Category: Forestry & Silviculture

Knowing what the stand contains Forest inventory quantifies species composition, age structure, density, and merchantable volume. Inventory data drives harvest scheduling, regeneration planning, and carbon accounting. Sampling design Fixed-radius plots — count and measure trees within defined radius (e.g., 1/10 acre). Variable-radius (prism) sampling — basal area factor selects trees proportional to diameter. Strip or…

Competition and crown release Young stands often exceed optimal density. Trees compete for light, water, and nutrients — suppressed trees stagnate while dominants grow. Thinning reallocates growth to retained trees of desired species and form. Thinning types Pre-commercial thin — removes small trees before merchantable size; no revenue but improves future value. Commercial thin —…

Establishing a new cohort Planting success depends on site preparation, seedling quality, planting technique, and post-planting weed control. Failure in any step produces expensive re-planting or long-term brush competition. Site preparation Mechanical scarification — exposes mineral soil for root contact. Pile and burn — removes slash; watch erosion on slopes. Chemical site prep — controls…

From tree measurements to board feet Timber cruising estimates volume before harvest for sale negotiation and harvest planning. Volume equations translate DBH and height into cubic meters or board feet by product class. Cruising methods 100% tally on small sales — every tree measured. Sample cruise on large tracts — statistical confidence from plot frequency…

Fire as ecosystem process In many forest types, fire maintained structure and species composition for millennia. Suppression-only policies increased fuel loads and homogenized stands vulnerable to catastrophic crown fire. Fire regimes Surface fire — low intensity; maintains open understory in ponderosa pine. Mixed-severity — patchy mortality across landscape. Stand-replacing — high severity; resets cohort in…

Trees integrated with crops and livestock Agroforestry deliberately combines woody perennials with agricultural or pastoral production on the same land unit. Benefits include wind protection, diversified revenue, and carbon storage. System types Silvopasture — trees + forage + grazing animals. Alley cropping — tree rows with annual crops in alleys. Forest farming — cultivating shade-tolerant…