With little rain

high temperature and serious soil erosion

the dry and hot river valley has very low soil water

the serious soil drification

found in other regains

which is being confronted in the course of construction of artificial vegetation in dry and hot river valley. Through using different measure of engineering preparation on slope

micro-slope was reconstructed

rainfall infiltration was strengthened

the results showed ; after reconstructing micro-slope with contour trench and contour terrace

the soil humidity environment of contour trench

contour terrace and their close slope obviously improved ; the difference of soil water of contour trench

contour terrace and natural slope slowly decreases from summit to fOOt of hill in dry reason

and the biggest difference was found

in the middle slope in raining reason; the soil water of contour terrace in western slope was much greater than that of northern and southern slope; within certain slope scope

contour terrace of smaller slope has greater soil water; contour terrace with much sand soil has greater soil water; after reconstructing micro-slope with contour trench and contour terrace

the accumulation time of soil water increases

which will benefit to the using of vegetation.