In order to improve the quality of cultivated land in Liaoning Province in the light of local conditions,medium-and low-yielding farmland in Liaoning Province a
Decentralized production model of small peasant household is main threat for China food safety source. By using the advantage of farmer professional cooperative
To build an ecologically civilized society,we should not only rely on scientific and technological progress,but also give full play to management progress. In t
Using the rainfall data at Jiangxi Meteorological Observatory and 1∶50 000 DEM data of Jiangxi,spatial distribution characteristics of the rainstorm process on
1∶250 000 contour was used to generate 0. 0012°( 4. 32 s) of grid DEM of the basin,to simulate flow line of slope surface and gradient line,automatically