There is more to autumn than the colors produced by leaves in their dying phase. That process also leads to unique forms and textures. It also leads to not just vibrant yellows and oranges and reds against a darker muted background which is much different that the mid summer green agains such a background. Ansel Adams was a master of separating these different colors through contrast. He was a master at pre visualizing the effects of color filters on the scene and separating the colors using form and contrast by the use of filters.
For example the bright yellows, oranges and reds coveted in fall colors shots - Adams would turn into a glowing shimmering contrasting highlight by separating the colors in tonality using filters. Minor White shared this same approach. In fact Minor White would often use IR film to lighten the foliage in his B&W shots.
Here are some classic examples of this technique.
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www.randybottphotography.com/gallery/influence-of-ansel-adams-in-black-and-white-photography/