Climate change and its effects on agricultural ecology during the recent 40 years in Songnen Plain
松嫩平原40年气候变化及对农业生态影响的对策

Based on systematic analysis of 40 years' complete meteorological data from 30 stations as well as the agricultural output information in Songnen Plain,one of the dry farming regions in Northern China,it was concluded that the climate in this plain was actually warming up,which lead to the split up of the high production areas to south and to north in the plain,that is the high yield area of corn gradually moving to south,and wheat and bean to north.Thus the changes in agricultural production should be paid attention to when working out strategies for agricultural development.