wooden chips used as organic mulch in gardening, landscaping, restoration ecology, bioreactors for denitrification

abstract background bark bioreactors brown carpentry chip chips chopped closeup construction craft cultivation cut denitrification dry ecological ecology energy environment forest garden gardening industry landscaping lumber manufacturing material mulch mushroom natural nature organic outdoors pattern pieces raw restoration rough sawdust shaving shredded substrate surface texture textured timber tree used waste wood wooden work workshop