Increasing abundance of soil fungi is a driver for N-15 enrichment in soil profiles along a chronosequence undergoing isostatic rebound in northern Sweden. Wallander, H., Morth, C., & Giesler, R. Oecologia, 160(1):87–96, May, 2009. doi abstract bibtex Soil organic material (SOM) is usually enriched in N-15 in deeper soil layers. This has been explained by discrimination against the heavier isotope during decomposition or by the accumulation of N-15-enriched microbial biomass versus plant biomass in older SOM. In particular, ectomycorrhizal (EM) fungi have been suggested to accumulate in old SOM since this group is among the most N-15-enriched components of the microbial community. In the present study we investigated the microbial community in soil samples along a chronosequence (7,800 years) of sites undergoing isostatic rebound in northern Sweden. The composition of the microbial community was analyzed and related to the delta N-15 and delta C-13 isotope values of the SOM in soil profiles. A significant change in the composition of the microbial community was found during the first 2,000 years, and this was positively related to an increase in the delta N-15 values of the E and B horizons in the mineral soil. The proportion of fungal phospholipid fatty acids increased with time in the chronosequence and was positively related to the N-15 enrichment of the SOM. The increase in delta C-13 in the SOM was much less than the increase in delta N-15, and delta C-13 values in the mineral soil were only weakly related to soil age. The C:N ratio and the pH of the soil were important factors determining the composition of the microbial community. We suggest that the N being transported from the soil to aboveground tissue by EM fungi is a driver for N-15 enrichment of soil profiles.
@article{wallander_increasing_2009,
title = {Increasing abundance of soil fungi is a driver for {N}-15 enrichment in soil profiles along a chronosequence undergoing isostatic rebound in northern {Sweden}},
volume = {160},
issn = {0029-8549},
doi = {10.1007/s00442-008-1270-0},
abstract = {Soil organic material (SOM) is usually enriched in N-15 in deeper soil layers. This has been explained by discrimination against the heavier isotope during decomposition or by the accumulation of N-15-enriched microbial biomass versus plant biomass in older SOM. In particular, ectomycorrhizal (EM) fungi have been suggested to accumulate in old SOM since this group is among the most N-15-enriched components of the microbial community. In the present study we investigated the microbial community in soil samples along a chronosequence (7,800 years) of sites undergoing isostatic rebound in northern Sweden. The composition of the microbial community was analyzed and related to the delta N-15 and delta C-13 isotope values of the SOM in soil profiles. A significant change in the composition of the microbial community was found during the first 2,000 years, and this was positively related to an increase in the delta N-15 values of the E and B horizons in the mineral soil. The proportion of fungal phospholipid fatty acids increased with time in the chronosequence and was positively related to the N-15 enrichment of the SOM. The increase in delta C-13 in the SOM was much less than the increase in delta N-15, and delta C-13 values in the mineral soil were only weakly related to soil age. The C:N ratio and the pH of the soil were important factors determining the composition of the microbial community. We suggest that the N being transported from the soil to aboveground tissue by EM fungi is a driver for N-15 enrichment of soil profiles.},
language = {English},
number = {1},
journal = {Oecologia},
author = {Wallander, Hakan and Morth, Carl-Magnus and Giesler, Reiner},
month = may,
year = {2009},
keywords = {\#nosource, Chronosequence, Ectomycorrhizal fungi, Microbial community, Soil profile, ectomycorrhizal fungi, external mycelium, isotope fractionation, microbial communities, mycelia production, mycorrhizal fungi, natural-abundance, nitrogen deposition, organic-matter, plfa, primary succession},
pages = {87--96},
}
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In the present study we investigated the microbial community in soil samples along a chronosequence (7,800 years) of sites undergoing isostatic rebound in northern Sweden. The composition of the microbial community was analyzed and related to the delta N-15 and delta C-13 isotope values of the SOM in soil profiles. A significant change in the composition of the microbial community was found during the first 2,000 years, and this was positively related to an increase in the delta N-15 values of the E and B horizons in the mineral soil. The proportion of fungal phospholipid fatty acids increased with time in the chronosequence and was positively related to the N-15 enrichment of the SOM. The increase in delta C-13 in the SOM was much less than the increase in delta N-15, and delta C-13 values in the mineral soil were only weakly related to soil age. The C:N ratio and the pH of the soil were important factors determining the composition of the microbial community. 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