The Modification of Temperature Caused by Groves of Trees in a City and Resulting Effects on Grove Tree Vitality
1974 Volume 38 Issue 3 Pages 25-28
Details
1974 Volume 38 Issue 3 Pages 25-28
It is generally recognised that temperature on a summer's day within a grove of trees (TG) is lewer than that outside it (TC).
The effect on temperature within such groves (ΔT=TC-TG) was measured on a sunny day between 10 A. M. and 6 P. M. in 1973 at about 30 places mainly in Osaka City using a mercury thermometer. The following indexes represent the day long variation in temperature within the sampled groves:
∫1810ΔTdt...The integral of ΔT from 10 A. M.to 6 P. M.
Max.(ΔT)...The maximum of ΔT.
αTcαT...The coefficient ratio belonging proportionally to TC and ΔT. αTcΔT=ΔT/ (Tc-β.) (The coefficient of correlation was added to each).
The following indexes represent conditions related to the previously mentioned 30 samples (groves or open spaces included):
G...Grove vitality estimated in 5 ranks by visual observation
R...The ratio of groves or tree-covered space
S...The area of open space
The following table showa the coefficient of correlation between the two indexes:
From this table, wefind high degree of correlation between V and ∫1810ΔTdtor Max.(ΔT). This fact should prove useful in developing park and open space policy.
