Abstract:

Pinus massoniana was grown in a nurse bed consisting of a strong acidic yellow soil and inoculated with 3 strains of Laccaria bicolor, namely Lb S238A, Lb S238N and Lb 270, respectively. The growth of seedlings, particularly stems and leaves, was promoted significantly by the ectomycorrhizal(ECM) fungi in the sequence: Lb270 > Lb S238N > LbS238A. In contrast, the inhibition of aluminum translocation was observed from roots to upper parts compared to the absorption and utilization of N, P, Ca and Mg that were encouraged by ECM. Seedlings infested with Lb S238A absorbed least amount of nutrients and aluminum, while the largest amount of P, K and Mg was taken in by those with Lb 270 and the largest amount of N and Ca by those with Lb S238N。It is necessary to point out that Ca absorption and accumulation in the upper parts of pine seedling were greatly promoted by ECM inoculation. The latter in those of mycorrhizal seedlings was increased by 473%～577% over than nonmycorrhizal(NM) ones, which could benefit to the aluminum resistance of the tree seedlings. The inoculation of Laccaria bicolor could, therefore, be considered as an important and effective measurement to promote growth and nutrition and to alleviate aluminum toxicity to Pinus massoniana in south China.

Key words: Pinus massoniana, Laccaria bicolor, nutrient, aluminum