|
|
|
| Registros recuperados: 11 | |
|
| |
|
| |
|
| |
|
|
| Lens, F.; Sperry, J.S.; Christmas, M.A.; Rabaey, D.; Jansen, S.. |
| • Vulnerability to cavitation and conductive efficiency depend on xylem anatomy. We tested a large range of structure–function hypotheses, some for the first time, within a single genus to minimize phylogenetic ‘noise’ and maximize detection of functionally relevant variation. • This integrative study combined in-depth anatomical observations using light, scanning and transmission electron microscopy of seven Acer taxa, and compared these observations with empirical measures of xylem hydraulics. • Our results reveal a 2 MPa range in species’ mean cavitation pressure (MCP). MCP was strongly correlated with intervessel pit structure (membrane thickness and porosity, chamber depth), weakly correlated with pit number per vessel, and not related to pit area... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Acer; Cavitation resistance; Hydraulic conductivity; Pit structure; Rare pit hypothesis; Vessel distribution; Vessel wall thickenings; Wood density; 42.56. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/429474 |
| |
|
|
| Bellote, Antonio Francisco Jurado; Tomazello Filho, Mario; Dedecek, Renato Antonio. |
| The objective of this work was to evaluate the effect of mineral nutrients on tree growth and wood quality of Pinus taeda, on commercial plantation at 20 years after planting, on different soil types. Experimental plots were set, and from trees representing each population, stem disks were collected at different heights. Treegrowth, wood quality and growth ring parameters – tracheids diameter and radial density by X-ray densitometry – were analyzed and related to mineral nutrient contents. Results showed negative correlation among Mn and Mg stem disk contents and Pinus taeda tree growth; negative correlation was also obtained among Ca, Mg and Mn contents and tracheids dimensions and wood density. There was no correlation among N, P, K and B contents in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mineral nutrition; Wood density; Tracheids; Tree rings; Forest soils. Nutrientes minerais; Densidade da madeira; Traqueídeos; Anéis de crescimento; Solos florestais.. |
| Ano: 2010 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/132 |
| |
|
|
| SILVA,BRUNO GUSMÃO; LEMOS FILHO,JOSÉ PIRES DE. |
| O presente trabalho objetivou avaliar as relações hídricas em função da demanda evaporativa e da densidade da madeira em Swietenia macrophylla King, Joannesia princeps Vell., Inga edulis Mart., Licania tomentosa (Benth.) Fritsch e Centrolobium tomentosum Guill. ex Benth. O potencial hídrico foi determinado com uma câmara de pressão e a condutância estomática, com porômetro de difusão na estação chuvosa, na estação seca e nas situações transicionais. J. princeps foi a espécie que apresentou maiores valores de potencial hídrico no "predawn" (psiPD > - 0,25 Mpa), e I. edulis os menores valores (psiPD = - 1,5 MPa). J. princeps apresentou maiores valores de potencial hídrico durante o dia (psiMD > - 1,5 MPa), e os menores valores foram observados em S.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water potential; Conductance; Vapour pressure deficit; Wood density. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000500006 |
| |
|
| |
|
|
| Carvalho,Ellen Cristina Dantas; Martins,Fernando Roberto; Soares,Arlete Aparecida; Oliveira,Rafael Silva; Muniz,Celli Rodrigues; Araújo,Francisca Soares. |
| Xylem anatomical traits can provide insights regarding the mechanisms affecting the distribution of vascular plants across environmental gradients. In this study, we aimed to investigate the hypothesis that lianas occurring in semiarid environments have characteristics that maximize the xylem resistance to tension-induced cavitation along the root-stem-branch continuum. To gather information regarding the hydraulic architecture of the lianas, we analyzed several anatomical traits of wood: cross-sectional area occupied by the parenchyma (AP), fibers (AF), and vessels (AV); average vessel diameter (d); wood density (WD); pit diameter in the vessel wall (dpit); pit density (Npit), and potential hydraulic conductivity (Kp) in branches, stems, and roots of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Potential hydraulic conductivity; Vessel diameter; Wood anatomy; Wood density; Xylem. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200198 |
| |
|
|
| Sampaio,Everardo V.S.B.; Silva,Grécia C.. |
| Allometric equations to estimate total aboveground alive biomass (B) or crown projection area (C) of ten caatinga species based on plant height (H) and/or stem diameter at ground level (DGL) or at breast height (DBH) were developed. Thirty plants of each species, covering the common range of stem diameters (3 to 50 cm), were measured (C, H, DGL, DBH), cut at the base, separated into parts, weighted and subsampled to determine dry biomass. Wood density (p) of the stem and the largest branches was determined. B, C, H and p ranged from 1 to 500 kg, 0.2 to 112 m², 1.3 to 11.8 m, and 0.45 to 1.03 g cm-3. Biomass of all 10 species, separately or together (excluding one cactus species), could be estimated with high coefficients of determination (R²) using the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stem diameter; Height; Crown area; Wood density. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062005000400028 |
| |
|
|
| Candido,Helder Marcos Nunes; Miazaki,Ângela; Pontara,Vanessa; Bueno,Marcelo Leandro; Solar,Ricardo; Gastauer,Markus; Meira-Neto,João Augusto Alves. |
| ABSTRACT The growth-survival trade-off hypothesis states that functional traits of stem, wood, leaves and fruits govern acquisitive and conservative strategies of plant species that grow/survive differently in forests. We aimed to determine whether heterogeneity during the colonization of a secondary Atlantic Forest fragment causes differences in colonization-related traits and determines taxonomic composition of subplots. A total of 5,078 subplots were censused with leaf and fruit traits and height measurements being determined for each tree of each species, and with averaged-abundance-weighted values calculated for each subplot. A dendrogram was generated from the taxonomic composition of subplots using Sorensen similarity and UPGMA clustering. A total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Colonization; Fruit size; LEEP 50-ha plot; Leaf functional traits; Plant height; Wood density; Plant functional traits; Phytosociology. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100001 |
| |
|
|
| Scholz,Fabian G.; Bucci,Sandra J.; Goldstein,Guillermo; Meinzer,Frederick C.; Franco,Augusto C.; Salazar,Ana. |
| The objective of this study was to characterize and understand morphological and physiological variation in traits related to water economy, at the plant and stand level, along a gradient of tree density in a Neotropical savanna (Cerrado). Cerrado plots subjected to long-term fertilization and gallery forests were also included in the analysis to expand the axes of ecosystem variation. Consistent changes in stand level biophysical traits observed along the gradient of increasing tree density included a decrease in weighted-average wood density, and increases in leaf surface area per plant, leaf specific hydraulic conductivity, specific leaf area and stomatal conductance. A conceptual model of biophysical, morphological and physiological trait interactions... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gallery forest; Hydraulic architecture; Nutrients; Savannas; Specific leaf area; Wood density. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300006 |
| |
| Registros recuperados: 11 | |
|
|
|
