Mechanism of Hydrology and Soil and Water conservation Effect of

Artificial Seabuckthorn Forest in Loess Hilly Region

Chen Yunming (Insititute of Soil and Water Conservation, CAS and MWR, 712100,Yangling)

Chen Yongqin (Zhengzhou college of water resources, 450045, Zhengzhou)

Abstract: Based on the study of hydrology and soil and water conservation effects of canopy, litter layer and root system and soil layer of artificial seabuckhthorn stands in semi-arid area of loess hilly and gully region. The results have showed as follow. Average intercepting rate of canopy on rainfall in 7~10 ages seabuckthorn stands is 8.5%. Intercepting maximum of litter layer of 5~10 ages seabuckthorn forest is 0.89 mm in single rainfall. Compared with farmland, mature and young seabuckhtorn stands can decrease soil cubic density in 0~50 cm and 0~25 cm depth of soil layer respectively. Litter self and coving litter layer above soil can increase the capability of soil anti-scour, the surface soil can avoid the erosion by rainfall to cover the litter layer excess 2 cm thickness on it. Seabuckthorn forest has the capability of increasing the soil anti-scouring and anti-eroding. The capability of anti-scour has a power relationship with the number of thin roots in the same soil layer and the capability of anti-erosion has relation with the content of humus in the same soil layer.

Key words: Artificial seabuckthorn forest loess hilly region hydrological effect soil and water conservation mechanism,