The effect of fertilization on the below-ground diversity and community composition of ectomycorrhizal fungi associated with western hemlock (Tsuga heterophylla).

Mycorrhiza
Shannon H A WrightMary L Berbee

Abstract

Fertilization typically reduces ectomycorrhizal diversity shortly after its application but less is known about its longer-term influence on fungal species. Long-term effects are important in forests where fertilizer is rarely applied. We compared fungal species composition in western hemlock control plots with plots last fertilized 7 years ago with nitrogen (N) or nitrogen plus phosphorus (N + P). The N + P fertilization had a significant lingering effect, increasing the tree size and foliar P content of the western hemlocks. From ectomycorrhizal roots of 24-year-old trees from northern Vancouver Island, Canada, we identified fungi from 12 samples per treatment, by amplifying, cloning, and sequencing fungal ribosomal DNA fragments, placing sequences with 97% or more identity in the same operational taxonomic unit (OTU). Diversity was high across treatments; we detected 77 fungal OTUs, 52 from ectomycorrhizal genera, among 922 clone sequences. The five most frequent OTUs were similar in abundance across treatments. Only 19 OTUs matched any of the 197 previously reported ectomycorrhizal species of western hemlock. Species composition but not diversity in nitrogen plus phosphorus plots differed significantly from control or nitro...Continue Reading

References

Jun 12, 2004·Science·David A WardleDiana H Wall
Sep 10, 2005·Applied and Environmental Microbiology·Heath E O'BrienRytas Vilgalys

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Citations

Aug 13, 2011·Science·Anna RoslingTimothy Y James
May 12, 2010·The New Phytologist·Ian A DickieDuane A Peltzer
Jul 24, 2010·Journal of Microbiological Methods·Clement K M TsuiRichard C Hamelin

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