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):  
2017 ◽  
Vol 6 (2) ◽  
pp. 19-29
Author(s):  
G. Todou ◽  
M. Hassan ◽  
Akamba Ze ◽  
D. Kombo ◽  
S. Machewere ◽  
...  

 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


AoB Plants ◽  
2019 ◽  
Vol 11 (6) ◽  
Author(s):  
Jun Sun ◽  
Mantang Wang ◽  
Min Lyu ◽  
Karl J Niklas ◽  
Quanlin Zhong ◽  
...  

Abstract The trade-off between leaf number and individual leaf size on current-year shoots (twigs) is crucial to light interception and thus net carbon gain. However, a theoretical basis for understanding this trade-off remains elusive. Here, we argue that this trade-off emerges directly from the relationship between annual growth in leaf and stem mass, a hypothesis that predicts that maximum individual leaf size (i.e. leaf mass, Mmax, or leaf area, Amax) will scale negatively and isometrically with leafing intensity (i.e. leaf number per unit stem mass, per unit stem volume or per stem cross-sectional area). We tested this hypothesis by analysing the twigs of 64 species inhabiting three different forest communities along an elevation gradient using standardized major axis (SMA) analyses. Across species, maximum individual leaf size (Mmax, Amax) scaled isometrically with respect to leafing intensity; the scaling constants between maximum leaf size and leafing intensity (based on stem cross-sectional area) differed significantly among the three forests. Therefore, our hypothesis successfully predicts a scaling relationship between maximum individual leaf size and leafing intensity, and provides a general explanation for the leaf size-number trade-off as a consequence of mechanical-hydraulic constraints on stem and leaf growth per year.


Phytotaxa ◽  
2018 ◽  
Vol 334 (1) ◽  
pp. 41 ◽  
Author(s):  
DANIEL B. MONTESINOS-TUBÉE ◽  
ASUNCIÓN CANO ◽  
LUIS F. GARCÍA-LLATAS ◽  
YINGZI JU ◽  
ANNELEEN KOOL

As part of botanical expeditions in the Amazonas region of North Peru, we found plants from the Central Andes (North Peru). Based on morphology and molecular data, the Peruvian population was described and illustrated here as a new species for Science, named Paronychia sanchez-vegae. The new species is compared with its most likely closest relative, P. andina from which differs by the larger size, its woody ramified stems, the glabrous leaf surface, shorter leaf size, shorter flowers and larger size of the ovary.


2020 ◽  
Vol 229 (3) ◽  
pp. 1354-1362
Author(s):  
Giacomo Puglielli ◽  
Michael J. Hutchings ◽  
Lauri Laanisto

2020 ◽  
Author(s):  
Assaad Mrad ◽  
Daniel M Johnson ◽  
David M Love ◽  
Jean-Christophe Domec

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.


2007 ◽  
Vol 95 (2) ◽  
pp. 376-382 ◽  
Author(s):  
DAVID KLEIMAN ◽  
LONNIE W. AARSSEN
Keyword(s):  

2012 ◽  
Vol 145 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Sarah L. Dombroskie ◽  
Lonnie W. Aarssen
Keyword(s):  

2003 ◽  
Vol 19 (3) ◽  
pp. 251-259 ◽  
Author(s):  
Julio V. Schneider ◽  
Daniela Zipp ◽  
Juan Gaviria ◽  
Georg Zizka

Changes in morphological and anatomical leaf characteristics of woody plant species along an altitudinal gradient as well as between a late-successional and mature upper montane rain forest were examined. For leaf size, the Raunkiaer-Webb classification system was applied. The mature-forest transect comprised eight plots of 0.1 ha between 2300 and 3300 m asl, the successional-forest transect, four plots between 2400 and 2750 m asl. The latter comprised structurally heterogeneous vegetation patches. For each plot the proportions of leaf size classes and of the different categories of leaf shape, margin, and apex were calculated. Leaf size and the proportion of drip-tips decreased with increasing elevation. Serrate leaf margins were more prominent at higher elevations. Stomatal density, leaf thickness and related anatomical characteristics did not show significant trends. Differences between the mature and successional forest plots were generally slight. The advanced age of the successional forest probably led to a convergent development of leaf characteristics.


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