A Study On Slope Farmland And Infiltration Runoff And Soil Erosion In The West Region Of Heilongjiang Province

Water and soil resource are important substantial basic of people's subsistence and development,especially are essential conditions of agriculture production, a mass of water and soil loss became a global bionomics question. The water and soil loss not only bring on entironment worsement,but also reduced the capacity of ground yield by destroy surface layer of soil. According to the data provided by Water Department of Helongjiang Province,we can see that there is 140 million mus farmlands in Heilongjiang province, but 80 million mus thereinto has a water and soil loss problem. Furthermore,27.1% land has water and soil loss in the 279.5 thousand square kilometer blackland zone of Heilongjiang. So prevent and control water and soil loss, conduct studies on law of water and soil loss are necessary.This paper through field test and theory research in the west of Heilongjiang province, analyze the water and soil loss regulation of slope farmland in blackland. Established slope farmland infiltration model and runoff model. Evaluate the slope farmland water and soil under different crop and different cultivation treatment. The locale experiments were made in Dongxing of Gannan county of Qiqihaer city in Heilongjiang province from 2003 to 2005,The primarily results were display as follows:1. The infiltration test showed that the conventional experimentation of infiltration only test the soil character, hard to describe the process of soil percolation; The respective infiltrated volume is 65.85mm and 42.03mm of the deeply vibrating loosen soil and the no deeply vibrating loosen soil in 60 minutes,the former is 1.57 times than the latter,it means that the infiltration characteristics of deeply vibrating loosen soil is higher than no deeply vibrating loosen soil.2. The rainfall-runoff test show that there are higher connection between rainfall intensity and runoff duration in blackland. The runoff duration reduce from 18.79min to 4.63min by the rainfall intensity increase from 40 mm/h to 120mm/h,the runoff duration will be shorter with increase the rainfall intensity.3. The results of contrast of infiltration model under rainfall show that Horton formula,Philip formula and Kostiakov formula are fit for simulating the infiltration process,and the simulate result...