西北干旱区乌鸦的生态作用及其保护措施

The Ecological Function and Protection of The Crow in The Northwest Arid Areas

鸦科鸟类在生态系统中有着消灭地下害虫、食腐尸、加速物质循环等重大有益生态作用,但因有刨食农作物种子的习性,而导致它们在我国西北城镇和农业区处于已经或濒临绝灭的状态,急需研制只杀虫而毒不死鸟兽的新拌种农药品种,以保护乌鸦等有益鸟类不致绝灭。

The crow plays more significant ecological function such as killing soil insect, eating putrid corpse and improving cycle of matter. The behavior of eating agricultural crops seeds led to near extinction of the crow in northwest town and agricultural area. It is urgent to research and produce some new kind of farm chemicals which could kill the soil insects but have not bad effect on the useful birds crown.