THE IMPORTANCE OF SHELTER TO EARLY TREE GROWTH ON UPLAND MOORS

A comparison of the effects of differing methods of cultivationcarried out on typical Calluna moor in the Cleveland (Yorkshire)massif has revealed that single-furrow deep forestry ploughing,by reason of its pronounced plough-ridges, has advantages overother more shallow and complete deep methods of ploughing ingiving shelter from cold off-shore winds which cause die-back.Orientation of the plough-ridges transverse to the wind directionand the use of leeward ridge slopes as planting positions enhancesthis shelter effect. The paper ends by drawing attention tothe need for forest meteorological reasearch upon the wind-treegrowth relationship.