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Characteristics of Soil and Water Losses on Different Land Uses in Low and Deep Hills of North Sichuan,China

【摘要】:正By observing(from2005 to 2008) the soil and water losses of runoff observation field at Shengzhong Reservoir in moderate erosion area of Low and Deep Hills of North Sichuan District,China,the paper studied the characteristics of soil erosion in different land use types,and expected to provide a theoretical basis to prevent soil and water losses in this area.The results showed as follows:Under different land use types,the orders of water runoff,runoff depth,runoff coefficient,runoff modulus and soil erosion were:terrace typeplant herbaceous typeafforestation type,and the order of critical rainfall runoff was: afforestation typeplant herbaceous typeterrace type.The regression analysis showed that the soil erosion of afforestation type and plant herbaceous type had a significant linear regression relationship with rainfall intensity and rainfall duration,and a highly significant relationship with rainfall.The soil erosion of terrace type had significant linear regression relationship with rainfall intensity,and very significant relationship with rainfall and rainfall duration.The path analysis showed that the absolute value of direct effect path coefficients on soil erosion of afforestation type was:rainfallrainfall intensityrainfall duration,and plant herbaceous type and terrace type of it were:rainfallrainfall durationrainfall intensity.The total absolute values of indirect effect path coefficient on soil erosion of different land use types were:rainfall durationrainfall intensityrainfall.

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