MSA - Ecology/Pathology
Rosenstock, Nicholas P. , Bruns , Thomas , Rosling, Anna .
Linking small scale soil chemical variability to fungal niche preference.
Soil heterogeneity is often proposed to be a factor driving the diversity of ectomycorrhizal fungi in a given stand. Significant evidence exists to suggest that, at least on the scale of horizon-to-horizon variation, consistent shifts in fungal (including just mycorrhizal) community can be found to correlate with soil chemical variables. However, significant diversity is still found in a given soil horizon, suggesting that if soil chemical factors and niche heterogeneity are driving fungal diversity then a smaller scale of sampling is necessary. We looked at a large number (150) of small (<5g) soil samples taken from a bishop pine forest at Point Reyes National Seashore in northern California. A 70 cm vertical transect was drawn across a soil profile and 10 samples were taken per vertical transect. Each pit had three vertical transects X 3 pits X 2 sites (one on granitic, one on sandstone parent material). Climate, stand age, and stand history were all constant between pits. For each sample %C, %N, pH, and BaCl2 exchangeable Na, Ca, K, and Mg were measured. Also for each sample the fungal community was characterized using terminal restriction fragment length polymorphism in conjunction with cloning and sequencing. The most significant factor shaping fungal communities was parent material, followed by (in descending order of influence) exchangeable Ca, exchangeable Mg, and pH. While there was a significant amount of co-correlation between these factors, both exchangeable Ca and Mg are still significantly correlated with fungal community when the effect of parent material is removed. The overall variability of soil chemical variables is discussed as is individual fungal species habitat preferences. To our knowledge, this is the first study which links soil chemical variability in the field to fungal species presence on a scale relevant to individual hyphae.
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1 - University of California, Berkeley, Environmental Science, Policy, and Management, 321 Koshland Hall, Berkeley, CA, 94720-3102, USA
2 - University of California Berkeley, Plant and Microbial Biology, 321 Koshland Hall, Berkeley, CA, 94720-3102, USA
3 - Swedish University of Agricultural Sciences, Forest Mycology and Pathology, Ulls vag 26a, Uppsala, 750 07, Sweden
Presentation Type: Oral Paper:Papers for Topics
Location: Cottonwood B/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 9:00 AM