Seasonal changes in CO2 and H2O gas exchange of young European beech (Fagus sylvatica L.)

Stickan, W.; Zhang, Ximing

doi:10.1007/bf00226587

Cited by 27 publications

(12 citation statements)

References 18 publications

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“…Apparent quantum yield (a) was on average around 0.05 mol CO 2 (mol photon) 1 . Similar values of a have been reported by Stickan and Zhang (1992) for the same species. Both are in the range found for other temperate species (Sullivan et al 1996;Beaudet et al 2000).…”

Section: Discussionsupporting

confidence: 86%

Improvement of growth conditions and gas exchange of Fagus sylvatica L. seedlings planted below a recently thinned Pinus sylvestris L. stand

Aranda

Gil

Pardos

2004

Trees - Structure and Function

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Gas exchange and growth of beech seedlings planted in the understory of a recently thinned pinewood were recorded for 2 years. Relative irradiance was assessed by hemispherical photographs taken just after the thinning. Predawn water potential (Y pd ), daily gas exchange and chlorophyll fluorescence were measured several times during the two growing seasons. Maximum values of photosynthesis (A max ) and stomatal conductance to water vapour (g wvmax ) were established from daily data. Maximum quantum efficiency of PS II was recorded at dawn by taking the variable to maximum chlorophyll fluorescence ratio on dark adapted leaves (F v /F m ). In the middle of each summer, leaf nitrogen content and leaf mass per area were evaluated, and height growth and basal area increment were recorded at the end of the season. The thinning treatment removed half the trees and generated around 10% more available relative irradiance (GLF). This was followed by an increase in net photosynthesis at saturating PPFD (A sat ) and in maximum stomatal conductance to water vapour (g wvmax ). Moreover, specific leaf mass (SLM) and mass based nitrogen content (N m ) showed higher values for seedlings in the thinned stand. In both years, a positive relationship was established between the area based nitrogen content (N a ) and maximum net photosynthesis (A max ). In 1998, a year with a dry summer, seedlings suffered a significant drop in daily A max irrespective of the thinning regime. This was a response to an increase in stomatal limitation to net photosynthesis, g wvmax reaching the lowest value on dates with the highest drought. A lack of decrease of Fv/Fm confirmed the absence of significant non-stomatal limitation to A as a consequence of photoinhibition after opening the pinewood. A higher maximum quantum efficiency of open PS II centres (Fv/Fm) was registered in seedlings in the thinned stand. The significance of the differences between the treatments was stronger in the second year after thinning. In 1999, a year with frequent summer storms, water availability increased for seedlings growing under the thinned pinewood. Overall, the reduced pine overstory had a positive effect on physiological responses of beech seedlings, which was translated into improved seedling growth.

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Section: Discussionsupporting

confidence: 86%

Improvement of growth conditions and gas exchange of Fagus sylvatica L. seedlings planted below a recently thinned Pinus sylvestris L. stand

Aranda

Gil

Pardos

2004

Trees - Structure and Function

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“…European beech productivity has been shown to be only indirectly related to assimilation (Stickan and Zhang 1992). Moreover, in another experiment, the population from Abetone showed significantly higher height increment in spring than the population from Sicily (Borghetti et al 1993).…”

Section: Discussionmentioning

confidence: 97%

The response of European beech (Fagus sylvatica L.) seedlings from two Italian populations to drought and recovery

Tognetti

Johnson

Michelozzi

1995

Trees

109

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Abstract. The response of gas exchange, leaf chlorophyll content, relative fluorescence to decreasing water potential and recovery was followed in European beech seedlings from two Italian populations, differing in their native precipitation amounts. A population from Sicily (southern Italy) was selected as representative of a xeric population while a population from central Italy, Abetone, represented a mesic one. Dry-matter partitioning, leaf area, hydraulic sufficiency and xylem embolism were evaluated in both well-watered control plants as well as in plants subjected to drought. With the onset of water stress, values of water potential, leaf relative water content, net photosynthesis, leaf conductance and leaf chlorophyll concentration decreased concurrently while relative fluorescence remained unchanged. The population from Sicily showed a delay in effects of the imposed drought. Within 5 days of rewatering, leaf conductance was not fully recovered while all of the other parameters recovered to control levels, in both populations. Total, shoot, stem and root dry weight tended to be higher in seedlings from Abetone, even though both populations had similar photosynthetic rates. The population from Sicily exhibited about 3% greater (even if not significant) allocation to roots than the population from Abetone. Seedlings from Abetone had higher, but not significant, leaf specific conductivity and per cent loss in hydraulic conductivity than seedlings from Sicily. Drought resulted in a reduction of hydraulic conductivity and hydraulic sufficiency in seedlings from both populations. Photosynthesis of water stressed plants from both populations appeared to be reduced primarily by carbon dioxide diffusion through stomata and perhaps secondarily by changes in chlorophyll concentration rather than by efficiency of photosystem II. The effect of hydraulic factors on gas exchange during drought and recovery was not clearly evident.

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“…have been widely studied in a physiological context (Schulze 1972;Stickan and Zhang 1992;Epron and Dreyer 1993;Breda et al 1993), but information is very limited regarding southern countries (Rabella 1991). Some small stands in drier zones can be found scattered at the centre of the Iberian Peninsula.…”

Section: Introductionmentioning

confidence: 98%

Water relations and gas exchange in Fagus sylvatica L. and Quercus petraea (Mattuschka) Liebl. in a mixed stand at their southern limit of distribution in Europe

Aranda¹,

Gil²,

Pardos³

2000

Trees

128

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Water status and gas exchange of beech (Fagus sylvatica L.) and sessile oak [Quercus petraea (Mattuschka) Liebl.] were studied in a mixed stand in the Montejo de la Sierra forest (central Iberian Peninsula), one of the southernmost locations of both species in Europe. Gas exchange and water potential were measured in leaves at different canopy levels over several days in two growing seasons. The daily variation pattern was established with the measurements of three selected dates per year, representative of the soil moisture content situations in early, mid-and late summer. A similar daily time course of leaf water potential was found for the two species. Nevertheless, beech showed a most noticeable decrease of water potential at midmorning and maintained lower leaf water potential than oak in the early afternoon. In 1994 the sessile oak saplings showed higher values of predawn water potential (Ψ pd ) than beech at the end of summer, when soil moisture content was lowest (20 cm depth). Beech showed a significantly lower net assimilation rate (A) than sessile oak for leaves under the same PPFD. Maximum net photosynthesis values (A max ) for beech and sessile oak on sunny leaves were 10.1±0.4 µmol m -2 s -1 and 17.8±1.7 µmol m -2 s -1 respectively, and those for water vapour stomatal conductance (g wv ) were 265±31 mmol m -2 s -1 and 438±74 mmol m -2 s -1 . Differences in A and g wv between the two species were maintained throughout the day on all measurement dates. No clear relationship was found between water status of saplings and stomata performance; there was only a negative correlation between Ψ pd and g wvmid in beech. Nevertheless, a significant response to the air vapour pressure gradient between leaf and air was translated into stomata closure on an hourly basis, more intensively in beech.

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Seasonal changes in CO2 and H2O gas exchange of young European beech (Fagus sylvatica L.)

Cited by 27 publications

References 18 publications

Improvement of growth conditions and gas exchange of Fagus sylvatica L. seedlings planted below a recently thinned Pinus sylvestris L. stand

Improvement of growth conditions and gas exchange of Fagus sylvatica L. seedlings planted below a recently thinned Pinus sylvestris L. stand

The response of European beech (Fagus sylvatica L.) seedlings from two Italian populations to drought and recovery

Water relations and gas exchange in Fagus sylvatica L. and Quercus petraea (Mattuschka) Liebl. in a mixed stand at their southern limit of distribution in Europe

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