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Accumulation of Microbial Biomass within Particulate Organic Matter of Aging Golf Greens

Dep. of Agron. and Hortic., 279 Plant Science, Univ. of Nebraska, Lincoln, NE 68583-0915

View larger version (12K): [in a new window]   Fig. 1. Soil fractionation sequence for determining the location of microbial biomass (MB). NMT, sodium metatungstate; POM, particulate organic matter; MF, mineral fraction; H-POM, heavy POM; and L-POM, light POM.

View larger version (31K): [in a new window]   Fig. 2. Microbial biomass (MB) measured as extractable lipid phosphate (lipid-P) on (A) field-moist soils sampled in 1996 and (B) air-dried soils sampled in 1997 and 1999. Microbial biomass on air-dried soils includes those of whole soil (as the sum of MB in POM and MF), particulate organic matter (POM), and mineral fraction (MF). Each data point is a single observation. ***Both model and slope are significant at P = 0.001.

View larger version (17K): [in a new window]   Fig. 3. Microbial biomass (MB) accounted for by particulate organic matter (POM) of air-dried soils from greens sampled in 1997 and 1999. Each data point is a single observation. ***Both model and slope are significant at P = 0.001.

View larger version (25K): [in a new window]   Fig. 4. Relationship to green age of (A) microbial biomass (MB) per unit mass of particulate organic matter (POM) and mineral fraction (MF) and (B) soil mass composed of POM. Soils are air-dried and from greens sampled in 1997 and 1999. Each data point is a single observation. *, **, and ***, both model and slope are significant at P = 0.05, 0.01, and 0.001, respectively.

View larger version (21K): [in a new window]   Fig. 5. Microbial biomass (MB) accounted for by heavy particulate organic matter (H-POM) and light POM (L-POM) of air-dried soils from greens sampled in 1997 and 1999. Each data point is a single observation. * and ***, both model and slope are significant at P = 0.05 and 0.001, respectively.

View larger version (18K): [in a new window]   Fig. 6. Total C comprised of C in humic acid (HA-C) and fulvic acid (FA-C) fractions of air-dried soils from greens sampled in 1997 and 1999. Each data point is a single observation. POM, particulate organic matter; MF, mineral fraction. ***Both model and slope are significant at P = 0.001.

View larger version (15K): [in a new window]   Fig. 7. Relationship of the amount of microbial biomass (MB) in particulate organic matter (POM) relative to mineral fraction (MF) to the amount of humic substances in POM relative to MF. Soils are air-dried and from greens sampled in 1997 and 1999. HA-C, humic acid carbon; FA-C, fulvic acid carbon. ***Both model and slope are significant at P = 0.001.