森林立地学会誌 森林立地36（2）,1994, 73〜79
資 料
乾燥地における植生の微気候緩和
−中国北西部における温湿度測定の数例から−
斉 藤 昌 宏・谷 本 丈 夫
Masahiro SAITO and Takeo TANIMOTO : Moderation of micro-climate by vegetation
in an arid region -Temperature and
humidity in the northwest part of China-
Recently, we are studying on the relation between
the vegetation and its environment in an arid area in northwest of China. In
this paper, we reported some results on the measurement of air temperature and
relative humidity which were collected in August and September from different
areas of Xinjiang Uygur Autonomous Region and Gansu Province in China. Values
of moisture per dry air were read out as another humidity indicator by the
psychrometric chart based on the relationship between temperature and relative
humidity. In comparison, the diurnal ranges of temperature in the desert of
Xiaotang, especially near the ground, are larger than those in the oasis of
Aksu. Moisture in the oasis is generally slightly higher than in the desert. It
is thought that conditions in areas without vegetation show more clear diurnal
variation of air temperature than those in oasis. Differences on temperature
and humidity were not apparent from areas with sparse stand of Populus to areas with sparse Tamarix scrub on a river side, and as
the remaining Populus stands became
fragmentary and sparse in the desert areas. In some cases, however, values of
temperature were almost lower, and values of air moisture were higher in Populus stands than outside the stands.
The tendency that desert areas were more hot and dry than oases was clear based
on the measurements done intermittently for one day trip from Aksu to Korla. As
big cities produce “heat-islands”, oases produce “moist-islands” in the arid region because they include wide and well-cultivated
areas.