Action: Use shading for planted trees
- One replicated, controlled study in Panama found that shading increased the survival rate of planted native tree seedlings.
Shading newly planted trees can decrease evaporation or germination of competing species, and thus increase establishment chances of planted trees.
Supporting evidence from individual studies
A replicated, controlled study in 1996-1997 in degraded tropical forest in Panama (Hooper, Condit & Legendre 2002) found that shading increased the survival of planted native tree seedlings. The proportion of seedlings that survived out of those that germinated was higher in 75% shaded (74%) and 95% shaded plots (78%) than unshaded plots (39%). Data were collected in July 1997 in three treatment subplots (1×8 m): 95% shaded, 75% shaded and unshaded, in each of five plots, replicated in five sites. Each subplot was planted with 10 seeds of each of 20 native tree species in July 1996-March 1997. In all plots wild sugarcane Saccharum spontaneum was hand-cut three times during the experiment.