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Books > Professional & Technical > Agriculture & farming > Forestry & silviculture: practice & techniques
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Management of Nutrition in Forests under Stress - Proceedings of the International Symposium, sponsored by the International Union of Forest Research Organization (IUFRO, Division I) and hosted by the Institute of Soil Science and Forest Nutrition at the Albert-Ludwigs-University in Freiburg, Germany, held on September 18-21, 1989 at Freiburg, Germany (Hardcover, Reprinted from WATER, AIR, AND SOIL POLLUTION, 54, 1991)
Loot Price: R5,984
Discovery Miles 59 840
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Management of Nutrition in Forests under Stress - Proceedings of the International Symposium, sponsored by the International Union of Forest Research Organization (IUFRO, Division I) and hosted by the Institute of Soil Science and Forest Nutrition at the Albert-Ludwigs-University in Freiburg, Germany, held on September 18-21, 1989 at Freiburg, Germany (Hardcover, Reprinted from WATER, AIR, AND SOIL POLLUTION, 54, 1991)
Expected to ship within 10 - 15 working days
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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, Raf. 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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