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Acid Rain - Deposition to Recovery pp Cite as. Douglas fir [ Pseudotsuga menziesii Mirb. Franco] shoots from mature trees were collected from two sites of contrasting soil pH: the Glendon campus of York University in Toronto, Canada pH 6. Four elements detected, potassium, phosphorus, sulphur and chlorine, were ubiquitous in the needle tissues from both sites. Manganese was infrequently found in needle tissues from the Fr.

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Flea: Needles

Acid Rain - Deposition to Recovery pp Cite as. Douglas fir [ Pseudotsuga menziesii Mirb. Franco] shoots from mature trees were collected from two sites of contrasting soil pH: the Glendon campus of York University in Toronto, Canada pH 6. Four elements detected, potassium, phosphorus, sulphur and chlorine, were ubiquitous in the needle tissues from both sites.

Manganese was infrequently found in needle tissues from the Fr. Calcium was localized most heavily in the outer tangential wall of the hypodermis and also in the epidermal walls. Silicon Si concentrations were higher in the Fr.

The epidermis, hypodermis and mesophyll of needles from the Fr. Aluminium was distributed fairly evenly throughout the tissues, and there were few major sites of concentration. Unable to display preview.

Download preview PDF. Skip to main content. Advertisement Hide. This is a preview of subscription content, log in to check access. Augusto, L. Impact of tree species on soil solutions in acidic conditions. Annals of Forest Science, 58, CrossRef Google Scholar. Bartoli, F. The biogeochemical cycle of silicon in two temperate forest ecosystems. Hallberg Ed. Ecological Bulletin Stock-holm , 35, Google Scholar.

Beaton, J. Concentration of micro-nutrients in foliage of three coniferous tree species in British Columbia. Soil Science Society of America Proceedings, 29, Canny, M. Transfusion tissue of pine needles as a site of retrieval of solutes from the transpiration stream.

New Phytologist, , Crawford, R. Degradation of serpentine and muscovite rock minerals and immobilization of cations by soil Penicillium spp. Phyton-Annales Rei Botanicae, 40, Curt, T. Douglas fir root biomass and rooting profile in relation to soils in a mid-elevation area Beaujolais Mounts, France.

Plant and Soil, , Farrar, J. Trees in Canada, 5th edn. Preferential flow revealed by hydrologic modeling based on predicted hydraulic properties. Soil Science Society of America Journal, 68, Godde, D. Hodson, M. Mineral deposition in the needles of white spruce [Picea glauca Moench. Annals of Botany, 82, Journal of Inorganic Biochemistry, 76, Aluminium localization in conifers growing on highly acidic soils in Ontario, Canada.

In Proceedings of the international symposium on impact of potential tolerance of plants on the increased productivity under aluminium stress pp. X-ray microanalytical studies of mineral localization in the needles of white pine Pinus strobus L. Annals of Botany, 89, Hosie, R. Native trees of Canada 8th edn. Toronto: Fitzhenry and Whiteside. Jentschke, G. Does soil acidity reduce subsoil rooting in Norway spruce Picea abies? Plant and Soil, , Mauseth, J.

Plant anatomy p. Sangster, A. Silicon and aluminium codeposition in the cell wall phytoliths of gymnosperm leaves. Colin Eds. Lisse, The Netherlands: A. X-ray microanalytical studies of mineral composition in cell walls of needle tissues of American Larch [Larix laricina Du Roi K. Koch] and European Larch [L. Labreque Ed. Montreal, Canada: Isabelle Quentin. Stefan, K. Forest foliar condition in Europe - Results of large scale foliar chemistry surveys survey and data from previous years.

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Douglas J. Needles typically referred to as just Needles was an acquaintance of Marty McFly and his girlfriend Jennifer Parker though likely not a friend. Unlike Biff Tannen , who typically bullied Marty's father George into getting what he wanted, Needles appeared more of a rival to Marty who could goad Marty into doing foolish things by calling him " chicken ".

The Back to the Future film trilogy and subsequent animated series feature characters created by Robert Zemeckis and Bob Gale. The lead character of the series is Marty McFly. During the course of the trilogy, he travels through time using a DeLorean time machine invented by his friend Emmett Brown and encounters the villain, Biff Tannen , in several different time periods and visits his family ancestors and descendants. Marty travels between the past and the future, encountering his ancestors and descendants. Marty and his friend Doc Brown help restore the space-time continuum while encountering Biff Tannen or members of the Tannen clan at various points in time.

People/Characters: Douglas J. Needles

Morphological differences between old-growth trees and saplings of Douglas-fir Pseudotsuga menziesii Mirb. Franco may extend to differences in needle anatomy. We used microscopy with image analysis to compare and quantify anatomical parameters in cross sections of previous-year needles of old-growth Douglas-fir trees and saplings at the Wind River Canopy Crane site in Washington and at three sites in the Cascade Mountains of Oregon. We also compared needle anatomy across a chronosequence of , , and year-old Douglas-fir trees from the Wind River site. Anatomy differed significantly between needles of old-growth trees and saplings at all sites, suggesting a developmental change in needle anatomy with increasing tree age. Compared with needles of old-growth trees, needles of saplings were longer and had proportionately smaller vascular cylinders, larger resin canals and few hypodermal cells. Astrosclereids, which sequester lignin in their secondary cell walls and occupy space otherwise filled by photosynthetic cells, were scarce in needles of saplings but abundant in needles of old-growth trees.

X-ray Microanalysis of Needles from Douglas Fir Growing in Environments of Contrasting Acidity

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Douglas J. Needles Ph.D.

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Needle anatomy changes with increasing tree age in Douglas-fir.

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Photos. Michael J. Fox and Flea in Back to the Future Part II () Middle-Aged Marty: And if it doesn't work Needles, I could get fired! It's *illegal*! I mean.

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