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Heating gradient and temperatures before sunrise 
The objective was to find a method which emphasizes soil characteris- 
tics (peaty soil with constant water contents) and which neglects the 
land use pattern. In fig. 9 the heating gradients are plotted versus 
the temperatures before sunrise. The ratio values of all classes form 
a large cluster. 
The diagram in fig. 9 shows, too, that this is especially due to the 
temperatures before sunrise. Differentiations within the temperature/ 
soil unit can be made utilizing the temperature gradients. 
The map of temperature gradients 
By the above method a map of the heating gradients was designed. This 
was done, because the comparison between map and nature is the only way 
to test the geoscientific usefullness of mathematic-statistic procedures. 
The map in fig. 10 consists of three main areas with basic temperatures 
(temperatures before sunrise) B (6,25 - 7,5 °c) GC (7,5 - 8,75 °c); at 
about 3/4 of the whole mapped area) and D (8,75 - 10 ?c). High basic 
temperature and.low gradient indicate high moisture contents. The re- 
lative large differences in the mapped area must be caused by diffe- 
rent vegetation because soil properties are similar for all fields. 
This effect results from the addition of the influences of soil moisture 
and vegetation. 
The unmown fields of the well drained area show the same gradient as 
the swamp. This is obviously the effect of the high grass; evapo- 
transpiration lowers surface temperatures during daytime, contrasting 
thus the mown fields. Thus the lower gradient simulates a higher 
moisture. 
The upper left part of the map (fig. 10) differs much from the described 
areas. Situated between swamp and grassland it shows the lowest basic 
temperatures (A and B) and the highest gradients. This area rises slowly