Figure 1. G rowth rate (a), and C biomass (b) of algae incubated in the leaf litter leachates of 11 tree species. White boxes are incubations without micronutrient amendment (control treatment) and gray boxes are incubation with micronutrient amendment (amended treatment). Boxes are arranged according to the P content in leaf litter biomass from low to high within broadleaf and coniferous tree groups as in Table 1. Asterisks indicate that there is a significant difference between control and amended treatments (p < 0.05). Different letters indicate a significant difference among control treatments of different leaf litter leachates.