Investigation and Analysis on the Achievements of Returning Land for Farming to Forestry in Yongji City

In the light of various problems existing in the course of planting the persimmon in Yongji City,this paper probes into the optimization management of the persimmon from four aspects.

With the aid of the Farmland Resources Management Information System of Yongji City, the traditional geo-statistics, semivariance function, and the GS+ software, characteristics of spatial variation of 6 trace elements in the farmland soil in Yongji City were studied.

Study the Strategic Status of Yongji in Sui and T ang;

The Sui Dynasty Grand Canal s important projects——Tongji ditch and Yongji ditch;

CHEN Yin-que, WU Mi and LIU Yong-ji:Corresponding Poems;