Figure
3. C (a), N (b), and P (c) cell quotas of algae incubated in culture
media prepared from leaf litter leachates of 11 tree species. White
boxes are control incubations and gray boxes are amended incubations.
Boxes are arranged according to the P mass content in leaf litter from
low to high within broadleaf and coniferous groups as in Table 1.
Asterisks indicate that there is a significant difference between
control and amended incubations (p < 0.05). Different
letters indicate a significant difference between control treatments of
different leaf litter leachates.