The contrastive lysimeter experiments of groundwater evaporations between winter wheat field and maize field, corn field and bare soil are conducted with water table of lm,1.

It s very important for us to study the moisture and heat fluxes quantitatively over the grassland and the bare soil in the semi-arid area.

The effects of vegetation type, rainfall intensity, surface crust, and weed cover on rainfall infiltration and runoff on grassland and bare land were studied under simulated rainfall conditions.

The result shows that the bare land was 20km2 from 1986 to 1998 and that newly increased bare land dropped to 1.

Two types of land surface have been taken into consideration, they are bare land without any vegetation on it and eucalyptus forest land without any undercover.

It analyzes the relationship of underground habitat pttern and vegetation structure of desert areas based on plant roots mass and deduces the ecological geology mechanism of desert vegetation patches pattern evolution based on that analysis.

Studies on the photosynthetic characteristics of the leaves of Phragmites communis in different dry land habitats in the Songnen Plains in China;

Dry matter storage and water soluble sugar content in different age classes rhizomes of Phragmites communis population in dry land habitat of Songnen Plain of China;