Tree shelters improve the survival and growth of planted Engelmann spruce seedlings in southwestern Colorado
This study is summarised as evidence for the following.
Use tree guards or shelters to protect planted treesAction Link
Use tree guards or shelters to protect planted trees
A replicated, randomized, controlled study in 1996-1997 in temperate coniferous forest in Colorado, USA (Jacobs & Steinbeck 2001) found that tree shelters increased the survival rate of Engelmann spruce Picea engelmannii seedlings. The survival rate of Engelmann spruce was higher with the three light-coloured tree shelters (95-99%) than the controls (70%) and the lowest with the dark brown shelters (5%). Four replicates of each of five treatments were randomly assigned to 20 plots in each of three blocks (0.5 ha): four colours of recycled polyethylene plastic tree shelters (31 cm height and 9 cm diameter), ranging from nearly clear to brown, and a control (using materials from within the site, e.g. logs, stumps, shrubs, rocks, to protect seedlings). In August-September 1996, 25 seedlings were planted in each plot (total of 1,500 seedlings). Data were collected in 1997.