Research of Vegetation Supply Water Index to Monitoring of Drought;

Impact of Drought on the Value of Littoral Wetland Ecological in the East of Cangzhou;

Impact of Extreme Drought on the Fluxes of CO_2, CH_4 and N_2O from Temperate Steppe　Ecosystems;

<Abstrcat>In dry sandstorm area,well water irrigation is a complicated system engineering,not only the measure on efficient water use was adopted,but also measures on the mode of water using to increase agricultural income in dry sandstorm area.

Affection of Aridity to Anatomical Structure on Apple Leaves;

Utilizing the agricultural aridity monitoring early warning and composite guarding skills on the Huang-huai plain,through demonstration,the multiple skills are performed in Puyang such as deep ploughing,straw overturning,seed drug-dressing,straw covering,irrigating limitedly,spraying aridity-preventing drug and wheat hot-dry wind drug.

Using the data of temperature,precipitation,ground evaporation from 11 meteorological stations in the valley of the Yellow River and the Huangshui River within Qinghai Province(shortened for Hehuang valley) from 1961 to 2002,we analyzed the characters of meteorological element change and aridity variety.