Antioxidation Defence System of Hedysarum mongolicum Turcz.under Drought Stress;

Thr response of Hedysarum mongolicum Turcz.

Using the artificial experiment, the response of soil drought stress and high CO2 concentration (700 μmol/mol)on some dominant species in Maowusu sandland plant community, such as Salix psammophila, Artemisia ordosica, Caragana intermedia and Hedysarum mongolicum.

Salix psammophyila,Artemisia ordosica,Hedysarum mongolicum and Caragana intermedia,based on their natural geographical distribution,hbitats and biological characteristics,and the results of principal component analysis and cluster analysis on their responses to simulated precipitations,could be classified into one type of deciduous shrub function with three sub-types:C.

The hyperparasite Sphaerellopsis filum parasitizing on Hedysarum mongolicum rust ( Uromyces hedysari mongolici) forms conidia after 10 days at the temperature of 20 ℃ on PDA,and yellow white spore horn was also produced after 12 days.

Focused on the hudrologic constants of sandy lands in Maowusu Sands,which were covered by artificial Hedysarum leave Shrub and Salie psammophila Shrub,the paper measures the mechanical composition and hydrologic constants were measured with methods of soil physics.

Wind tunnel test on effect of controlling windand deposited sand of geogrid sand-barrier;

The erosion-deposition characteristic of soil coagulant sand-barrier with different concentration and size treatment was measured under wind tunnel test and field test.

Long-term practice demonstrated that ① Setting up sand-barrier in aerial-seeding region can enhance the seeding effect,with a higher seedling rate of 36.