Terrestrial Liming As a Restoration Technique for Acidified Forest Ecosystems

Figure 4

Mean number of all birds (abundance) and of ground-, understory-, and canopy-foraging birds (birds per point) with SE bars and model lines on lime-treated and control sites. Lime treatment was applied between 2003 and 2004 in central Pennsylvania. *Confidence intervals of the time-by-treatment interaction excluded zero, indicating a significant effect of liming on that variable.