从北京市延庆县沿１１０国道向南约１５公里，有一片望不到边的山林，山里从落着一个“黑土地庄园”，庄主名叫张效春。 今年４８岁的张效春，曾在黑龙江生产建设兵团当时１０年下乡知识青年，那段知青历史令他终生难忘，这使他对黑上地有着不尽的眷恋。 １９７９年返城回到北 Yanqing County, Beijing from along the 110 National Road south about 15 kilometers, there is a hopeless edge of the mountains, the mountains from falling with a “black land manor”, the owner named Zhang Xiaochun. Zhang Xiaochun, 48, who worked in Heilongjiang Production and Construction Corps for 10 years, was educated and educated youth. During that period, his history of educating young people made him unforgettable. Back to the city back to the north in 1979