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Site preparation alters biomass, root and ectomycorrhizal development of outplanted western white pine and Douglas-fir (1996)

Harvey, Alan E. ; Page-Dumroese, Deborah S. ; Jurgensen, Martin F. ; [et al.]

Springer

New forests 11 (1996), S. 255-270

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ISSN: 1573-5095

Keywords: reforestation ; mounding ; scalping ; plant competition ; herbicide ; root development ; northern Idaho ; Pseudotsuga menziesii ; Pinus monticola

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract This report documents impacts from manipulations of native forest soils and competing vegetation on development and ectomycorrhizal formation of outplanted western white pine and Douglas-fir in the Inland Northwest. Treatments were: 1) mounding surface horizons with competition left in place, 2) mounding surface horizons with subsequent physical or chemical control of competing vegetation, 3) scalping for control of competing vegetation, and 4) a control, or no postharvest disturbance. Treatments were applied on a low-altitude, relatively harsh site and on a higher altitude, more moderate site. Wich established seedlings, mounding with no competition control generally produced small seedlings (5–15g; both species) with low numbers of ectomycorrhizal short roots (21). Mounding with competition control produced large seedlings (20–48g) with moderate numbers of short roots (25). Scalping produced small seedlings (8–16g) with high numbers of short roots (41). The control also produced small seedlings (8–13g) but with a moderate number of short roots (27). Douglas-fir produced more short roots on the harsh than the moderate site. Western white pine produced high root to shoot ratios (above 0.60) in the mound with competition on the harsh site. Douglas-fir produced very high root to shoot ratios (above 1.0) in both the mound with no competition of the harsh site and in the mound with competition of the moderate site. Throughout, western white pine produced more ectomycorrhizae more rapidly than Douglas-fir. Ectomycorrhizal development and root and shoot weight of both conifers were adversely affected by competing vegetation.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00036785

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Site preparation alters soil distribution of roots and ectomycorrhizae on outplanted western white pine and Douglas-fir (1997)

Harvey, Alan E. ; Page-Dumroese, Deborah S. ; Jurgensen, Martin F. ; [et al.]

Springer

Plant and soil 188 (1997), S. 107-117

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ISSN: 1573-5036

Keywords: herbicide ; mounding ; plant competition ; reforestation ; scalping ; soil organic matter

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract This report documents root and ectomycorrhizal development on container-produced (1-0), outplanted, western white pine and Douglas-fir seedlings growing in site-prepared forest soils typical of the Inland Northwestern US. The following site preparations were used: 1) mounding organic and surface mineral horizons; 2) mounding with subsequent physical removal or chemical control of competing vegetation; 3) scalping to reduce competing vegetation; and, 4) a control or no post-harvest disturbance. Treatments were applied on relatively harsh and moderate sites in northern Idaho. Most ectomycorrhizae on the seedling population were found in the mineral substrates that dominated planting sites. However, compared to mineral substrates, highest seedling ectomycorrhizal tip counts were recorded in organic matter, particularly decayed wood or mixtures containing decayed wood. Strong ectomycorrhizal development was characteristic of western white pine. It supported highest ectomycorrhizal activity in organic substrates on the harshest treatments (scalps). Douglas-fir showed even stronger relative increases of ectomycorrhizae in organic substrates on harsh treatments. Three of the four common ectomycorrhizal morphological types were concentrated in mineral substrates with all treatments. A treatment-induced change of behavior was shown by the principal pine type. It occurred at highest numbers in organic substrates of the mound with competing vegetation treatment and in mineral substrates with the control. If relative availability to seedling roots was considered, organics (especially decomposed wood) were generally equal or superior to mineral substrates for supporting ectomycorrhizal activity on planted seedlings.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1004299928220

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