We have just completed the installation of tree water use measuring equipment at the Bobiri field site in Ghana. This is one of our key intensively monitored sites which run in a wet-dry gradient in Ghana, from wet rainforest to woody savanna. Bobiri sits in the middle of the transect, a patch of forest reserve just east of Kumasi and conveniently close to the Forest Research Institute of Ghana (FORIG). With our FORIG colleagues we have been monitoring the carbon cycle of this forest in detail for the last five years, and have shown it to be the most productive tropical forest we have ever monitored. We are still trying to puzzle out why this site is so productive. I am with Lucy Rowland from Exeter University (who has worked on studying water flow in a drought experiment in Brazil for many years) and our Ghanaian colleagues Stephen Adu-Bredu, Akwasi Duah Gyamfi, Mickey Boakye and Patrick. Now, with the installation of water flux sensors, we are adding an understanding of the use of water by different trees. Our main measurements are done using sap flow sensors, which measure water flow (transpiration) through the stem by looking at the rate of dissipation of heat injected into the tree via electrodes. The more sap flow, the faster the dissipation. Installation involves hammering electrodes into the tree (often perched precariously on a ladder in the case of large buttressed trees). Initial data suggest phenomenal levels of water flow through these trees, much higher than we have seen at previous work in eastern Amazonia. This may be related to the high productivity and fertility that we see at the Ghana site, with the fast growth rates requiring high water use, at least in the wet season. These are amongst the first (and maybe the very first) sap flow measurements in the wet tropical forests of Africa, and there is much to learn in the coming years.
31 Comments
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4/7/2017 12:13:13 am
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18/11/2019 12:54:15 pm
The African forest are really taking a hit. I know that most people do not really care about it, and I am mad that it is the case. I hope that we can start to make an advocacy to help educate people. Information is key to making this a lot better. There are lots of cases where people just go with their lives without caring at all. The African forest is important to our entire world, and I really want it to survive.
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17/12/2019 12:56:02 am
I have seen so many stories like that and this is so sad. Being that I was brought up in a 3rd world country, I am very sad to see how we are running short on water.
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3/6/2021 04:06:54 pm
One key measure of water flow is 'base flow', the proportion of a stream or river not attributable to direct run-off from precipitation or melting snow. Base flow is often seen as the minimum supply of water on which people can safely rely.
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21/6/2021 07:42:58 am
I agree! All living organisms can be organized into producers and consumers, and those producers and consumers can further be organized into a food chain.
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5/7/2021 08:14:18 am
Absolutely! The relationship was negative and non-linear, suggesting that tree canopy development played a role. This meant that the relationship only held for stands with an open canopy, and is
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12/7/2021 08:13:19 am
I agree! Limitation of leaf transpiration and/or root water uptake resulted in drought enforced dormancy.
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22/7/2021 09:17:53 am
I agree! River flow is reduced in areas where forests have been planted and does not recover over time, a new study has shown.
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8/9/2021 07:07:02 pm
Is there a new article posted for this or the update? I'm just curious what are the results of measuring water flow.
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2/12/2021 04:34:02 am
I concur! Constraint of leaf happening or potentially root water take-up brought about dry season authorized lethargy.
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14/3/2022 07:34:32 am
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14/6/2022 02:05:06 pm
Planting the right tree in the right place is important for the long term health of the tree. Arborists can recommend the appropriate tree for the desired location, and assist in proper planting.
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AuthorYadvinder Malhi is an ecosytem ecologist and Professor of Ecosystem Science at Oxford University Archives
August 2019
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