EurekaMag.com logo
+ Translate

Effect of forest floor on growth and nutrition of Douglas-fir and western hemlock seedlings with and without fertilizer


, : Effect of forest floor on growth and nutrition of Douglas-fir and western hemlock seedlings with and without fertilizer. Canadian Journal of Forest Research 22(9): 1222-1229

Experiments were conducted to determine the effects of four different forest soils on growth and shoot nutrients of potted Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) seedlings, in absence and in presence of forest floor, and with and without N and P fertilizers. Nine-month-old seedlings from low-elevation seed sources were used, and seedlings were grown for 2 years in a roofed lathhouse. Soils were of the Klone, Vesta, Bunker, and Shelton series; Klone and Vesta soils, and Bunker and Shelton soils, were collected from western hemlock and Douglas-fir stands, respectively. The fertilizers ammonium nitrate at 100 kg N/ha and triple superphosphate at 226 kg P/ha were tested. The forest floor, at 70 g/7.6-L pot, and the N and P fertilizers were added to the top of the planting pots without mixing. The forest floors and mineral soils differed by source in many of the chemical characteristics determined. Overall, seedling growth of Douglas-fir and western hemlock was better in the Klone and Shelton soils than in the Bunker and Vesta soils. Seedlings, especially those of western hemlock, grew better with than without forest floor. the N fertilizer reduced seedling growth of both species and, in some soils, reductions were more with than without forest floor. The P fertilizer improved seedling growth of both species in all soils and, with one exception, growth was much greater in the presence than in the absence of the forest floor. With both species, soil, forest-floor, and fertilization treatments affected concentrations and contents of the various shoot nutrients determined. The nutritional changes observed varied by nutrient and reflected differences in uptake of native and fertilizer nutrients, as well as changes in shoot dry weight. The results demonstrate the importance of the forest floor to growth and nutrition of Douglas-fir and western hemlock seedlings, especially when fertilizers are used.

Accession: 002355977

DOI: 10.1139/x92-163

Download PDF Full Text: Effect of forest floor on growth and nutrition of Douglas-fir and western hemlock seedlings with and without fertilizer


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Jablanczy, A., 1964: Influence of slash burning on the establishment and initial growth of seedlings of Douglas-Fir, Western Hemlock, and Western Red-cedar: a study of the effect of simulated slash burn on soil blocks from some sites of the coastal Western Hemlock zone. The surfaces of soil blocks from three sites ((a) swordfern, (b) moss, (c) Salal) were burned at two intensities and sown with the three tree species. The burning slightly increased germination of Douglas Fir and Western Hemlock, generally promote...

Radwan M.A.; Debell D.S.; Wilcox J.E., 1990: Influence of family and nitrogen fertilizer on growth and nutrition of western hemlock seedlings. U S Forest Service Research Paper PNW (426): 1-10

Radwan, M.A.D.bell, D., S., 1980: Effects of different sources of fertilizer nitrogen on growth and nutrition of western hemlock seedlings

Brix, H., 1970: Effect of light intensity on growth of Western Hemlock and Douglas-Fir seedlings. Describes the first-year growth response of Tsuga heterophylla and Pseudotsuga menziesii seedlings when grown under six light-intensity regimes (10-100% of full natural light) and on two soil types: (1) a clay-loam, and (2) a 1/1 mixture of peat-m...

Brix H., 1970: Effect of light intensity on growth of western hemlock g and douglas fir g seedlings. Canada Forestry Service Bi-Monthly Research Notes 26(4): 34-35

Schoenberger, M.M.; Perry, D.A., 1982: The effect of soil disturbance on growth and ectomycorrhizae of Douglas-fir and western hemlock seedlings: a greenhouse bioassay. In a greenhouse bioassay of soils from the central Oregon Cascades, Douglas fir seedlings had the greatest root wt. and total and ectomycorrhizal root tips per seedling when grown in soil from (1) unburned clear felled areas and least when grown i...

Little S.N.; Ohmann J.L., 1988: Estimating nitrogen lost from forest floor during prescribed fires in douglas fir western hemlock clearcuts. Nitrogen loss from consumption of forest floor was studied on 33 treatment blocks burned on 11 clearcuts in western Washington and western Oregon[USA]. In most cases, nitrogen concentration in forest floor did not change significantly following pr...

Shaw, D.C.; Weiss, S.B., 2000: Canopy light and the distribution of hemlock dwarf mistletoe GN Jones subsp tsugense aerial shoots in an old-growth Douglas-fir/western hemlock forest. Hemispherical photography was used to quantify the relationship between canopy light and the distribution of hemlock dwarf mistletoe (Arceuthobium tsugense (Rosendahl) G.N. Jones subsp. tsugense) aerial shoots in an old-growth Douglas-fir/western...

Nabel, M.R.; Newton, M.; Cole, E.C., 2013: Abundance of natural regeneration and growth comparisons with planted seedlings 10–13years after commercial thinning in 50-year-old Douglas-fir, Douglas-fir/western hemlock, Oregon Coast Range. Post-thinning natural regeneration in the Pacific Northwest of USA was evaluated 13<hsp sp="0.25"/>years after thinning 50-year-old Douglas-fir (<italic>Pseudotsuga menziesii</italic> [Mirb.] Franco var. <italic>m...

Shaw, D.C.; Flick, C.J., 2002: Seasonal variation in vertical distribution of Douglas' squirrel, Tamiasciurus douglasii, in an old-growth douglas-fir and western hemlock forest in the morning. Northwestern Naturalist (Vancouver). Winter; 833: 123-125