Thiago Sanna Freire Silva

tsfsilva -at- rc -dot- unesp -dot- br

Assistant Professor
Department of Geography
Geosciences and Exact Sciences Institute (IGCE)
São Paulo State University (UNESP)

Avenida 24-A, 1515
13506-900 Rio Claro, SP, Brazil
Tel: +55 (19) 3526-9208

1 Response to Contact

  1. Ned Fetcher says:

    Dear Dr. Thiago,
    With regard to your query on ECOLOG-L, the answer depends a bit on how you will use the equipment. If you need portability, then CID might have some advantages. If I were a novice at gas exchange I would pick the LI-6400. They provide excellent support and technical advice. Also they are very good about dealing with technical details involved with the measurements, so you can have fair confidence that your data are correct. You can always call them with any kind of problem. Two years ago I was in Alaska when the LI-6400 stopped functioning. I drove 160 km to where I could get mobile phone service and called LiCor. Rick Garcia, a senior engineer and plant scientist, spent about an hour on the phone with me while we debugged the problem. In a field setting, it actually helps that the unit is less compact as it is possible to get at the components more easily.
    For canopy measurements, the LI-2200 gives you a number (or several) whereas the CID device gives you an image which then has to be processed. So it depends a bit on your questions. I might lean slightly to the CID instrument because you can always reprocess the image whereas with the LI-2200 you are somewhat dependent on the assumptions built in to the software. In a forest you have to use 2 LI-2200’s, one above the canopy and one below it, and then match the readings afterwards. This can be tricky if lighting is changing as with moving clouds. For fisheye images like the CID uses, lighting is also critical; overcast days are best.

    Good luck,
    Ned Fetcher

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