Spacing affects stem form, early growth and branching in young whitewood ('Endospermum medullosum') plantations in Vanuatu

Abstract

This paper investigates the early growth response, branching and stem quality of 'Endospermum medullosum' (whitewood) at different spacings. Whitewood plantings were established at stockings of 400-833 trees per hectare and early growth, tree stem quality and branching were quantified up to age 3 years. Growth, number of live branches and branch size were negatively correlated with stocking. The stocking of trees of acceptable quality had high spatial variation. Initial spacing in whitewood plantations can be used to manipulate branch size, crown rise and stem size; all of which are important for development of pruning and thinning regimes to produce high quality logs. If unimproved whitewood stock is used, to ensure that there are 300 stems per hectare of acceptable quality to produce sawlogs, more than 600 trees per hectare should be established at planting.