Characters Of Soil Splash Erosion Of Typical Black Soil Region

In order to systematically understand the splash erosion characteristics of typical black soil zones and variation regularity,use the artificial rainfall to design different rainfall intensity and rainfall duration,comparative analysis of the spatial distribution,fraction of water-stable aggregate for the topsoil in a sloping farmland in the typical black soil zone with different rainfall conditions,study the splash erosion and selective characteristics of aggregates for the typical black soil under artificial rainfall condition in terms of splash erosion amount,fraction of water-stable aggregate,mean weight diameter(MWD) of aggregate,aggregate enrichment ratio(ER) and other indexes,research the regularity of splash erosion during the tillage period 8 year,30year,50 years and the untillaged natural secondary forests under artificial rainfall condition,through to the factorial analysis of the main soil property that effected character of splash erosion.The study could provide basic data for deeply understand the Erosion Process of black soil and provide references for further systematic study on the occurrence regularity of black soil erosion and soil loss control.The results showed that:Typical black soil showed a significant linear regression relation between splash erosion amount and rainfall intensity,then the Rainfall intensity＜46.53mm/h,the distribution of splash fragment is not obvious,which has a great influence for the in horizontal space.The splash erosion amount exhibited a significant correlation in growth curve model of Logistic with rainfall duration,rainfall duration11.30min was the dividing point between stage of splashing for dry soil and stage of splashing for mud,40.83min was the critical value for the maximum of Splash erosion rate.The splash erosion process completed for small size fraction to selection of rainfall duration,just between 30-40min.splash erosion amount and net transport amount for cylindrical collectors(upslope,down slope) from different collecting regions exhibited an significant correlation in exponential function with splash distance,and R2 values ranged from 0.8344 to 0.9911.Aggregate enrichment ratios of the soil changed between 0.00 and 1.79,and the critical particle size fraction of enrichment and depletion for splash erosion was 1.0mm.Fraction of water stable aggregate in the splashed fragment shows that the proportion of small size fraction increased with increasing splash distance in horizontal space,and 2-5mm aggregates appeared only in 0-5cm on upslope and 0～10cm on down slope, 1-2mm aggregates mostly distributed on upslope with a largest distributional distance of only 28 cm.MWD values ranged from 0.32mm to 0.80mm and declined with increasing splash distance,and MWD in 10-17cm on down slope was significant different from that in 0～10cm and 17-40cm.(P＜0.05)Fraction of water stable aggregate in the splashed fragment of different tillage period shows that the proportion of small size fraction increased with increasing splash distance in horizontal space factorial analysis show that the content of 2-5mm aggregates was the dominant factor which can effect splash erosion amount and variation characteristics of typical black soil,and others successively were the content of＞5mm aggregates,organic matter content,content of＜0.25mm aggregates.