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It has all to do with litter content. When grass plants die, they create a mat of dead plant material known as "trash" or "litter." Too much litter repels water, drying out the soil; it also reduces soil temperature and prevents sunlight from reaching the soil surface. This can reduce biodiversity in the stand. Biodiversity is also reduced when dominant grasses are not grazed heavily enough to reduce their competitiveness with lesser-competitive plant species. Lastly, soil microbial populations reduce in population size and/or go dormant because soil is too cool.

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