Foliar Litter Decomposition: A Conceptual Model with Focus on Pine (Pinus) Litter—A Genus with Global Distribution
Figure 12
Hydrolytic enzyme activity (β-glucosidase and cellobiohydrolase) in white pine and pin oak foliar litter harvested during the first three years of a decomposition experiment. Values are given by treatment as averaged over sites and substrates. An asterisk indicates that a particular treatment differed significantly from the control treatment at a particular harvest time. Values are means with standard error bars. Overall model R 2 values from 3-way analysis of variance (ANOVA) including treatment, site, and substrate as main effects were done separately for each harvest date and ranged from 0.25 to 0.58 for β-glucosidase, 0.24 to 0.69 for cellobiohydrolase. Control, carbon addition (25.5 g C m−2 y−1 as glucose), addition of inorganic N (10 g N m−2 y−1 as NH4NO3), addition of carbon (25.5 g C m−2 y−1 as glucose) and inorganic N (10 N m−2 y−1 as NH4NO3), long-term N additions (10 g N m−2 y−1 as NH4NO3 since 1999), (6) addition of non-N nutrients (P, K, Ca, Mg, S, Fe), (7) addition of organic N (10 g N m−2 y−1 as amino acids). From [77].
