It shows that the numbers of sediment bacteria ranged from 4.10×10 8 to 12.36×10\+8 cells·g -1 ,averaged 8.09×10\+8±2.17×10\+8 cells·g -1 ,and increased gradually with increasing cultural time.
Average contents of lead,cadmium,copper and iron in sediment are 44 mg/kg,2.63 mg/kg,62 mg/kg and 5.9×104mg/kg respectively. Vertical distribution of lead shows that its content has decreased in recent years.
The sum of heterotrophic bacteria was( 2.37±1.83)×10~7 cfu/L and Vibrio were (11.77±13.86)×10~5 cfu/L in cultural water, but in sediment surface the heterotrophic bacteria were (7.90±29.08)×10~8 cfu/L, the Vibrio (1.18±3.27)×10~7 cfu/L.
The results showed that total number of heterortrophic bacteria in the water body and sediment were (5.3—17.0)×10 5 CFU/ml and (1.0—1.5)×10 6 CFU/g (wet weight) respectively.
The variables studied were transport of sand, underlying surface roughness, windblown sediment, wind-sand flow structure, soil mechanical composition and amount of wind erosion.
At a height of 0-20 cm, the height increased while the sediment discharge percent of sand flux decreased; there were significant differences in the sand flow formation under different land-use types.
At the same time, better correlative relationship between runoff and sediment production and rainfall and rainfall intensity were testified by multiple regression, but the correlation decreased gradually with the increase of canopy density of forest.