Abstract:

Since the micro_meteorological characteristics including net solar radiation, soil temperature, soil moisture, precipitation, and wind speed are response factors of desertification, so our study was focused on two communities of desertification stage: Artemisia ordosica and cynanchum komarocii. Net solar radiation, soil moisture and wind speed were changed remarkably in the two communities because of the community component, structure, and cover degree. Net radiation (R _n) of Artemisia ordosica community was higher than that of Cynanchum komarocii community and a difference of soil moisture was also in existence. The depth of soil moisture that can be affected by the rain depends on the depth of precipitation: When the monthly precipitation was lower than 45?mm, Only the upper 40?cm soil moisture runs up where there most of the root system was distributed.Artemisia ordosica community has more stable soil temperature than Cynanchum komarocii community as well as more efficiency in weakening wind speed.

Key words: Erduosi, Desertification stage, Micro-meteorological, Artemisia ordosica, Cynanchum komarocii