scholarly journals Special issue in honour of Prof. Reto J. Strasser - Seasonal variation and trade-off between frost resistance and photosynthetic performance in woody species

2020 ◽  
Vol 58 (SPECIAL ISSUE) ◽  
pp. 331-340 ◽  
Author(s):  
A. GAST ◽  
C. ROMERMANN ◽  
S.F. BUCHER
Keyword(s):  
Seasonal Variation ◽  
Frost Resistance ◽  
Woody Species ◽  
Photosynthetic Performance ◽  
Special Issue ◽  
Trade Off

scholarly journals Is the Seasonal Variation in Frost Resistance and Plant Performance in Four Oak Species Affected by Changing Temperatures?

Forests ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 369
Author(s):  
Maggie Preißer ◽  
Solveig Franziska Bucher
Keyword(s):  
Seasonal Variation ◽  
Chlorophyll Content ◽  
Functional Traits ◽  
Frost Resistance ◽  
Photosynthetic Performance ◽  
Leaf Thickness ◽  
Plant Performance ◽  
Deciduous Species ◽  
Leaf Functional Traits ◽  
Trade Off

Research Highlights: We found seasonal variation in frost resistance (FR) and plant performance which were affected by growth temperature. This helps to better understand ecophysiological processes in the light of climate change. Background and Objectives: FR and photosynthesis are important plant characteristics that vary with the season. The aim of this study was to find out whether there is a seasonal variation in FR, photosynthetic CO2 assimilation rates and leaf functional traits associated with performance such as specific leaf area (SLA), leaf dry matter content (LDMC), chlorophyll content, stomatal characteristics and leaf thickness in two evergreen and two deciduous species, and whether this is influenced by different temperature treatments. Additionally, the trade-off between FR and photosynthetic performance, and the influence of leaf functional traits was analyzed. By understanding these processes better, predicting species behavior concerning plant performance and its changes under varying climate regimes can be improved. Materials and Methods: 40 individuals of four oak species were measured weekly over the course of ten months with one half of the trees exposed to frost in winter and the other half protected in the green house. Two of these species were evergreen (Quercus ilex L., Quercus rhysophylla Weath.), and two were deciduous (Quercus palustris L., Quercus rubra L.). We measured FR, the maximum assimilation rate at light saturation under ambient CO2 concentrations (Amax), chlorophyll fluorescence and the leaf functional traits SLA, LDMC, stomatal pore area index (SPI), chlorophyll content (Chl) and leaf thickness. Results: All parameters showed a significant species-specific seasonal variation. There was a difference in all traits investigated between evergreen and deciduous species and between the two temperature treatments. Individuals that were protected from frost in winter showed higher photosynthesis values as well as SLA and Chl, whereas individuals exposed to frost had overall higher FR, LDMC, SPI and leaf thickness. A trade-off between FR and SLA, rather than FR and photosynthetic performance was found.

Special Issue: Trade-off Analysis of Software Quality Attributes

2005 ◽  
Vol 13 (4) ◽  
pp. 327-328 ◽  
Author(s):  
Claes Wohlin ◽  
Lars Lundberg ◽  
Michael Mattsson
Keyword(s):  
Software Quality ◽  
Quality Attributes ◽  
Special Issue ◽  
Trade Off

scholarly journals The Generality of Leaf Size versus Number Trade-off in Temperate Woody Species

2008 ◽  
Vol 102 (4) ◽  
pp. 623-629 ◽  
Author(s):  
Dongmei Yang ◽  
Guoyong Li ◽  
Shucun Sun
Keyword(s):  
Woody Species ◽  
Leaf Size ◽  
Trade Off

Seasonal variation in soil seed bank size and species composition of selected habitat types in Maputaland, South Africa

Bothalia ◽  
2007 ◽  
Vol 37 (2) ◽  
pp. 249-258 ◽  
Author(s):  
M. J. S. Kellerman ◽  
M. W. Van Rooyen
Keyword(s):  
South Africa ◽  
Seasonal Variation ◽  
Species Composition ◽  
Seed Bank ◽  
Soil Seed Bank ◽  
Woody Species ◽  
Forest Edge ◽  
Seed Banks ◽  
Habitat Types ◽  
Open Woodland

Seasonal variation in seed bank size and species composition of five selected habitat types within the Tembe Elephant Park. South Africa, was investigated. At three-month intervals, soil samples were randomly collected from five different habitat types: a, Licuati forest; b, Licuati thicket; c, a bare or sparsely vegetated zone surrounding the forest edge, referred to as the forest/grassland ecotone; d, grassland; and e, open woodland. Most species in the seed bank flora were either grasses, sedges, or forbs, with hardly any evidence of woody species. The Licuati forest and thicket soils produced the lowest seed densities in all seasons.  Licuati forest and grassland seed banks showed a two-fold seasonal variation in size, those of the Licuati thicket and woodland a three-fold variation in size, whereas the forest/grassland ecotone maintained a relatively large seed bank all year round. The woodland seed bank had the highest species richness, whereas the Licuati forest and thicket soils were poor in species. Generally, it was found that the greatest correspondence in species composition was between the Licuati forest and thicket, as well as the forest/grassland ecotone and grassland seed bank floras.

scholarly journals Diversity of used plant species for producing charcoal and its trade-off in Far-North Region, Cameroon

2017 ◽  
Vol 6 (2) ◽  
pp. 19-29
Author(s):  
G. Todou ◽  
M. Hassan ◽  
Akamba Ze ◽  
D. Kombo ◽  
S. Machewere ◽  
...  
Keyword(s):  
Woody Species ◽  
Production Data ◽  
Survey Questionnaire ◽  
Charcoal Production ◽  
Human Pressure ◽  
Trade Off ◽  
Far North ◽  
Multipurpose Species ◽  
Northern Regions ◽  
Phytogenetic Resources

 The Northern Regions of Cameroon belong to sudano-zambesian region. In these regions, woody species are scarce compared to Guinean-Congolese Region and they undergo the human pressure like abusive exploitation of plants. In order to contribute to valorization of phytogenetic resources and contribute to struggle desert progression in sahelian region, a study on plants diversity which are used to produce charcoal and its trade-off was carried out in Far-North Region of Cameroon. Census of plants species was made on the basis of semi-structured surveys through the producers of charcoal and identification of tree trunks on the sites of charcoal production. Data of trade of charcoal was collected by direct observation and a semi-structured survey questionnaire in Maroua. In total, 25 species grouped in 17 genera and 8 families have been recorded. Acacia and Combretum were the richest genera with four species each. They were quoted as multipurpose species which can be used elsewhere as fruits, timbers, medicinal plants or essential oils and exudates. In Maroua almost, 98 % of households use charcoal for heating. In the absence of the charcoal, up to 60 % of those use firewood, 18.46 % use domestic gas and 18.46% use kerosene. Because of poverty and unemployment, people of primary education are mostly charcoal sellers.  INTERNATIONAL JOURNAL OF ENVIRONMENTVolume-6, Issue-2, Mar-May 2017, Page: 19-29

The triangular space of abiotic stress tolerance in woody species: a unified trade‐off model

2020 ◽  
Vol 229 (3) ◽  
pp. 1354-1362
Author(s):  
Giacomo Puglielli ◽  
Michael J. Hutchings ◽  
Lauri Laanisto
Keyword(s):  
Abiotic Stress ◽  
Stress Tolerance ◽  
Abiotic Stress Tolerance ◽  
Woody Species ◽  
Trade Off

scholarly journals The roles of conduit redundancy and connectivity in xylem hydraulic functions

2020 ◽  
Author(s):  
Assaad Mrad ◽  
Daniel M Johnson ◽  
David M Love ◽  
Jean-Christophe Domec
Keyword(s):  
Graph Theory ◽  
Water Potential ◽  
Percolation Theory ◽  
Water Movement ◽  
Xylem Sap ◽  
Woody Species ◽  
Flowering Plants ◽  
Hydraulic Efficiency ◽  
Trade Off ◽  
Network Characteristics

Wood anatomical traits shape a xylem segment's hydraulic efficiency and embolism spread resistance due to declining water potential. Because xylem sap is in a metastable state, gas embolisms might spread within the sapwood conduits as water potential declines, inhibiting water movement. It has been known for decades that variations in conduit connectivity play a role in altering xylem hydraulics. However, evaluating the precise effect of conduit connectivity on hydraulic efficiency and embolism spread resistance has been elusive. Using graph theory, percolation theory, and computational modeling, we show that increases in conduit connectivity improves resistance to embolism spread in certain flowering plants without compromising hydraulic efficiency. The influence of conduit connectivity might explain in part why the hypothesis of the 'safety-efficiency' trade-off is weak among woody species with different xylem network characteristics. Overall, knowing how xylem network measures influence segment hydraulics is necessary to generalize trends linking anatomy and hydraulic function among woody species.

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