It is necessary to know the dynamics and rates of growth of Ulmus pumila thickets on abandoned agricultural lands and on urban plots after abandoned construction works. What methods to apply to get reliable informative data. In terrestrial conditions without aerial photography
For spatial structure, you can use:
1. DBH classes.
2. Isogram interpolation of individual tree distributions.
3. Single or double variable o-ring function.
4. Interspecific correlations between main tree species.
5. Etc. lol
See: Population Structure and Spatial Pattern of Main Tree Species in Secondary Betula platyphylla Forest in Ziwuling Mountains, China, Nature, Scientific Reports 4, Article number: 6873 (2014), doi:10.1038/srep06873
For growth rates, see:
Methods of modelling relative growth rate, Pommerening, A. & Muszta, A. For. Ecosyst. (2015) 2: 5. doi:10.1186/s40663-015-0029-4.
I hope this helps :)
All information is very important. But the task is a little different - we need to determine the pace and patterns of increasing the area of local thickets. I think this should be done by mapping local thickets. On the radial line do the counting areas 2 * 2 m across the same distance. Completely describe them. But I do not quite understand what to do next.
TLS (Terrestrial Laser Scanning) - a very precise inventory method, but very expensive :-(
Hemispherical photography - for canopy structure; simple, fast and effective method :-)
https://www.researchgate.net/publication/283488598_Tree_canopy_leaf_area_index_LAI_measurements_with_the_hemispherical_photography_at_a_Tuczno_forest
Article Tree canopy leaf area index (LAI) measurements with the hemi...
Thank you so much. Spherical attachments to the camera can be any or there are specific ones?
Unfortunately, you need to use a hemispherical lens or a special cap (horizontal viewing angle is 180 degrees);
for example: circural (NOT diagonal!) fisheye (https://www.sigmaphoto.com/lenses/fisheye-lenses) or Circular Fisheye conversion lens: DCR-FE180PRO (was discontinued its production in Jan/08), DCR-CF185PRO (It is necessary to adjust the field of view to 180 degrees)
and software;:
- WinScanopy (http://regent.qc.ca/assets/winscanopy_about.html) - probably the best ;-)
- Gap Light Analyzer (https://www.sfu.ca/rem/forestry/downloads/gap-light-analyzer.html) - freeware :-)
https://www.researchgate.net/publication/283505792_Zdjecia_hemisferyczne
Chapter Zdjęcia hemisferyczne
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