North Fork Preservation AssociationWide variety of old-growth ecosystems across the US makes their conservation a complex challenge
What exactly is “old growth? This article adds some context to the discussion . . .
In an old-growth longleaf pine savanna, the absurdly long pine needles sing in the wind. Once considered forests, these landscapes in the southeastern U.S. coastal plain are open-canopied and sunny, more grassland than forest, with underbrush kept clear by frequent fires.
Longleaf pines – their needles can be up to 18 inches long – are among the longest-lived trees in eastern North America, surpassing 500 years if they are lucky enough to escape lightning strikes from the region’s frequent thunderstorms. Almost more fascinating is the ground cover, with up to 50 species per square meter, including some plants that are thousands of years old, with the vast majority of their biomass below ground. Picture an underground forest.
In the American West, there are other types of old-growth forest. Dry ponderosa pine woodlands are similarly open in structure and contain trees up to nearly 1,000 years old. But perhaps the most familiar old-growth forests are the complex, wet old-growth forests of the Pacific Northwest, which stretch from northwestern California to southeastern Alaska.
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