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Tree Species and Soil Textural Controls on Carbon and Nitrogen Mineralization Rates

^a Dep. Natural Resources and Environmental Management, Univ. of Hawaii-Manoa, 1910 East-West Rd., Honolulu, HI 96822
^b USDA-Forest Service, Rocky Mountain Research Station, 240 West Prospect St., Ft. Collins, CO 80526, and Graduate Degree Program in Ecology and Dep. Forest Science, Colorado State Univ., Ft. Collins, CO 80526
^c USDA-Forest Service, Rocky Mountain Research Station, 240 West Prospect St., Ft. Collins, CO 80526, and Graduate Degree Program in ecology, Colorado State Univ., Ft. Collins, CO 80526
^d Graduate Degree Program in Ecology and Dep. Forest Science, Colorado State Univ., Ft. Collins, CO 80523

View larger version (21K): [in a new window]   Fig. 1. Means with standard errors for soil C mineralization rates (g C kg-1 soil C 31 d-1), which is total soil C release normalized for initial differences in soil C content and adjusted each month for losses of soil C in previous months (n = 6).

View larger version (21K): [in a new window]   Fig. 2. Means with standard errors for cumulative C release (g C kg-1 soil C) from pine and aspen soils (n = 6). (A) shows cumulative soil C release during the first 152 d of incubation. (B) shows cumulative soil C release during the last 130 d of incubation.

View larger version (29K): [in a new window]   Fig. 3. (A) Relationship between total C release (g C kg-1 soil C) over 16 mo and soil clay content (g kg-1 soil) for pine and aspen soils (n = 6); (B) Relationship between soil C content (g C kg-1 soil) and soil clay content (g kg-1 soil) for pine and aspen soils (n = 6). Regression equations are from linear regression analyses.

View larger version (24K): [in a new window]   Fig. 4. (A) Means with standard errors for 16 mo cumulative release of NH+4 (g N kg-1 soil N) from mineral soil sampled from pine and aspen stands during the four leaching events (n = 6); (B) Cumulative release of NO-3 (g N kg-1 soil N); (C) Cumulative release of total mineral N (g N kg-1 soil N).

View larger version (23K): [in a new window]   Fig. 5. Means with standard errors for total quantities of active bacterial, total bacterial, active fungal, and total fungal biomass (mg kg-1 soil C) in pine and aspen soils (n = 6). Total fungal biomass was divided by 100 to fit the data on the graph.

View larger version (22K): [in a new window]   Fig. 6. Relationships between the ratio of active fungi/active bacteria (kg kg-1) and soil clay content (g kg-1 soil) for pine and aspen soils (n = 6), across gradients of soil clay content. Regression equations are from linear regression analyses.