Large Stock and Fertilizer Improve Growth of Douglas-Fir Planted on Unstable Granitic Soil in Northern California

摘要

Douglas-fir seedlings planted on granitic soil on the Klamath National Forest in northwestern California were studied to see if planting large stock or adding fertilizer would significantly improve survival or growth, or both. Use of large stock and fertilizer resulted in significant increases in height growth of seedlings, but not in better survival. Most mortality occurred during the growing season and was attributed to drought. The study was not intended to assess the reduction in erosion that might result from the plantings. Also, because research was restricted to one locality and one planting season, only limited inferences can be made as to applicability of the results.