9780792312468 - management of nutrition in forests under stress: proceedings of the international symposium, sponsored by the international union of forest research ... on september 18–21, 1989 at freiburg, germany (3 Ergebnisse)
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Buch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - During the 1970s and 1980s, Sitka spruce (Picea sitchensis, Bong. Carr. ) was planted extensively on northern Vancouver Island (B. C. , Canada) to regenerate slashburned clearcuts previously occupied by old-growth Thuja p1icata, Donn, Tsuga heterophy11a, Ra…f. Sarg. , and an ericaceous unders tory shrub salal (Gaul ther ia sha11on, Pursh [CH sites 1 ) . The planted Sitka spruce grew well initially on these sites, but experienced nutritional stress and reduced growth 8 to 14 yr after planting (Germain, 1985; Weetman et a1. , 1990a,b). Accompanying the onset of the nutritional stress was the reestablishment of a complete ground cover of salal, and it has been suggested that there is a causal connection between these two temporally synchronous events (Weetman et al. , 1990a,b). Other ericaceous species have been implicated in nutritional stress in conifer plantations (Mallik, 1987; Robinson, 1972; Handley, 1963; Rose et a1. , 1983). Three hypotheses to explain this nutritional stress were tested in the study reported in this paper: (1) that salal competition for N can provide an adequate explanation for the observed nutritional stress; (2) that salal inhibits the availability of nutrients to seedlings by interfering with their mycorrhizae; and (3) that the fertility of these CH sites declines after 8 yr following clearcutting and slashburning due to the termination of the flush of nutrients (or 'assart effect') associated with this disturbance. A series of pot and field experiments was carried out to test these hypotheses. 1 2.
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Zustand: New. Proceedings of the International Symposium, held in Freiburg, Germany, September 18-21, 1989 Editor(s): Zottl, H. W.; Huttl, R. F. Num Pages: 676 pages, 16 black & white illustrations, biography. BIC Classification: TVR. Category: (P) Professional & Vocational; (UP) Postgraduate, Research & Scholarly. Dimension: 23…5 x 155 x 36. Weight in Grams: 1138. . 1991. Reprinted from WATER, AIR, AND SOIL POLLUTION, 54. Hardback. . . . . Books ship from the US and Ireland.
