The harden ground and soil and water loss on the Loess Plateau
硬化地面与黄土高原水土流失

According to the defintion the concept of the harden ground,the harden ground is classified as road,town block and farmyard.Through analyzing erosion quantity and the capability of rain-water collection of different kinds of harden ground in the east of Gansu Province,by utilizing the formula which could testify the rain-water collection capability of the harden ground in the 400-600 mm rainfall area on the Loess Plateau,the paper points out that there is serious soil erosion particularly by the roads,towns and villages,which is related to the physiognomic phenomena of gullies on the Loess Plateau,since the rain-water collection of the harden ground is more effective than the natural ground on the Loess Plateau.It is argued that the rain-water collection capability is connected with the harden ground's characteristics,different ways making harden ground led to different kinds of rain-water collection and different kinds of soil erosion,even if this happens on the same type of the harden ground.The study holds that the increasing population,the enlargement of harden ground area,and the resultant more serious soil and water loss constituted one of the essential reasons for the aggravated soil erosion on the Loess Plateau in the historical period.Therefore,the future soil and water conservation work on the Loess Plateau should organically connect the work of prevention and control of soil and water loss with the solution of water shortage problem.Furthermore,the best resolution to the problem of water shortage on the Loess Plateau is to use the harden ground gathered water for industrial and agricultural,produation and domestic consumption.