Ecophysiological relations in two Douglas fir stands in the Netherlands

Evers, P.W.; Steingröver, E.G.; Jans, W.W.P.

doi:10.1111/j.1438-8677.1992.tb01313.x

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…The analysed needle samples included both current year needles and needles from previous years, which may have dampened seasonal changes in N pools in our observations. Minor differences between N concentrations in different age classes of Douglas fir have previously been observed at the Dutch site, older needles having slightly higher N values than young needles, as was also the case for sunlit compared to shade needles (Evers et al, 1991). Slightly higher N concentrations in older needles compared to current year needles was later confirmed by Boxman et al (1995) and Koopmans et al (1997).…”

Section: Differences In Seasonal and Spatial Variation Of Foliar N Cosupporting

confidence: 61%

Interactions between leaf nitrogen status and longevity in relation to N cycling in three contrasting European forest canopies

et al. 2013

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Seasonal and spatial variations in foliar nitrogen (N) parameters were investigated in three European forests with different tree species, viz. beech (Fagus sylvatica L.), Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) and Scots pine (Pinus sylvestris L.) growing in Denmark, the Netherlands and Finland, respectively. The objectives were to investigate the distribution of N pools within the canopies of the different forests and to relate this distribution to factors and plant strategies controlling leaf development throughout the seasonal course of a vegetation period. Leaf N pools generally showed much higher seasonal and vertical variability in beech than in the coniferous canopies. However, also the two coniferous tree species behaved very differently with respect to peak summer canopy N content and N retranslocation efficiency, showing that generalisations on tree internal vs. ecosystem internal N cycling cannot be made on the basis of the leaf duration alone. During phases of intensive N turnover in spring and autumn, the NH+ 4 concentration in beech leaves rose considerably, while fully developed green beech leaves had relatively low tissue NH+ 4 , similar to the steadily low levels in Douglas fir and, particularly, in Scots pine. The ratio between bulk foliar concentrations of NH+ 4 and H+, which is an indicator of the NH3 emission potential, reflected differences in foliage N concentration, with beech having the highest values followed by Douglas fir and Scots pine. Irrespectively of the leaf habit, i.e. deciduous versus evergreen, the majority of the canopy foliage N was retained within the trees. This was accomplished through an effective N re-translocation (beech), higher foliage longevity (fir) or both (boreal pine forest). In combination with data from a literature review, a general relationship of decreasing N re-translocation efficiency with the time needed for canopy renewal was deduced, showing that leaves which live longer re-translocate relatively less N during senescence. The Douglas fir stand, exposed to relatively high atmospheric N deposition, had by far the largest peak summer canopy N content and also returned the largest amount of N in foliage litter, suggesting that higher N fertility leads to increased turnover in the ecosystem N cycle with higher risks of losses such as leaching and gas emissions

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Section: Differences In Seasonal and Spatial Variation Of Foliar N Cosupporting

confidence: 61%

Interactions between leaf nitrogen status and longevity in relation to N cycling in three contrasting European forest canopies

et al. 2013

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“…The analysed needle L. Wang et al: Interactions between leaf nitrogen status and longevity samples included both current year needles and needles from previous years, which may have dampened seasonal changes in N pools in our observations. Minor differences between N concentrations in different age classes of Douglas fir have previously been observed at the Dutch site, older needles having slightly higher N values than young needles, as was also the case for sunlit compared to shade needles (Evers et al, 1991). Slightly higher N concentrations in older needles compared to current year needles was later confirmed by Boxman et al (1995) and Koopmans et al (1997).…”

Section: Differences In Seasonal and Spatial Variation Of Foliar N Cosupporting

confidence: 61%

Interactions between leaf nitrogen status and longevity in relation to N cycling in three contrasting European forest canopies

Wang¹,

Ibrom²,

Korhonen³

et al. 2012

Preprint

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Seasonal and spatial variations in foliar nitrogen (N) parameters were investigated in three European forests with different tree species, viz. beech (Fagus sylvatica L.), Douglas fir (Pseudotsuga menziesii, Mirb., Franco) and Scots pine (Pinus sylvestris L.) in Denmark, The Netherlands and Finland, respectively. This was done in order to obtain information about functional acclimation, tree internal N conservation and its relevance for both ecosystem internal N cycling and foliar N exchange with the atmosphere. Leaf N pools generally showed much higher seasonal variability in beech trees than in the coniferous canopies. The concentrations of N and chlorophyll in the beech leaves were synchronized with the seasonal course of solar radiation implying close physiological acclimation, which was not observed in the coniferous needles. During phases of intensive N metabolism in the beech leaves, the NH4+ concentration rose considerably. This was compensated for by a strong pH decrease resulting in relatively low Γ values (ratio between tissue NH4+ and H+). The Γ values in the coniferous were even smaller than in beech, indicating low probability of NH3 emissions from the foliage to the atmosphere as an N conserving mechanism. The reduction in foliage N content during senescence was interpreted as N re-translocation from the senescing leaves into the rest of the trees. The N re-translocation efficiency (ηr) ranged from 37 to 70% and decreased with the time necessary for full renewal of the canopy foliage. Comparison with literature data from in total 23 tree species showed a general tendency for ηr to on average be reduced by 8% per year the canopy stays longer, i.e. with each additional year it takes for canopy renewal. The boreal pine site returned the lowest amount of N via foliage litter to the soil, while the temperate Douglas fir stand which had the largest peak canopy N content and the lowestηr returned the highest amount of N to the soil. These results support the hypothesis that a high N status, e.g. as a consequence of chronically high atmospheric N inputs, increases ecosystem internal over tree-bulk-tissue internal N cycling in conifer stands. The two evergreen tree species investigated in the present study behaved very differently in all relevant parameters, i.e. needle longevity, Nc and ηr, showing that generalisations on tree internal vs. ecosystem internal N cycling cannot be made on the basis of the leaf habit alone

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“…Despite other reports that Douglas fir is fairly resistant to ozone (Davis & Wood, 1972), the results of our field experiments show that photosynthesis may be affected at ozone concentrations of 200 fig m "^ after only 9 d fumigation. Evers, Steingrover & Jans (1992) also demonstrated that photosynthesis was affected by relatively low ozone concentrations in a field experiment with mature Douglas fir. Photosynthesis of 1-yr-old needles appeared to decrease almost immediately with ozone concentrations above 140//gm^''.…”

Section: Discussionmentioning

confidence: 99%

Effects of short‐term ozone exposure on the carbon economy of mature and juvenile Douglas firs [Pseudotsuga menziesii (Mirb.) Franco]

Smeulders¹,

Gorissen²,

Joosten³

et al. 1995

New Phytologist

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Ecophysiological relations in two Douglas fir stands in the Netherlands

Cited by 4 publications

References 8 publications

Interactions between leaf nitrogen status and longevity in relation to N cycling in three contrasting European forest canopies

Interactions between leaf nitrogen status and longevity in relation to N cycling in three contrasting European forest canopies

Interactions between leaf nitrogen status and longevity in relation to N cycling in three contrasting European forest canopies

Effects of short‐term ozone exposure on the carbon economy of mature and juvenile Douglas firs [Pseudotsuga menziesii (Mirb.) Franco]

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