Difference between spring wood ,autumn wood , heart wood and sap wood??

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Heart wood	Sapwood
Represent the old elements of secondary xylem	Represent the young elements of secondary xylem
Present in central region	Present in peripheral region
Dark in colour	Light in colour
Physiologically inactive	Physiologically active

 
In spring season, cambium is very active and produces a large number of xylary elements with wider vessels. This wood is called spring wood or early wood. It is lighter and has lower density.

In winters, xylem is less active and forms fewer xylary elements with narrow vessels. This wood is called autumn wood or late wood. It is darker and has higher density.

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