correlation between precipitation and runoff, runoff and sediment discharge, but
precipitation is not the only factor that influence hydrology.
(3) During 1981-2009, vegetation coverage of Loess Plateau has been increased
obviously, especially since 2000. With increase of vegetation coverage, area
and intensity of vegetation cover increased. The vegetation coverage decreased
from southeast to northwest and the increase rate became larger since 2000.
There is a negative relationship between sediment discharge vegetation
coverage: with the increase of vegetation coverage, sediment discharge
decreased ( R
2 =0.6). As a result, vegetation is one of the main factors that
influence soil and water lose. Except vegetation, check dam is another factor
that can influence soil and water lose, and should be studied further.
Key words: The Loess Plateau, precipitation, runoff, sediment discharge, Erosion
Topography Index (ETI)
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