Abstract
The relation between plant root and mycorrhiza and the soil environment were reviewed. The existence of root and mycorrhiza in soil promoted the aggregation of soil and increased available nutrition. As a result, it improved soil productivity and prevented soil erosion. The colonization of mycorrhizal fungi and sporulation was affected by soil moisture and soil structure. For the germination of spore, the oxygen was necessary. On the other hand, carbon dioxide promoted the spore germination of mycorrhizal fungi.
