Study on the Micrometeorological Control with Woods during Summer

Abstract

We observed the micrometeorology at the inside and outside of woods in order to investigate the micrometeorological control with woods. The results of this observation were summarized as follows:
1) The amount of the global solar radiation on the ground surface of the woods, above the canopy of the woods and on the surface of bare ground [CONT.] were 15.0, 414.53, and 440.96 [cal/cm²· Eday], respectively.
2) The fluctuation of air temperatures and earth temperatures except for the earth temperature at the depth of 50 cm closely correlated with the amount of the global solar radiation both on clear day and on cloudy day. It seems that the temperature control with woods especially effected on the diurnal range of the earth temperature at the depth of 5 cm. The diurnal ranges of the air temperature of the inside were smaller than those of the outside at the same height on clear day.
3) In the soil moisture at the depth of 10 cm, the pF values of the inside were lower than those of the outside in daytime on clear day, but there were not significant differences in pF values on cloudy day.
4) In the velocity of sap flow of Chamaecyparis obtusa, which is the index of the transpiration by woods, the diurnal range of the velocity on clear day was a little larger than that of the velocity on cloudy day.
5) The profile of wind speed was changed significantly and the weaker region of wind speed was found at the height of 2.53m.