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Chris,
UV filter glass would help a little, but don't expect miracles from it. If you want to leave parts of the ground showing, it might be better to color it with acrylic paints or gesso mixed with acrylic paints whose pigments are rated as ASTM Lightfastness I before painting over it in pastel. Golden makes a toothy gesso especially for pastels that looks to me to be a very good product. Before I'd trust any pastel paper not to fade, I'd test it to see, by putting a sample of it in a south-facing window for a year or so, with half of it covered with a black mask, and the other half exposed. Things can change drastically in 50-100 years in normal light that do not show up so noticeably in just a few years. Direct sun is a good accelerated-aging test for lightfastness.
Virgil Elliott
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