Effects of long-term CO 2 enrichment and nutrient availability in Norway spruce. II. Foliar chemistry

Roberntz, Peter; Linder, Sune

doi:10.1007/s004680050003

Cited by 33 publications

(14 citation statements)

References 38 publications

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“…Low concentrations of these elements may reflect high levels of export of C compounds, as both may be part of the phloem loading process (Roberntz and Linder 1999), or be the result of their role as a counter ion to negatively charged C compounds (Marschner et al 1996). Overstorey removal will also reduce litter and throughfall inputs of these elements.…”

Section: Discussionmentioning

confidence: 98%

Nutrient status of Norway spruce stands subjected to different levels of overstorey removal

Granhus

Brække

2001

Trees

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Foliage nutrient concentrations of overstorey and understorey Norway spruce [Picea abies (L.)Karst.], and height growth and needle weights of understorey saplings, were studied in a 7-year period after harvest. The following treatments were applied on each of three sites 5 years prior to needle sampling: control with no cutting, partial cutting with 50-60% removal of basal area, and patch cut (25×25 m -0.063 ha clear-cut). Saplings on control plots had higher concentrations of K and Cu in current-year needles (C) than overstorey trees. Increased harvest intensity led to a reduction of K in C needles and Mg in (C+1) needles of saplings, and of B in both saplings (C, C+1) and overstorey trees (C+1). Sapling needle weights generally increased with harvest intensity, whereas no effect of foliage N status on needle weights could be detected. The growth response of saplings was explained by the interaction between foliage N status, quantified as average N concentration in C and (C+1) needles, and harvest intensity. The results illustrate that sufficient N supply is a key factor for the ability of advance regeneration to utilise the improved light condition associated with overstorey removal.

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Section: Discussionmentioning

confidence: 98%

Nutrient status of Norway spruce stands subjected to different levels of overstorey removal

Granhus

Brække

2001

Trees

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“…Within the realm of CO 2 research with forest trees, investigations of nutritional responses other than those of N have been infrequent, but where nutrients other than N were measured, the responses to elevated CO 2 were either not significant or most often smaller than those of N (Murray et al 1996;Hättenschwiler and Körner 1998;Gifford et al 2000;Walker et al 2000). A common explanation for reduced concentrations of plant nutrients under elevated CO 2 is dilution by larger concentrations of non-structural carbohydrates (Roberntz and Linder 1999;Körner 2000). However, this dilution would be the same for all nutrients and, thus, the decrease of the N:nutrient ratios indicates that the reduction in tree N goes beyond a simple dilution signal.…”

Section: Soil-dependent Co 2 Effects On Nutrient Accumulation In Beecmentioning

confidence: 96%

“…Usually, CO 2 enrichment reduces plant N concentrations (reviewed by Cotrufo et al 1998) and often increases the immobilization of N in soils (Niklaus et al 1998;Hungate et al 1999), indicating that elevated atmospheric CO 2 stimulates the competition of plants and microbes for N. The effects of CO 2 enrichment on other nutrients are less consistent. In plant tissues, they range from decreased to increased concentrations under elevated CO 2 (Roberntz and Linder 1999;Gifford et al 2000;Walker et al 2000). In the soil, reports on the impact of CO 2 enrichment on exchangeable nutrients other than N are scarce, but they suggest that these CO 2 effects are relatively small .…”

Section: Introductionmentioning

confidence: 97%

Elevated CO2 influences nutrient availability in young beech-spruce communities on two soil types

et al. 2002

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The objectives of this study were to investigate how different soil types and elevated N deposition (0.7 vs 7 g N ma) influence the effects of elevated CO (370 vs 570 µmol CO mol) on soil nutrients and net accumulation of N, P, K, S, Ca, Mg, Fe, Mn, and Zn in spruce (Picea abies) and beech (Fagus sylvatica). Model ecosystems were established in large open-top chambers on two different forest soils: a nutrient-poor acidic loam and a nutrient-rich calcareous sand. The response of net nutrient accumulation to elevated atmospheric CO depended upon soil type (interaction soil × CO, P<0.05 for N, P, K, S, Ca, Mg, Zn) and differed between spruce and beech. On the acidic loam, CO enrichment suppressed net accumulation of all nutrients in beech (P<0.05 for P, S, Zn), but stimulated it for spruce (P<0.05 for Fe, Zn) On the nutrient-rich calcareous sand, increased atmospheric CO enhanced nutrient accumulation in both species significantly. Increasing the N deposition did not influence the CO effects on net nutrient accumulation with either soil. Under elevated atmospheric CO, the accumulation of N declined relative to other nutrients, as indicated by decreasing ratios of N to other nutrients in tree biomass (all ratios: P<0.001, except the N to S ratio). In both the soil and soil solution, elevated CO did not influence concentrations of base cations and available P. Under CO enrichment, concentrations of exchangeable NH decreased by 22% in the acidic loam and increased by 50% in the calcareous sand (soil × CO, P<0.001). NO concentrations decreased by 10-70% at elevated CO in both soils (P<0.01).

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“…Concentrations were probably diluted as a result of CO 2 -induced stimulation of needle growth (increased structural carbon) and/or an accumulation of non-structural carbohydrates, e.g. starch (Roberntz and Linder 1999;Utriainen et al 2000;Liu et al 2004Liu et al , 2005. The growth response (also of Wne roots) to CO 2 suggests that N deWciency (limitation) was not acute, rather latent (Johnson et al 1998).…”

Section: Evects Of Elevated Comentioning

confidence: 96%

Nutrient contents and efficiencies of beech and spruce saplings as influenced by competition and O3/CO2 regime

et al. 2008

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Saplings of Fagus sylvatica and Picea abieswere grown under conditions of intra and interspeciWc competition in a 2-year phytotron study under combinations of ambient and elevated ozone (+O 3 which is 2 £ O 3 , but <150 nl l ¡1 ) as well as carbon dioxide concentrations (+CO 2 which is amb. CO 2 + 300 l CO 2 l ¡1 ) in a full factorial design. Saplings were analysed for various mineral nutrients in diVerent plant organs as well as biomass production and crown development. The study was based on the assumption that nutritional parameters important for growth and competitiveness are aVected by stress defence under limiting nutrient supply. The hypotheses tested were (1) that nutrient uptake-related parameters (a) as well as eYciencies in nutrient use for above-ground competition (b) of beech rather than spruce are impaired by the exposure to elevated O 3 concentrations, (2) that the eYciency in nutrient uptake of spruce is enhanced by elevated CO 2 concentrations in mixed culture, and (3) that the ability to occupy above-ground space at low nutrient cost is co-determinant for the competitive success in mixed culture. Clear nitrogen deWciencies were indicated for both species during the 2-year phytotron study, although foliar nitrogen-biomass relationships were not so close for spruce than for beech. O 3 stress did not impair nutrient uptake-related parameters of beech; thus hypothesis (1a). was not supported. A negative eVect of elevated O 3 (under amb. CO 2 ) on the N and P based eYciencies in above-ground space occupation (i.e. lower crown volume per unit of N or P invested in stems, limbs and foliage) of beech supported hypothesis (1b). It appeared that ozone stress triggered a nutrient demand for stress defence and tolerance at the expense of above-ground competition (trade-oV). Crown volume of beech under O 3 stress was stabilized in monoculture by increased nutrient uptake. In general, the +CO 2 -treatment was able to counteract the impacts of 2 £ O 3 . Elevated CO 2 caused lower N and S concentrations in current-year foliage of both tree species, slightly higher macronutrient amounts in the root biomass of spruce, but did not increase the eYciencies in nutrient uptake of spruce in mixed culture. Therefore hypothesis (2) was not supported. At the end of the experiment spruce turned out to be the stronger competitor in mixed culture as displayed by its higher total shoot biomass and crown volume. The amounts of macronutrients in the above-ground biomass of spruce individuals in mixed culture distinctly exceeded those of beech, which had been strongly reduced by interspeciWc competition. The superior competitiveness of spruce was related to higher N and P-based eYciencies in aboveground space occupation as suggested in hypothesis (3).

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Effects of long-term CO 2 enrichment and nutrient availability in Norway spruce. II. Foliar chemistry

Cited by 33 publications

References 38 publications

Nutrient status of Norway spruce stands subjected to different levels of overstorey removal

Nutrient status of Norway spruce stands subjected to different levels of overstorey removal

Elevated CO2 influences nutrient availability in young beech-spruce communities on two soil types

Nutrient contents and efficiencies of beech and spruce saplings as influenced by competition and O3/CO2 regime

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