Sep 17, 2009

Long-term phosphorus fertilization impacts soil fungal and bacterial diversity but not AM fungal community in alfalfa

Microbial Ecology
M S BeauregardM St-Arnaud

Abstract

Soil function may be affected by cropping practices impacting the soil microbial community. The effect of different phosphorus (P) fertilization rates (0, 20, or 40 kg P(2)O(5) ha(-1)) on soil microbial diversity was studied in 8-year-old alfalfa monocultures. The hypothesis that P fertilization modifies soil microbial community was tested using denaturing gradient gel electrophoresis and phospholipids fatty acid (PLFA) profiling to describe soil bacteria, fungi, and arbuscular mycorrhizal (AM) fungi diversity. Soil parameters related to fertility (soil phosphate flux, soluble P, moisture, phosphatase and dehydrogenase assays, and carbon and nitrogen content of the light fraction of soil organic matter) were also monitored and related to soil microbial ribotype profiles. Change in soil P fertility with the application of fertilizer had no effect on crop yield in 8 years, but on the year of this study was associated with shifts in the composition of fungal and bacterial communities without affecting their richness, as evidenced by the absence of effect on the average number of ribotypes detected. However, variation in soil P level created by a history of differential fertilization did not significantly influence AM fungi ribotyp...Continue Reading

Mentioned in this Paper

Fertility
Microorganism
Fertilizers
Phosphoric Monoester Hydrolases
Infertility Study
Avian Crop
Seasonal Variation
Phosphate Measurement
LUC7L3 gene
Red Phosphorus

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