Effect of nitrogen and phosphorus nutrition on gas exchange of maize under drought conditions;

The effects of nitrogen and phosphorus on the water sensitivity and physiologica l parameters of summer maize;

Establishment and application of phosphorus variation model in the East China Sea;

The seasonal characters of the water flux and suspended substance,phosphorus in the water of input rivers of Three Gorges Reservoir(TGR) were discussed,and the their distributions among three major input rivers(Changjiang river,Jialingjiang river and Wujiang river) were studied,according to the survey conducted from Jan.