Local Heat Potential

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The local heat potential combines heat coordinates of slopes/aspects and altitude (Lujić 1960[1]) and is usually used for afforestation of bare lands. The first heat coordinate (E) covers all possible combinations of slope and aspect, grouped in nine heat degrees, according to total annual sum of solar radiation (Tab. 1).


Table 1. Heat degrees (coordinate E) as combination of slope and aspect (Lujić 1960[1]).

Aspect Slope (%) Coordinate E Aspect Slope (%) Coordinate E
N 0-7 7 NNE, NNW 0-12 7
8-23 6 13-29 6
24-38 5 30-44 5
39-55 4 45-65 4
56-75 3 66-90 3
76-107 2 91-133 2
108-183 1 134-173 1
NE, NW 0-18 7 ENE, WNW 0-25 7
19-36 6 26-55 6
37-58 5 56-93 5
59-90 4 94-148 4
91-133 3 149-173 3
134-173 2 ESE, SSW 0-143 7
E, W 0-47 7 144-173 6
48-119 6 SSE, SSW 0-14 7
120-173 5 15-173 8
Flat 0 7 S 0-12 7
SE, SW 0-13 7 13-51 8
14-52 8 52-107 9
53-60 7 108-173 8

The second heat coordinate (V) depends on altitude, with coldest sites on tree line (Tab. 2).


Table 2. Heat degrees (coordinate V) based on altitude (Lujić 1960[1]).

altitude 0-199 200-399 400-599 600-799 800-999 1,000-1,199 1,200-1,399 1,400-1,599 1,600-1,800
coordinate V 9 8 7 6 5 4 3 2 1

As the result, the coldest sites will have values of coordinates of 1,1; and the warmest site will have combination of 9,9. When local heat potential is defined for focal planting site, it is necessary to find sites with the same local heat potential and natural vegetation. It is assumed that the dominant tree species at site with similar value of local heat potential will be well adapted for focal planting site.

Use

The local heat potential is often used in Serbian reforestation programs (Ivetić and Devetaković 2016[2]).

References

  1. 1.0 1.1 1.2 Lujić R (1960) “The local heat factor” and its role in vegetation distribution. [In Serbian: "Lokalni toplotni faktor" i njegova uloga u rasporedu vegetacije]. Bulletin of the Faculty of Forestry 18, Doctoral thesis, University of Belgrade, Faculty of Forestry. 104 p.
  2. Ivetić V, Devetaković J (2016) Reforestation challenges in Southeast Europe facing climate change. Reforesta 1: 178-220. DOI: http://dx.doi.org/10.21750/REFOR.1.10.10