13 documents found, page 1 of 2

Development of a portable leaf photosynthesis and volatile organic compounds em...

Understanding how plant carbon metabolism responds to environmental variables such as light is central to understanding ecosystem carbon cycling and the production of food, biofuels, and biomaterials. Here, we couple a portable leaf photosynthesis system to an autosampler for volatile organic compounds (VOCs) to enable field observations of net photosynthesis simultaneously with emissions of VOCs as a function ...

Equações volumétricas para espécies comerciais madeireiras do sul do estado de ...

Dry and hot: The hydraulic consequences of a climate change–type drought for Am...

How plants respond physiologically to leaf warming and low water availability may determine how they will perform under future climate change. In 2015 – 2016, an unprecedented drought occurred across Amazonia with record-breaking high temperatures and low soil moisture, offering a unique opportunity to evaluate the performances of Amazonian trees to a severe climatic event. We quantified the responses of leaf w...

Yield modeling in sawing logs of Manilkara spp. (Sapotaceae) in sawmill in the ...

The aim of this study was to estimate the yield of sawing Manilkara spp. logs, to quantify the wood by products generated, to evaluate differences in the yield between the diameter classes and to adjust models to estimate the yield in lumber and to estimate the volume of the hollow part of the logs. Seventy-one logs were sampled and grouped into diameter classes. Log volumes were determined by the Smalian metho...

Methanol and isoprene emissions from the fast growing tropical pioneer species ...

Isoprene (Is) emissions by plants represent a loss of carbon and energy resources leading to the initial hypothesis that fast growing pioneer species in secondary tropical forests allocate carbon primarily to growth at the expense of isoprenoid defenses. In this study, we quantified leaf isoprene and methanol emissions from the abundant pantropical pioneer tree species Vismia guianensis and ambient isoprene con...

Tree climbing techniques and volume equations for Eschweilera (Matá-Matá), a hy...

The Eschweilera genus has great ecological and economic importance due to its wide abundance in the Amazon basin. One potential use for the Eschweilera genus is in forest management, where just a few trees are removed per hectare. In order to improve the forest management in the Amazon, this study assessed two critical issues: volume equations fitted for a single genus and the development of a non-destructive m...

Green leaf volatile emissions during high temperature and drought stress in a c...

Prolonged drought stress combined with high leaf temperatures can induce programmed leaf senescence involving lipid peroxidation, and the loss of net carbon assimilation during early stages of tree mortality. Periodic droughts are known to induce widespread tree mortality in the Amazon rainforest, but little is known about the role of lipid peroxidation during drought-induced leaf senescence. In this study, we ...

Demonstration of a strict molecular oxygen requirement of yellow latex oxidatio...

Plant-derived latex is widely used in rubber production and plays important roles in ecological processes in the tropics. Although it is known that latex oxidation from the commercially important tree Hevea brasiliensis, results in latex browning, little is known about latex oxidation in highly diverse tropical ecosystems. Here we show that upon physical trunk damage, yellow latex released from the canopy tree ...

Species-specific shifts in diurnal sap velocity dynamics and hysteretic behavio...

Current climate change scenarios indicate warmer temperatures and the potential for more extreme droughts in the tropics, such that a mechanistic understanding of the water cycle from individual trees to landscapes is needed to adequately predict future changes in forest structure and function. In this study, we contrasted physiological responses of tropical trees during a normal dry season with the extreme dry...

Volatile monoterpene ‘fingerprints’ of resinous Protium tree species in the Ama...

Volatile terpenoid resins represent a diverse group of plant defense chemicals involved in defense against herbivory, abiotic stress, and communication. However, their composition in tropical forests remains poorly characterized. As a part of tree identification, the ‘smell’ of damaged trunks is widely used, but is highly subjective. Here, we analyzed trunk volatile monoterpene emissions from 15 species of the ...