological process for the treatment of polymetal contamination in landfill sites and the consequent soil recovery

AbstractNortheastern Thailand relies on agriculture as a major economic activity, and has used high levels of agrochemicals due to low facility, and salty sandy soil. To support soil recovery and sustainable agriculture, local farmers have used organic fertilizers from farmed animal feces. However, knowledge about these animal fecal manures remains minimal restricting their optimal use. Specifically, while bacteria are important for soil and plant growth, an abundance and a diversity of bacterial composition in these animal fecal manures have not been reported to allow selection and adjustment for a more effective organic fertilizer. This study thereby utilized metagenomics combined with 16S rRNA gene quantitative PCR (qPCR) and sequencing to analyze quantitative microbiota profiles in association with nutrients (N, P, K), organic matters, and the other physiochemical properties, of the commonly used earthworm manure and other manures from livestock animals (including breed and feeding diet variations) in the region. Unlike the other manures, the earthworm manure demonstrated more favorable nutrient profiles and physiochemical properties for forming fertile soil. Despite low total microbial biomass, the microbiota were enriched with maximal OTUs and Chao richness, and no plant pathogenic bacteria were found based on the VFDB database. The microbial metabolic potentials supported functions to promote crop growth, such as C, N and P cyclings, xenobiotic degradation, and synthesis of bioactive compounds. Pearson’s correlation analyses indicated that the quantitative microbiota of the earthworm manure were clustered in the same direction as N, and conductivity, salinity, and water content were essential to control the microbiota of animal manures.

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Ingestion of anthropogenic materials by yellow-legged gulls (Larus michahellis) in natural, urban, and landfill sites along Portugal in relation to diet composition

Environmental Science and Pollution Research ◽

10.1007/s11356-020-12161-5 ◽

2021 ◽

Author(s):

Catarina S. Lopes ◽

Vitor H. Paiva ◽

Patrícia T. Vaz ◽

Joana Pais de Faria ◽

Joana G. Calado ◽

...

Keyword(s):

Diet Composition ◽

Landfill Sites ◽

Larus Michahellis

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Environmental risk characterization and ecological process determination of bacterial antibiotic resistome in lake sediments

Environment International ◽

10.1016/j.envint.2020.106345 ◽

2021 ◽

Vol 147 ◽

pp. 106345

Author(s):

Haiyang Chen ◽

Chang Liu ◽

Yanguo Teng ◽

Zulin Zhang ◽

Yihan Chen ◽

...

Keyword(s):

Lake Sediments ◽

Environmental Risk ◽

Risk Characterization ◽

Ecological Process

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A Social-Ecological, Process-Oriented Perspective on Political Violence and Child Development

Child Development Perspectives ◽

10.1111/cdep.12067 ◽

2014 ◽

Vol 8 (2) ◽

pp. 82-89 ◽

Cited By ~ 27

Author(s):

E. Mark Cummings ◽

Marcie C. Goeke-Morey ◽

Christine E. Merrilees ◽

Laura K. Taylor ◽

Peter Shirlow

Keyword(s):

Child Development ◽

Political Violence ◽

Ecological Process ◽

Social Ecological ◽

Process Oriented

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Earthworms as an Ecological Indicator of Soil Recovery after Mechanized Logging Operations in Mixed Beech Forests

Forests ◽

10.3390/f12010018 ◽

2020 ◽

Vol 12 (1) ◽

pp. 18

Author(s):

Hadi Sohrabi ◽

Meghdad Jourgholami ◽

Mohammad Jafari ◽

Farzam Tavankar ◽

Rachele Venanzi ◽

...

Keyword(s):

Soil Properties ◽

Soil Depth ◽

Biological Properties ◽

Economic Benefits ◽

Ecological Indicator ◽

Traffic Intensity ◽

Soil Biological Properties ◽

Density And Biomass ◽

Soil Recovery ◽

The Impact

Soil damage caused by logging operations conducted to obtain and maximize economic benefits has been established as having long-term effects on forest soil quality and productivity. However, a comprehensive study of the impact of logging operations on earthworms as a criterion for soil recovery has never been conducted in the Hyrcanian forests of Iran. The aim of this study was to determine the changes in soil biological properties (earthworm density and biomass) and its recovery process under the influence of traffic intensity, slope and soil depth in various intervals according to age after logging operations. Soil properties were compared among abandoned skid trails with different ages (i.e., 3, 10, 20, and 25 years) and an undisturbed area. The results showed that earthworm density and biomass in the high traffic intensity and slope class of 20–30% at the 10–20 cm depth of the soil had the lowest value compared to the other treatments. Twenty-five years after the logging operations, the earthworm density at soil depth of 0–10 and 10–20 cm was 28.4% (0.48 ind. m−2) and 38.6% (0.35 ind. m−2), which were less than those of the undisturbed area, respectively. Meanwhile, the earthworm biomass at a soil depth of 0–10 and 10–20 cm was 30.5% (2.05 mg m−2) and 40.5% (1.54 mg m−2) less than the values of the undisturbed area, respectively. The earthworm density and biomass were positively correlated with total porosity, organic carbon and nitrogen content, while negatively correlated with soil bulk density and C/N ratio. According to the results, 25 years after logging operations, the earthworm density and biomass on the skid trails were recovered, but they were significantly different with the undisturbed area. Therefore, full recovery of soil biological properties (i.e., earthworm density and biomass) takes more than 25 years. The conclusions of our study reveal that the effects of logging operations on soil properties are of great significance, and our understanding of the mechanism of soil change and recovery demand that harvesting operations be extensively and properly implemented.

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Evaluation of Leaf Litter Mulching and Incorporation on Skid Trails for the Recovery of Soil Physico-Chemical and Biological Properties of Mixed Broadleaved Forests

Land ◽

10.3390/land10060625 ◽

2021 ◽

Vol 10 (6) ◽

pp. 625

Author(s):

Meghdad Jourgholami ◽

Azadeh Khoramizadeh ◽

Angela Lo Monaco ◽

Rachele Venanzi ◽

Francesco Latterini ◽

...

Keyword(s):

Soil Properties ◽

Soil Compaction ◽

Biological Properties ◽

Soil Protection ◽

Natural Soil ◽

Compacted Soils ◽

Beneficial Effects ◽

Physico Chemical ◽

Forest Logging ◽

Soil Recovery

Engineering applications can be used to mitigate the adverse effects of soil compaction and amend compacted soils. Previous literature has highlighted the beneficial effects of interventions such as litter mulching and incorporation on skid trails. However, little is known about the effectiveness of these alternatives in restoring forest soil quality after forest logging. The objective of this study was to properly elucidate the effects of the above mentioned soil protection methods, litter incorporation before skidding (LI) and litter mulching after skidding (LM), on the recovery of compacted soil’s physico-chemical and biological properties on skid trails over a 2-year period in the Hyrcanian forests of Iran to identify the best option for restoration intervention. The litter used in both methods consisted of dried leaves of the hornbeam and maple tree in three intensities of 3, 6, and 9 Mg ha−1. The results showed that the application of both methods (LI and LM) significantly improved the soil properties when compared to the untreated skid trail. Results showed that the recovery values of soil properties in the LI treatments were significantly higher than those of the LM. The recovery values of soil properties by 6 and 9 Mg ha−1 were significantly higher than those of 3 Mg ha−1, while the differences were not significant between 6 and 9 Mg ha−1. Our findings showed that soil properties were partially recovered (70–80%) over a 2-year period from treatment, compared to untreated, but the full recovery of soil properties required more time to return to the pre-harvest value. Overall, the results of this study demonstrated that the application of soil protection methods accelerates the process of recovering soil properties much faster than natural soil recovery, which can take more than 20 years in these forests.

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