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Afforestation Alters Prairie Soil Nitrogen Status¹

ABSTRACT

Two prairie soils were examined after 20-years of occupancy by four tree species to determine what alterations had occurred. Bulk density, exchangeable bases, pH, and organic carbon had not changed in the 0 to 10-cm soil layer. Red pine (Pinus resinosa) and Japanese larch (Larix leptolepis) caused significant increases in total N and a change in N form. Tulip tree (Liriodendron tulipifera) caused a significant change in N form while basswood (Tilia americana) caused no significant alteration. From this we conclude that alteration in soil N form is one of the first changes to occur following afforestation.

¹ Research supported by the Illinois Agr. Exp. Sta. Presented before Div. S-7, Soil Science Society of America, Miami, Florida, 30 Oct. 1972.

² Associate Professor, Faculty of Forestry, Univ. of Toronto, Toronto, M5S 1A1, Canada and Research Assistant, Dep. of Agricultural Engineering, Univ. of Delaware, Newark, respectively.

Received for publication July 13, 1973. Accepted for publication November 7, 1973.