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The environmental performance of protecting seedlings with plastic tree shelters for afforestation in temperate oceanic regions: A UK case study
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This study looked at whether the plastic tubes used to protect young trees during forest restoration are worth their environmental cost, and found that skipping the plastic shelters altogether is actually better for the planet overall. If shelters must be used, regular plastic (polypropylene) beats "eco-friendly" bio-based plastics, and recycling the shelters afterward is the best disposal option, though the good news is that any carbon footprint from these plastics is tiny compared to how much carbon a growing tree soaks up over 25 years. While this study didn't directly measure microplastic pollution from degrading shelters, it's a reminder that even "
Restoration of forested land represents an effective strategy to achieve net-zero target emissions by enhancing the removal of greenhouse gases from the atmosphere. The most common afforestation strategy envisages planting seedlings, which are germinated and grown to the desired age at tree nurseries, with plastic shelters to increase growth and survival of trees. This article presents a comprehensive Life Cycle Assessment (LCA) study that compares the environmental performance of current and prospective scenarios for shelter-aided seedling planting compared with a base case where shelters are not employed. The study focuses on the UK, but results and conclusions are valid for other temperate oceanic regions. The scenarios investigated are a combination of different shelters materials and end-of-life (EoL) strategies. Our analysis demonstrates that (i) planting seedling without shelters is the most preferable option across most environmental impact categories (including Climate Change), and in terms of weighted results, (ii) polypropylene shelters are preferable to bio-based alternatives, including polylactic acid-starch blends and bio-polypropylene, (iii) recycling is the most environmentally advantageous EoL treatment. Our study also showed that that the carbon emissions of the scenarios investigated are negligible when compared to the amount of carbon sequestered by a tree in 25 years.
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Data from: The impact of biodegradable microplastics on soil priming effects in poplar shelterbelts across an afforestation gradient
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"Biodegradable" plastics, often used in farming, are marketed as an eco-friendly alternative to regular plastic, but this study found that as they break down in tree-planted soils, they can actually cause soil to release more stored carbon into the air—especially in forests planted 10-15 years ago. This matters because these soils are meant to act as carbon storage that helps fight climate change, and losing that stored carbon could undercut the environmental benefits these tree plantings were designed to provide.
Assessing the feasibility of mechanical recycling for plastic tree shelters used in agriculture and forestry: degradation and contamination of waste
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Researchers assessed the feasibility of mechanically recycling used polypropylene plastic tree shelters from European agriculture and forestry, evaluating polymer degradation and contamination by microplastics, additive residues, and pesticides in aged shelter waste. They found that while external surfaces showed degradation, bulk material quality was generally sufficient for mechanical recycling, with pesticide contamination levels presenting manageable challenges for most standard recycling processes.
Biodegradable microplastics can cause more serious loss of soil organic carbon by priming effect than conventional microplastics in farmland shelterbelts
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Researchers compared the effects of biodegradable microplastics (polylactic acid) and conventional microplastics (polyethylene, polypropylene) on soil organic carbon loss through the priming effect in farmland shelterbelts. Biodegradable microplastics caused greater soil organic carbon loss than conventional microplastics, challenging the assumption that biodegradable alternatives are automatically less harmful to soil carbon stocks.
Uptake and physiological impacts of nanoplastics in trees with divergent water use strategies
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Researchers studied how nanoplastics are taken up by tree roots and whether this uptake affects tree health and function. They found that trees did absorb nanoplastics through their root systems, and the particles caused oxidative stress and reduced photosynthetic capacity. The study suggests that plastic pollution in soil could impair the functioning of trees, which play a critical role in carbon sequestration and ecosystem health.
Urban trees as natural interceptors for aerial microplastics: Mechanisms, influencing factors, and selection of tree types for mitigation
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This meta-analysis found that urban trees intercept aerial microplastics through surface adhesion and chemical bonding, with fiber-shaped polypropylene particles under 1 mm most commonly captured on leaves. Indigenous evergreen species emerged as the most effective tree type for microplastic mitigation, and rainfall facilitates continuous interception cycles by washing particles from leaf surfaces.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.