Dynamic changes in soil moisture content under farmland shelter belt system in Xuhuai Plain

Investigations were carried out of dynamic changes in soil moisture content under the farmland shelter belt system in different phenological phases of wheat.The results demonstrated that the law of the change in mean soil water content of farmland in different phenological phases of wheat is seedling stage>regreening phase>jointing stage>milking stage;Shelter belts have little influence on wheat during the seedling stage and regreening stage,but drastically competition for water occurs between the shelter belts and the wheat during the milking stage;Young forests can effectively increase soil water content in farmland,which is favorable to the growth of wheat.In terms of ability of competing for moisture with crops,mature forests are stronger than young forests.The competition is concentrated within the range of 0.2 times of the height of the tree.