Fwd: FW: Impacts of hydraulic redistribution on grass–tree competition vs facilitation in a semi-arid savannah.

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Felipe Rocha Defavari

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Feb 27, 2018, 6:18:05 PM2/27/18
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Boa noite meus caros!! 

Segue a interessante circular da representada da Labcontrol, ICT International!! Forte abraço!! 

I just received this email and thought you might find it interesting.

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Impacts of hydraulic redistribution on grass–tree competition vs facilitation in a semi-arid savannah.

 

Dr. Greg Barron-Gafford, Principle Investigator of eco-physiology at Biosphere 2, and his team in the School of Geography and Development at the University of Arizona, have been researching the interactions between SFM1 Sap Flow Meters, Eddy Flux towers and Photosynthesis data to investigate Hydraulic Redistribution (HR). While this is a highly documented physiological phenomenon, the impact of Hydraulic Lift (HL) and Hydraulic Redistribution by trees on the functioning of other members of the ecosystem has not been extensively researched.

In an effort to evaluate both the positive (through HL) and the potentially negative effects (through Hydraulic Descent; HD) Dr. Barron-Gafford and his team asked two key questions: How do patterns of HR influence overstorey and understorey plant eco-physiological functions? and How do these patterns vary across timescales of an individual precipitation pulse to an entire growing season?

Please link to the New Phytologist publication doi: 10.1111/nph.14693 to discover the findings of this exciting research that has already been downloaded from the publishers website over 156 times and is listed in the top 25% of all research products published by Wiley.  You may be very surprised by the results. They may even cause you to challenge the current dogma about trees and their role in ecosystem functioning. You may also rethink your eco-physiological experimental design and monitoring protocols, and the need to include more non-destructive, and continuous high temporal resolution measurements such as sap flow.  

Regards
Alec Downey B.Sc. (For)
Head of Plant Science Applications & Research
ICT International Pty Ltd
Adjunct Senior Lecturer,
School of Plant Biology, University of Western Australia

 
 



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Abraços!

Felipe Rocha Defavari
Engº Florestal
(19) 99391-0757

Henrique Tozzi

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Mar 9, 2018, 7:16:24 AM3/9/18
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Olá a todos, 

Obrigado ao Felipe por compartilhar estudo tão importante. Gostaríamos de salientar que a boa ciência é feita em um esforço coletivo e que esta pesquisa também foi amparada por diversos outros equipamentos.

Neste trabalho, as medições de trocas gasosas em plantas foram feitas com o auxílio do Analisador de Fotossíntese LI-6400XT, enquanto as medidas de área foliar foram realizadas utilizando o Medidor de Área Foliar de Bancada LI-3100C.

Ainda, a troca líquida de CO2 com o ecossistema foi medida com o auxílio do Analisador de Gás por Infravermelho de Caminho Aberto LI-7500. Por fim, o fluxo de CO2 do solo foi calculado com o Medidor Automático de Fluxo de CO2 do solo LI-8100A.

Como podem ver, foi um trabalho bem abrangente, incluindo uma ampla variedade de análises, utilizando o que de mais avançado existe hoje disponível no mercado mundial.

Um abraço a todos,


Abraços!

Felipe Rocha Defavari
Engº Florestal

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