Nutrient concentrations and nitrogen mineralization in forest floors of single species conifer plantations in coastal British Columbia

被引:61
作者
Prescott, CE
Vesterdal, L
Pratt, J
Venner, KH
de Montigny, LM
Trofymow, JA
机构
[1] Univ British Columbia, Dept Forest Sci, Vancouver, BC V6T 1Z4, Canada
[2] Danish Forest & Landscape Res Inst, Dept Forest Ecol, DK-2970 Horsholm, Denmark
[3] BC Minist Forests, Res Branch, Victoria, BC V8W 9C2, Canada
[4] Forestry Canada, Pacific Forestry Ctr, Canadian Forest Serv, Victoria, BC V8Z 1M5, Canada
关键词
D O I
10.1139/cjfr-30-9-1341
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
We examined the extent to which nutrient concentrations and C and N mineralization rates in forests floors under different tree species are predictable from the chemistry of foliar litter and its rate of decomposition. We studied replicated single species plantations of western redcedar (Thuja plicata Donn ex D. Don), western hemlock (Tsuga heterophylla (Raf.) Sarg.), Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), and Sitka spruce (Picea sitchensis (Bong.) Carr.) at four locations. Nutrient concentrations in forest floors correlated poorly with litter nutrient concentrations; the only significant relationships were for Ca and K. Nitrogen mineralization correlated weakly with forest floor C/N ratio, and differed more among sites than among species. None of the litter chemistry parameters were related to net N mineralization rates. Decomposition was fastest in hemlock litter, intermediate in Douglas-fir litter and lowest in cedar litter. Litter also decomposed more rapidly on hemlock forest floors than on cedar forest floors. Rates of N mineralization in the forest floors were not related to rates of decomposition of foliar litter. Differences among sites in N mineralization rates were related to the understory vegetation composition, particularly the amount of the ericaceous shrub salal, which in turn was related to slope position. These site factors appeared to override the effect of tree species on rates of N mineralization.
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页码:1341 / 1352
页数:12
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