Tree GrowthDendrology - study of treesDendrochronology - study of tree rings

Tree Cross Section

Outer Bark: Protection, insulation

Inner Bark: phloem, carries food short lived - becomes bark/corkCambium Layer : cell division, annual ring addedSapwood: new wood, carries water (xylem)

Heartwood: strength, support

Spring CellsSummer CellsThis tree is 50 years old!

Diameter TapeMeasured at DBH - 4.5)

Increment BorerCore sample

Twig Diagramprimary growth - growth upwardsecondary growth - outward growth

Terms To KnowBarkPrimary GrowthGravitropismHeartwood Secondary GrowthAuxinsSapwood Bundle Scar/Leaf ScarCytokininsCambium Increment Borer Annual RingPith Diameter TapeXylemDBHPhloemDendrologyTerminal BudDendrochronologyLateral BudPruningLenticelGraftingBud Scale ScarPhototropism