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Biosolids-Derived Nitrogen Mineralization and Transformation in Forest Soils

Forest Research, Sala Street, Private Bag 3020, Rotorua, New Zealand

View larger version (14K): [in a new window]   Fig. 1. Effect of biosolids type on mineralization of organic N in soils amended with biosolids during 26 weeks of incubation (the means across two soils and two temperatures, % of initial organic N). Error bars are 95% confidence intervals. AnM, anaerobically digested municipal biosolids; AeM, aerobically digested municipal biosolids; PP1 and PP2, two pulp and paper industrial biosolids from two aerated wastewater stabilization lagoons.

View larger version (11K): [in a new window]   Fig. 2. Effect of temperature on mineralization of organic N in soils amended with biosolids (the means across two soils and four biosolids, % of initial organic N). Error bars are 95% confidence intervals.

View larger version (28K): [in a new window]   Fig. 3. The influence of soil on mineralization of different types of biosolids (the means across both 10 and 20°C, % of initial organic N). Error bars are 95% confidence intervals. AnM, anaerobically digested municipal biosolids; AeM, aerobically digested municipal biosolids; PP1 and PP2, two pulp and paper industrial biosolids from two aerated wastewater stabilization lagoons.

View larger version (28K): [in a new window]   Fig. 4. Proportion of NO3 as percentage of total mineralized N in leachate after each incubation period at (A) 10 and (B) 20°C. AnM, anaerobically digested municipal biosolids; AeM, aerobically digested municipal biosolids; PP1 and PP2, two pulp and paper industrial biosolids from two aerated wastewater stabilization lagoons.