Mineralization of phosphorus from microbial biomass in soil
1989
Kondo, H. (National Grassland Research Inst., Nishinasuno, Tochigi (Japan)) | Koyama, N. | Tsuiki, M. | shiyomi, M. | Katoh, K. | Kurashima, K.
The phosphorus contents of living aboveground parts, standing-dead materials plus surface litter and underground parts in several pasture species in the Fujinita experimental pasture were determined during a period of 6 months. The contents of phosphorus in the soil microbial biomass, soil NaHCO3 extractable P (OLSEN-P) fraction, and soil NH4F-HCl extractable P (BRAY-P) fraction were also measured to evaluate the effect of the soil microbial biomass in a grazing pasture ecosystem. The amount of soil phosphorus transferred to the OLSEN-P fraction was 11kg/ha/155 days. The calculated amount of the OLSEN-P fraction through the soil biomass was 4.3kg/ha/155 days. About 39% of the phosphorus transferred to the OLSEN-P fraction originated from the soil biomass. These results suggest that biomass P could make a significant contribution to plant P nutrition in grasslands
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