The mineral component

mechanical composition

physical and chemical properties

soil water content and variation of sandy soil in semi-humid region before and after amelioration are analyzed.The result shows the amount of fine sands and sub-clay increase

while coarse sands decrease after the sandy land is renovated by human through 4～5years.Also

the erosion resistance of sandy soil raise 6～10 times and the property of preserve moisture and fertility in sandy soil under human renovation is greatly improved.So the renovated sandy land is fit for vegatation growing

of which water content raises 50%～10%

and the organic matter increase 1～3 times. This study proves the possibility of sandy land to be renovated in semi-humid region.