About fine roots.
According to the RAINFOR-GEM manual (p. 32), all roots < 5 mm are fine roots.
However, I just had an issue with the definition of fine roots in a paper. In most of the existing literature, fine roots are defined as <2 mm, but as we capture all roots < 5 mm with the ICs, we include those as fine roots too. See paragraph 3.3.2 of this paper (in press): http://www.agu.org/journals/pip/gb/2011GB004082-pip.pdf
We have some problems with our Skye weather station at Allpahuayo, Loreto, Perú. I have been trying to install the datalogger software, but I could no do it because of our field laptop has windows7 64 bits operative system. I tried to download another software from Skye website and it did not work. I really apreciate any help.
Dear Yadvinder and team
I'm sending some pictures about for intensive monitoring carbon cycle in six plots. The instalation and repairin all experiments from Trocha Union to San Pedro.
GEM traits campaign in Peru
2013 holds exciting new adventures for the GEM team, with a large scale field campaing to collect information on forest ecosystems functions and traits along our Peruvian transect (NERC grant). We will continue to monitor our existing plots and we are installing several new plots along the gradient. Norma Salinas will be coordinating the effort, with the help of Walter Huaraca Huasco.
A new European Research Council grant will also allow us to deploy similar campaigns in Africa and Asia in the next few years.
Welcome to GEM
Dr. Lisa Bentley and Dr. Alexander Shenkin, who will both be working on the new Traits campaing in Peru.
Congratulations to Dr. Norma Salinas on her new postdoc.
We are happy to announce several new developments on the GEM website for 2013. A new library will be available in the coming weeks. You will be able to upload any papers you find relevant to your study and access all papers relevant to the GEM network. We are working on a discussion forum, so that you can follow and respond to specific discussion threads. Finally, we are working on getting the first set of data from the Andean and Amazonian plots online and publicly accessible (these will be available before June).
The GEM team will be running a photo competition this year. You will be able to submit photos under several categories (e.g. equipment, plot, humour, landscape, wildlife, etc.) and the results will be openly judged by the public. Please send us ideas on which categories you would like to see in the competition.
I don't know if you still need some photos, I have many from the higher sites in the Andes (especially Wayqecha). Here I upload a few for GEM. Let me know if you need more. I specially love the one of the sprouting Weinmannia...:)
We finished two plots TU4 and Ajcanaco. Tomorrow I'll be go to Pantiacolla with Percy, to explore and find 1000 m elevation and will return to Cusco Sunday o Monday with a good weather. Rest of my team will go to Wayqecha and after to San Pedro repair some experiments.
we had a course how install the dendrometer bands in here some photos our trip for tres cruces and Acjanaco. Tuesday I will send you the coordenates of 1000 m.
Hi Darcy and the Tambopata team. Great work and thank you for the pictures.
Just one comment: your soil respiration collars appear to be quite high above the ground. They could probably be half that height above the ground. Making the collars lower reduces the air space volume, and therefore increases the sensitivity of the CO2 flux measurement.
No need to change the collars now they are installed, but in future it is good to remember this (the same goes for all the other GEM sites). Keep up the great work and I look forward to visiting Tambopata in August!
Here some pictures from Tambopata field work at january, the work that was done was install new Ingrowth cores, measure soil respiration, stem respiration, drawing Rhizotrons, measure dendrometers and census plots.
The team consisted of Vilma, Sheyla, Marco, also we have the help of the resident naturalists of Explorer's Inn: Hannah, Jo, Becca and Tristan.
The minimum diameter we considered at Allpahuayo, Jenaro Herrera (Peru) and Ducke plots (Brazil) is 10 cm diameter, and it works very well. The trick is the way of dendrometer instalation, which should be standarized for getting the suitable form, it means the spring and the clips should have the exact size. Another thing I could see in Ducke was that the suitable clip material is aluminium which adjusts better to tree shape. Of course, there are some trees where it is a bit complicated to install, but this is a minimal amount.
A couple of interesting papers from Brazilian colleagues.
1. A look at mode of death of trees in Ducke, Manaus (a new GEM site) and application of metabolic scaling theory of tree growth. Small trees die from being outcompeted and fall in line with metabolic theory predictions, larger trees die from senesence or exogenous disturbance and do not fall in line with theory: http://is.gd/VDBnHT
2. A nice overview of the bamboo forests of SW Amazonia. Much of the long term disturbance we detected from satellite seems to be in the area of these bamboo forests: http://is.gd/O3Gxk3
Alex, Carlitos, Rudi, Flor, Jenifer and Jefferson finished installing a one-hectare plot in treeline between Acjanaco and Tres Cruces of the National Park of Manu.
The elevation is 3500 m (0, 0) and its coordinate are 13º 08' 50.7"S, 71º 37' 57.6" W.