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Soil biodiversity supports agroecosystem services under multiple global change factors
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Scientists tested how wheat crops handle multiple stressors at once, like heat, drought, salty soil, pesticides, and microplastics, and found that having a rich variety of soil microbes and organisms helps farmland keep functioning even under these combined pressures. Interestingly, moderate stress sometimes boosted plant growth, but this often came at a cost to other important processes like nutrient cycling and beneficial plant-microbe partnerships. The takeaway: protecting soil biodiversity isn't just good for the environment, it's crucial for keeping our food supply stable as climate change and pollution (including microplastics)
Cereals are the key staple foods supporting a growing population under global change. Soil biodiversity sustains ecosystem multifunctionality (EMF) that underpin food production and soil agroecosystem services. Yet, the capacity of soil biodiversity to support EMF in cereal fields under multiple global change factors (GCFs) remains virtually unknown. Here, we conducted a field mesocosm experiment involving wheat, four levels of soil biodiversity, and up to eight distinct GCFs (warming, drought, salinity, heavy metals, nitrogen addition, microplastics, pesticides, and alkalinization) to investigate the contributions of soil biodiversity in supporting EMF (e.g., crop productivity, nutrient cycling, plant symbionts, plant health and organic matter decomposition) under multiple GCFs. Our results reveal that soil biodiversity maintains positive effects on EMF under increasing levels of GCFs. Intermediate levels of multiple GCFs stimulated vegetative wheat biomass, likely due to compensatory responses, but often at the expense of other soil ecosystem functions such as organic matter decomposition or the prevalence of plant symbionts, highlighting the inherent trade-offs under global change. These findings demonstrate that preserving soil biodiversity is essential to maintain agroecosystem functioning under multiple global change factors.
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Soil biodiversity supports agroecosystem services under multiple global change factors
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Scientists tested how well soil life (like microbes and worms) helps wheat crops stay healthy and productive when faced with multiple stresses at once, things like drought, heat, pollution, salt, and even microplastics. They found that having diverse, healthy soil biology helped crops cope better even under these combined stresses, though there were trade-offs: crops might grow more short-term but lose out on other benefits like nutrient recycling. The takeaway is that protecting soil biodiversity isn't just good for the environment, it's key to keeping our food supply stable as climate change and pollution intensify.
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Researchers investigated how multiple environmental stressors, including microplastics, climate change, and chemical pollution, affect soil health when they act together. The study found that the more different the stressors are in how they work, the more they amplify each other's harmful effects on important soil functions like decomposition and enzyme activity.
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Researchers found that drought conditions can actually alleviate the negative effects of microplastic pollution on soil micro-food web complexity and stability, suggesting these two environmental stressors interact in unexpected ways rather than simply compounding harm.
Soils from different landscape elements diverge in response to multiple global change factors
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Scientists tested how farmland, grassland, and forest soils from the same region reacted to stressors like warming, drought, pollution, and microplastics, and found each soil type responded in its own unique way, even under identical conditions. This matters because soil health underlies our food and water systems, and it means one-size-fits-all strategies for protecting soil from pollution and climate change won't work; instead, we need tailored approaches for different landscapes to keep growing healthy food and maintaining clean ecosystems as environmental pressures increase.
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Scientists found that tiny plastic particles in soil become more harmful to the beneficial bacteria that keep soil healthy when combined with drought conditions. The smallest plastic particles caused the most damage, reducing the diversity of helpful soil bacteria by up to 29% during dry conditions. This matters because healthy soil bacteria are essential for growing nutritious food, and climate change is making both plastic pollution and droughts more common worldwide.
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