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Litter Quality and Climate Decouple Nitrogen Mineralization and Productivity in Chilean Temperate Rainforests

Dep. of Earth and Environmental Science, The Univ. of Pennsylvania. 240 S. 33rd St., Philadelphia, PA 19104

View larger version (22K): [in a new window]   Fig. 1. Annual pattern in litterfall: (A) quantity and (B) lignin/N ratio over a 1-yr period in three forests of Isla de Chiloé, Chile. Standard error bars are shown (n = 6 plots).

View larger version (22K): [in a new window]   Fig. 2. Change in soil inorganic N (NO3 and NH4) concentrations over the growing season in three forests on Isla de Chiloé, Chile, as measured by the in situ resin core method of estimating N mineralization. "Pre-incubation" values represent inorganic N in the soil just before installing incubations; "post-incubation" values represent the amount of inorganic N accumulated and leached from the incubation after approximately 4 wk. Standard error bars are shown. The difference between pre- and post-incubation concentrations represents the amount of N mineralized (positive difference) or immobilized (negative difference) during that period.

View larger version (24K): [in a new window]   Fig. 3. (A) Comparison of aboveground net primary production (ANPP) on an annual basis with growing season degree days (GSDD). Line is a linear regression, R2 = 0.874, p < 0.001. (B) Regression of residuals from ANPP/GSDD relationship with net N mineralization (R2 = 0.010, p > 0.1) and (C) soil moisture (R2 = 0.010, p > 0.1).

View larger version (20K): [in a new window]   Fig. 4. The relationship between net N mineralization and litter lignin/N ratio in broadleaf and needleleaf forests in the Cordillera de Piuchué and cool temperate (summer month high temperature < 20°C) North American sites from Scott and Binkley (1997) (R2 = 0.55).

View larger version (13K): [in a new window]   Fig. 5. Relation between ANPP and N mineralization rate for three forests in southern Chile (black squares) and various North American forests. Open squares: Reich et al. (1997), Table 3. Closed circles: Joshi et al. (2003). Open circles: Van Cleve et al. (1983). Triangles: Pastor et al. (1984).