Fig. 3From: Designing near-natural planting patterns for plantation forests in ChinaAll possible planting patterns for a structural unit of nine trees: a reference tree in the center that is surrounded by 8 neighbors. With four neighbors, there are 13 different patterns: five even or very even units (Wi < 0.5), seven random units (Wi = 0.5) and one irregular or very irregular unit (Wi > 0.5)Back to article page