Record ID No. |
2113 |
Author(s) |
Hrynkiewicz K., Baum C., Leinweber P. , 2009 |
Affiliation |
Nicholas Copernicus Univ, Dept Microbiol, Inst Gen & Mol Biol, Gagarina 9, PL-87100 Torun, POLAND |
Title |
Mycorrhizal community structure, microbial biomass P and phosphatase activities under Salix polaris as influenced by nutrient availability |
Source. Vol.(no):Page |
European Journal of Soil Biology. 45(2): 168-175p. |
Categories |
Ectomycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Country |
Poland, Europe |
Abstracts |
Low supply of the nutrients nitrogen (N) and phosphorus (P) limit plant growth and spreading, and increase the plant-microbial nutrient competition in subarctic and arctic regions. We investigated the mycorrhizal community structure of a polar shrub willow (Salix polaris) and the microbial turnover in its rhizosphere to explore the adaptation of a mycorrhizal plant in the subarctic tundra. The ectomycorrhizal colonisation ranged from 35 to 64% of the fine root tips and decreased with an increasing soil C/N ratio. In total, 16 ectomycorrhizal morphotypes were found under S. Polaris (eight to 13 morphotypes per site, five morphotypes at all four sites). Cenococcum sp. Was the most common EM fungus (32% of the ectomycorrhizal fine roots). The abundance of Cenococcum sp. Increased with an increasing organic matter content and N/P ratio in the soil. Arbuscular mycorrhizal colonisation of S. Polaris was absent or less than 1% of the fine root length. Microbial biomass P accounted for 21-75% of the organic soil P and 6-49% of the total soil P. Microbial biomass P, alkaline and acid phosphatase activities in the rhizosphere increased with increasing soil N concentration. We conclude that a higher N supply decreases the diversity in the mycorrhizal community on polar willows and increases the role of P turnover from the soil microbial biomass for the nutrient supply. (C) 2008 Elsevier Masson SAS. |