Geographic Variation in Forest Trees is the first book to examine this subject from a world-wide perspective. The author discusses population genetic theory and genetic systems of native North American tree species as they interact with environments in the major climatic regions in the world. He then demonstrates how this knowledge is used to guide seed zoning and seed transfer in silviculture, basing much of his discussion on models developed in Scandinavia and North America. In the final chapter, the author addresses the issue of genetic conservation -- a subject of great concern in the face of accelerated forest destruction, industrial pollution, and climatic change. This comprehensive, well-researched book makes a significant contribution to the knowledge of one of our most important renewable natural resources.

The mean specific gravity values of longleaf, slash, loblolly, shortleaf, Virginia, sand, and white pines growing on some of the National Forests, in Region 8 are presented by National Forest and by State. ranges in specific gravity as well as the standard deviations are also presented. variation in mean specific gravity with geographic location is discussed for the four major southern pine species. the mean specific gravity values of longleaf, loblolly, and slash pine increased from North to South along the Atlantic Coast and from West to East along the Gulf Coast. the shortleaf pine sample showed no apparent geographic trends.

The Southern Forest: Geography, Ecology, and Silviculture examines the forests of the South, providing a comprehensive description of the region from which most of the nation's wood for housing and paper will be grown and harvested in the future. It gives special attention the four factors of site - edaphic, biotic, climatic, and physiographic. It also includes over 200 photographs, an extensive listing of literature citations, and appendixes of tree, insect, and disease agents. With files of field notes and photographs, it takes the reader along to grasp the South's rich forests. Land managers will need no other reference to the soils, biotic components, climate or physiology of the region.