Some ecological factors affecting the formation ofCenococcummycorrhizae on basswood in southern Ontario

摘要

The effects of soil pH, ammonium nitrogen (NH4-N), nitrate nitrogen (NO3-N), and clay content on the formation ofCenococcum graniformemycorrhizae on basswood (Tilia americanaL.) were evaluated by assessing the degree of mycorrhizal infection of seedlings from natural forests in southern Ontario.Six hundred and thirty-nine basswood seedlings were collected, with adhering soil, from 22 woodlots between 43deg;30prime; N. and 44deg;36prime; N. The soils were mainly sandy and clay loams and the pH ranged from 6.2 to 8.4.The development ofCenococcummycorrhiza was found to decrease as the pH, clay content, or NO3-N of the soil increased. Concentration of NH4-N was not found to be correlated with mycorrhizal infection. For a subsample of alkaline soils ranging in pH from 7.1 to 8.4, no correlation was evident between NO3-N and mycorrhizal infection.