Based on field investigation and indoor analysis

the results showed thatOn the Loess Plateau region

recovering vegetation can improve remarkably the content of soil organic matter and available N

K etc.

and drop soil pH and bulk density

add the quantity of waterstable aggregate of soil

improve the productive capability of land

enhence the process of humification and illimerization;Available nutrients

clay and>0.25 mm aggregate are all rich in high forest land

however

bush grass land shows more acid and>0.05 mm microaggregate and less solidity.The benefit of high forest land is better than that of bush grass land in preventing soil deterioration.