Effects of plastic contamination on water evaporation and desiccation cracking in soil

Wan, Yong; Wu, Chenxi; Xue, Qi‐Kun; Hui, Xinminnan

doi:10.1016/j.scitotenv.2018.11.123

Cited by 442 publications

(135 citation statements)

References 41 publications

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“…Shoot and to some extent root mass were affected by microfilm concentration in a pattern opposite to that of microfibers. The decrease in shoot and root mass with microfilm concentration may be due to the creation of more channels for water movement, increasing the rate of soil evaporation 38 . This water shortage could explain the reduction in shoot mass growth, which in our case was more evident with polypropylene (PP) and polyethylenterephthalat (PET) films.…”

Section: Different Microplastic Shapes Increased Shoot and Root Biomassmentioning

confidence: 99%

Microplastic shape, concentration and polymer type affect soil properties and plant biomass

Lozano

Lehnert

Linck

et al. 2020

Preprint

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Microplastics are an increasing concern in terrestrial systems. These particles can be incorporated into the soil in a wide range of shapes and polymers, reflecting the fact that manufacturers produce plastics in a variety of physical and chemical properties matching their intended use.Despite of this, little is known about the effects that the addition into the soil of microplastics of different shapes, polymer type and concentration levels may have on soil properties and plant performance.To fill this gap, we selected four microplastic shapes: fibers, films, foams and fragments; and for each shape we selected three microplastics made of one of the following polymers: polyester, polyamide, polypropylene, polyethylene, polyethylenterephthalat, polyurethane, polystyrene and polycarbonate. In a glasshouse experiment, each microplastic was added to a soil from a dry grassland at a concentration of 0.1%, 0.2%, 0.3% and 0,4%. A carrot (Daucus carota) plant grew in each pot during four weeks. At harvest, shoot and root mass, soil aggregation and microbial activity were measured.Our results showed that all microplastic shapes increased shoot and root masses. As concentration increased, microfibers increased plant biomass probably as fibers may hold water in the soil for longer. In contrast, microfilms decreased biomass with concentration, likely because they can create channels in the soil that promote water evaporation affecting plant performance. All microplastic shapes decreased soil aggregation, probably since microplastics may introduce fracture points in the aggregates affecting their stability and also due to potential negative effects on soil biota. The latter may also explain the decrease in microbial activity with, for example, polyethylene films. Similar to plant biomass, microfilms decreased soil aggregation with increasing concentration.Our study tested the microplastic shape mediation and dissimilarity hypotheses, highlighting the importance of microplastic shape, polymer type and concentration when studying the effects of microplastics on terrestrial systems.

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Section: Different Microplastic Shapes Increased Shoot and Root Biomassmentioning

confidence: 99%

Microplastic shape, concentration and polymer type affect soil properties and plant biomass

Lozano

Lehnert

Linck

et al. 2020

Preprint

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“…It is possible that the soil wrapped the seed and MP together with no movement and therefore the MP continued to block the pores. Wan et al [30] reported that plastics could lead to the formation of channels in the soil, which could, in turn, lead to faster drying. This could have a negative impact not only on the water availability for germinating seed but also on the soil microbe composition [30] and may have been another factor contributing to the continued inhibition seen in the present study.…”

Section: Germination In a Substrate-system With Mp Granulesmentioning

confidence: 99%

The Influence of New and Artificial Aged Microplastic and Leachates on the Germination of Lepidium sativum L.

Pflugmacher

Sulek

Mader

et al. 2020

Plants

101

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With the increase in environmental monitoring and assessing, we are gaining insight into the extent of microplastic pollution in our environment. The threat posed by microplastics to biota could come, e.g., from leached substances. As some plastic materials have been decaying in nature for extended periods already, the toxic effects of leaching compounds need to be investigated. It is furthermore essential to understand the adverse effects of new plastic and how these effects differ from the effects elicited by old plastic material. Therefore, in the present study, the effects of exposure to leachates from new and artificial aged polycarbonate as well as new and aged polycarbonate granules on various germination parameters of Lepidium sativum were studied. Germination, root, and shoot length, as well as the calculated germination rate index as a measure for germination speed, was negatively influenced in substrate-free and substrate containing exposures. From an ecological and agricultural point of view, this implies possible yield losses with less germinating seeds, slower plant germination speed, and smaller seedlings in general.

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“…Krisnanto et al [20] proposed a model to predict the lateral flow rate through a network of cracks in the soils. Wan et al [21] proved that field crack systems may potentially create convectively-driven "hotspots" of enhanced water and carbon gas transport in dryland ecosystems as a result of crack formation.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Spectral Characteristics and Physicochemical Parameters of Soda-Saline Soils in Different States

Ren

Zhao

et al. 2019

Remote Sensing

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The spectral features of soils are a comprehensive representation of their physicochemical parameters, surface states, and internal structures. To date, spectral measurements have been mostly performed for powdered soils and smooth aggregate soils, but rarely for cracked soils; a common state of soda-saline soils. In this study, we measured the spectral features of 57 saline soil samples in powdered, aggregate, and cracked states for comparison. We then explored in depth the factors governing soil spectral features to build up simple and multiple linear regression models between the spectral features and physicochemical parameters (salt content, Na+, pH, and electronic conductivity (EC)) of saline soils in different states. We randomly selected 40 samples to construct the models, and used the remaining 17 samples for validation. Our results indicated that the regression models worked more effectively in predicting physicochemical parameters for cracked soils than for other soils. Subsequently, the crack ratio (CR) was introduced into the regression models to modify the spectra of soils in powdered and aggregate states. The accuracy of prediction was improved, evidenced by a 2–11% decrease in the parameters mean absolute error (MAE).

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Effects of plastic contamination on water evaporation and desiccation cracking in soil

Cited by 442 publications

References 41 publications

Microplastic shape, concentration and polymer type affect soil properties and plant biomass

Microplastic shape, concentration and polymer type affect soil properties and plant biomass

The Influence of New and Artificial Aged Microplastic and Leachates on the Germination of Lepidium sativum L.

Correlation between Spectral Characteristics and Physicochemical Parameters of Soda-Saline Soils in Different States

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