Abstract: In June 2007, the diurnal dynamics of light intensity, air temperature , air relative humidity, soil temperature, and surface soil (0〖KG-*2〗-〖KG-*7 〗5 cm) water content of five land use types in the typical Karst zone of Lingyu n City in Guangxi Zhuang Autonomous Region were observed. The results showed tha t different land use types altered the composition, coverage, and height of abov eground vegetation, which in turn changed the environment microclimate to differ ent degree. The microclimate quality was in the order of forestland>shrub land>g rassland>farmland>rock land. On rock land, the light intensity, air temperature, air relative humidity, soil temperature, and soil water content were higher, an d the diurnal variation of the five climatic factors was notable, with the micro climatic conditions changed towards drier and hotter. Compared with those on roc k land, the light intensity on forestland, shrub land, grassland, and farmland d ecreased by 964%, 520%, 170% and 442%, air temperature decreased by 30 1%, 202%, 127% and 178%, air relative humidity increased by 1292%, 572 %, 180% and 412%, soil temperature decreased by 115%, 8%, 25% and 55%, and soil water content increased by 426%, 332%, 157% and 140%, respecti vely. The five climatic factors on forestland and shrub land had lesser fluctuat ion, with the microclimate tended to cool and wet. Light intensity, air temperat ure, and soil temperature correlated positively with each other, and had negativ e correlations with air relative humidity and soil water content. A positive cor relation was observed between air temperature and soil water content.

Key words: re-vegetation, soil enzyme activity,  , slope,  , soil profile, gully Loess Plateau.