Trees for the Aleutians

Abstract

Climatic factors derived from incomplete but generally adequate prewar on temps., precipitation, and cloudiness, along with some wartime totals, show conditions not less favorable for tree growth than those in adjacent Alaska where dense forest stands occur. Wind velocities also are not more severe in the Aleutians than in certain forested areas. Soil tests show no conditions sufficient to be limiting factors. Analysis of tree growth in adjacent Kodiak Island shows an advancing forest margin. Establishment of new foci of tree propagation by natural means in the Aleutians is difficult because of lack of favorable conditions, especially the lack of necessary recurrence of seed invasion pending development of self seeding. Because of prevailing winds such seeding would necessarily be from Asia. Many tree planting efforts since 1920 are discussed with indications that plantings may become established if given adequate care. Sitka spruce from adjacent Alaska is most promising, but white and black spruce, mountain hemlock, northern black cottonwood, balsam poplar, white and Kenai birch, aspen, alder, and willow have been planted.