The data of ecology reveals a very close relationship between soil types and the species of plant which will be normally found on them. Silviculturists have lately applied methods of ecology quite intensively to a study of the habits and associations of trees, and in these studies the physical and chemical properties of soils occupy a position of prominence. Silviculturists recognize some ten or twelve ecological factors influencing the occurrence and distribution of sylva. These are quite commonly known to foresters as the "Silvicultural Characteristics of Trees." Among the most important of these factors is the one of soil quality.
Proceedings of the Iowa Academy of Science
©1925 Iowa Academy of Science, Inc.
Trenk, Fred B.
"The Occurrence of Hickories in Iowa in Relation to Soil Types,"
Proceedings of the Iowa Academy of Science, 32(1), 143-155.
Available at: https://scholarworks.uni.edu/pias/vol32/iss1/23