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Response of 70-year-old white spruce to thinning and fertilization in interior Alaska



Response of 70-year-old white spruce to thinning and fertilization in interior Alaska



Canadian Journal of Forest Research 6(2): 145-152



Applications of 112 kg ha-1 N as NH4NO3, 56 kg ha-1 P treble superphosphate, and 112 kg ha-1 K as KCl in combination with thinning of 61% of initial basal area increased diameter increment 3.6 times over the control within 1 summer. Fertilizer was applied annually at these rates for 5 yr to maintain high levels of tree nutrition and accurately assess growth response. After 5 yr, growth increment continued. Thinning alone resulted in significant increases in soil moisture content and moderate increases in soil temperature. Changes in soil temperature and moisture regime did not appear to affect tree nutrition. For 70 yr old white spruce (Picea glauca (Moench) Voss) growing on upland sites, a combination of both thinning and fertilization appears necessary to obtain maximum growth response.

Accession: 000485400

Download citation: RISBibTeXText

DOI: 10.1139/x76-018



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