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Reforestation and Topography Affect Montane Soil Properties, Nitrogen Pools, and Nitrogen Transformations in Hawaii

^a Inst. of Pacific Islands Forestry, Pacific Southwest Res. Station, USDA Forest Service, 1151 Punchbowl St., Suite 323, Honolulu, HI 96813
^b Dep. of Tropical Plant and Soil Sciences, Univ. of Hawaii at Manoa, 1910 East-West Road, Honolulu, HI 96822

View larger version (42K): [in a new window]   Fig. 1. Effects of vegetation type and topographic position on average (+1 SE) gross rates of production and immobilization of NH4+–N and NO3––N in surface soils (0–15 cm). Differences among means were significant only for NO3––N production; bars capped by a common lowercase letter were not significantly different (Tukey HSD test, set at 0.05).

View larger version (39K): [in a new window]   Fig. 2. Rates (area basis, +1 SE) of gross production and immobilization of NH4+–N and NO3––N as measured in spring (April) and fall (October) 1999 by the 15N pool dilution method in disturbed surface soils (0–15 cm), by vegetation type and topographic position. Data for April are based on one sample per combination of vegetation and topographic position, hence no error bars are shown. Fill patterns denoting vegetation type are the same as shown in Fig. 1.