خيارات البحث
النتائج 1 - 10 من 492
Relationship between foliar injury and changes in antioxidant levels in red and Norway spruce exposed to acidic mists.
1991
Chen Y.M. | Lucas P.W. | Wellburn A.R.
Variation du taux de polyphenols dans les aiguilles d' epiceas (Picea abies), presentant differents degres de deperissement.
1986
Contour Ansel D. | Louguet P.
Changes in pigment concentration and composition in Norway spruce induced by long-term exposure to low levels of ozone.
1995
Mikkelsen T.N. | Dodell B. | Lutz C.
Regional variation in surface properties of Norway spruce and Scots pine needles in relation to forest decline.
1989
Cape J.N. | Paterson I.S. | Wolfenden J.
Phytol as a possible indicator of ozone stress by Picea abies.
1995
Ekeberg D. | Jablonska A.M. | Ogner G.
Effects of acid rain on growth and nutrient concentrations in Scots pine and Norway spruce seedlings grown in a nutrient-rich soil.
1995
Back J. | Huttunen S. | Turunen M. | Lamppu J.
Persistent effects of ozone on needle water loss and wettability in Norway spruce.
1990
Barnes J.D. | Eamus D. | Davison A.W. | Ro Poulsen H. | Mortensen L.
Nutrient response to diagnostic fertilization of Norway spruce Picea abies (L.) Karst plantations in western Quebec, Canada.
1990
Janicki W. | Jones A.R.C.
Impacts of (NH4)2SO4 deposition on Norway spruce (Picea abies [L.] Karst) roots
1999
Carnol, Monique | Cudlin, Pavel | Ineson, Phil
peer reviewed | The effects of enhanced (NH4)(2)SO4 (NS) deposition on Norway spruce (Picea abies [L.] Karst) fine root biomass, vitality and chemistry were investigated using root-free in-growth cores reproducing native organic and mineral soil horizons. The cores were covered and watered every 2 weeks with native throughfall or throughfall supplemented with NS to increase deposition by 75 kg ha(-1) a(-1) NH4+-N (86 kg ha(-1) a(-1) SO42--S). The in-growth cores were sampled after 19 months and assessed for root biomass, necromass, length, tip number, tip vitality and fine root chemistry. Root biomass and fine root aluminium (Al) concentration were negatively correlated, but NS deposition had no effect on root growth or root tip vitality. NS deposition caused increased fine root nitrogen (N) concentrations in the organic horizon and increased Calcium (Ca) concentrations in the mineral horizon. Fine root biomass was higher in the organic horizon, where fine root Al and potassium (K) concentrations were lower and Ca concentrations higher than in the mineral horizon. Results highlighted the importance of soil stratification on fine root growth and chemical composition.
اظهر المزيد [+] اقل [-]Fine root status and element contents in three stands of Norway spruce in the Krkonose mountains
2002
Godbold, D.L. (University of Wales, Bangor (United Kingdom). School of Agricultural and Forest Sciences) | Fritz, H.W. | Cudlin, P. | Bonifacio, E.
Fine root distribution was estimated in three spruce stands with different stages of forest decline. At all 3 sites in the 0-5 cm layer the density of living fine root mass exceeds the necromass. However, in the deeper soil layer necromass exceeds biomass by a factor of 2-4 at Modry Dul, ca. 3 at Alzbetinka and by more than 8 at Mumlavska Hora. The distribution of root density was reflected in the distribution of root length and the number of root tips in each soil layer for the 3 sites
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