For a long time it caused soil erosion serious relatively and the peoplein Guyuan County with quite low living level for the increasing population

rare plantation

poor soil and shortage of a Three Materials ". Having beenadjusted during 1983 to 1985 in Guyuan County for the rational land usestructure

the region is now with a higher productivity

an increased grainoutput and soil loss reduced greatly

the net income of the mass there hasbeen increased for two times. In accordance with the comprehensive work

the ratio for optimized structure of land use of farming

forestry andhusbandry is determined as 1:1:3. The key step to establish a soundagroecological model is to develop an available and efficient ecologicaleconomic structure of farming

forestry and husbandry.But if the soilconservation is performed only for soil conservation

it is impossible to solvethe problem as a whole.