Variation in Total and Soluble Nitrogen Concentrations in Response to Fertilization of Douglas-Fir
Concentrations of total N (N percent), ninhydrin positive compounds, monosubstituted guanidino compounds, arginine, and proline were determined in current and 1-year-old foliage and twigs of 15-year-old Douglas-fir trees over a 1-year period. N percent and soluble N compound concentrations were high in current shoots after flushing in May and decreased rapidly until August. Soluble N compound concentrations increased more as a result of N fertilization than did N percent. This was also true for phloem (inner bark) samples and root samples. Comparison of total and soluble N analyses of current needles, phloem, and roots, sampled from N fertilizer experiments on four sites, showed phloem analyses were better correlated with needle analyses than were root analyses. Greatest linear correlations occurred between phloem and root analyses. Data from six sites showed growth, and relative growth rate, of Douglas-fir was correlated with initial stand measurements (R² = 0.24 to 0.77) and inclusion of root soluble N compounds in the multiple regressions increased the correlation (R² = 0.41 to 0.85). Root and bark concentrations of arginine and guanidino compounds were most useful in explaining variation in stand growth after fertilizing. Forest Sci. 23:134-142.
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Document Type: Journal Article
Affiliations: Tree Physiologist, Research Division, B.C. Forest Service, Parliament Buildings, Victoria, B.C. V8V 1X5, Canada
Publication date: 1977-06-01
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