Clearcutting

A forest canopy does two jobs at once: it intercepts rain so it falls gently instead of pounding bare dirt, and tree roots hold soil particles together. Take every tree away at once and both protections vanish on the same day. Rain hits soil directly and runs off instead of soaking in, since there are no roots or leaf litter to slow it down. That runoff carries topsoil with it, and the nutrients bound in that topsoil leave with it too. Soil temperature rises because there's no shade, which speeds up decomposition and releases even more nutrients into water that's already moving fast toward a stream. Twenty kilometers downstream, all of that shows up as murky, sediment-loaded water.

Clearcutting, selective cutting, and strip cutting sit on a spectrum of how much forest you remove at once. Clearcutting takes everything. Selective cutting removes only chosen trees, often the oldest or most valuable, leaving the rest of the stand standing. Strip cutting clears narrow bands and leaves other strips intact, so seeds and shelter are never far away. Selective cutting sounds gentlest, but it isn't automatically so: if it requires cutting roads deep into untouched forest, or if loggers keep coming back for the biggest trees, it can fragment habitat and disturb soil almost as much as a clearcut.

After a clearcut, succession restarts from bare ground. Grasses and shrubs colonize first, fast-growing pioneer trees follow, and a mature forest canopy may take 60 years or more to return, connecting this topic to how land recovers and how sustainable forestry tries to shorten or soften that disruption.