@Article{VinyaMaBrFiBrAr:2018:EvWaCo,
author = "Vinya, Royd and Malhi, Yadvinder and Brown, Nick D. and Fisher,
Joshua B. and Brodribb, Timothy and Arag{\~a}o, Luiz Eduardo
Oliveira e Cruz de",
affiliation = "{Oxford University Centre for the Environment} and {Oxford
University Centre for the Environment} and {University of Oxford}
and {University of Tasmania} and {Jet Propulsion Laboratory} and
{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Seasonal changes in plant–water relations influence patterns of
leaf display in Miombo woodlands: evidence of water conservative
strategies",
journal = "Tree Physiology",
year = "2018",
volume = "0",
pages = "1--9",
keywords = "hydraulic conductivity, leaf phenology, Miombo woodlands,
plant–water relations, xylem safety margin.",
abstract = "Water availability has frequently been linked to seasonal leaf
display in seasonally dry ecosystems, but there have been few
ecohydrological investigations of this link. Miombo woodland is a
dominant seasonally dry tropical forest ecosystem type in southern
Africa; however, there are few data on the relationship between
seasonal dynamics in plantwater relations and patterns of leaf
display for Miombo woodland. Here we investigate this relationship
among nine key Miombo woodland tree species differing in drought
tolerance ability and leaf phenology. Results of this study showed
that seasonal patterns of leaf phenology varied significantly with
seasonal changes in stem water relations among the nine species.
Leaf shedding coincided with the attainment of seasonal minimum
stem water potential. Leaf flush occurred following xylem
rehydration at the peak of the dry season suggesting that
endogenous plant factors play a pivotal role in seasonal leaf
display in this forest type. Drought-tolerant deciduous species
suffered significantly higher seasonal losses in xylem hydraulic
conductivity than the drought-intolerant semi-evergreen tree
species (P < 0.05). There was a significant and positive
correlation between species drought tolerance index and species
seasonal loss in hydraulic conductivity (P < 0.05), confirming the
ecological role of long-distance xylem transport in this
seasonally dry tropical forest. Our results reveal that water
stress in seasonally dry tropical forests selects for water
conservative traits that protect the vulnerable xylem transport
system. Therefore, seasonal rhythms in xylem transport dictate
patterns of leaf display in seasonally dry tropical forests.",
doi = "10.1093/treephys/tpy062",
url = "http://dx.doi.org/10.1093/treephys/tpy062",
issn = "0829-318X",
language = "en",
targetfile = "vinya_seasnal.pdf",
urlaccessdate = "27 abr. 2024"
}