Studies On The Water And Soil Erosion Of Mountain Areas With Different Hedgerows In The South Of China

In this paper, the main areas for the South Mountain hills sloping land study soil characteristics, mainly the use of artificial simulation of rainfall and run-off area means the combined analysis of slope rill erosion of arable land have the time, the soil moisture content, total sediment and erosion Sediment volume changes over time, but also the use of rare-earth tracer method to study the slope of the main sources of sediment and erosion of slope sediment produced in the valley of the re-distribution and sedimentary characteristics. The results show that:1. By rill erosion occurred, the control group occurred later than the time to deal with day lily hedgerow occurred. Description of tillage on the soil surface to retard rill erosion occurred at a time. Timely tillage can play a role in soil and water, reduce the role of soil erosion.2. Hemerocallis hedgerow treatment and control group differences in soil moisture content is not critical, that deal can not change the hedgerow rill erosion of the soil at the time of the critical water content; However, the day lily hedgerow treatment and control group were processed show such a trend, that is, from the slope to the slope of the critical soil water content are seeing a gradual increase. The reasons for this trend need further study. Control group, the difference between the soil moisture content is not very significant, in parallel to achieve the desired control objectives. 0 ~ 5 cm of surface soil moisture, day lily to deal with gaps in the runoff plots with significant differences between the control group shows that the hedgerow can significantly improve the surface soil moisture content. Timely tillage, the control group occurred late in the day lily time to deal with the occurrence of hedgerow time; from slope to slope the surface of 0 ~ 5 cm of soil water content, there have been critical of the increasing trend. Soil moisture is an important indicator. Study on slope erosion rate of its size, the amount of erosion, erosion occurred at a time with the role of the evaluation of soil and water conservation measures is of great significance.3. In the rain, and precipitation changes in the scope of water pressure, the first artificial rainfall generated the largest volume of sediment erosion, and then with the increase in the frequency of rainfall, the total erosion generally declining trend. This with the previous rainfall conditions in the natural results of the experiment is different from their predecessors under the conditions of natural rainfall, erosion began small, with the continuing rain, increasing erosion, in this study under conditions of artificial rainfall. The beginning of rainfall greater soil erosion, but with the continued rainfall, erosion gradually decreased. However, in runoff plots B, C erosion have shown an increasing trend.4. Runoff plots B and C runoff plots the same site of rare earth erosion strip comparative analysis, three bands of rare earth is characterized by the common, the first artificial rainfall, the erosion strip between the different, and in the second rainfall to the fifth meeting, the article with little difference between the erosion.5. REE concentrations of the three showed similar changes in the law, in the valley, the slope of the sediment deposition does not change with distance of a line into a simple linear change. At different distances on different amount of deposition. From Huang and other research to know: the slope of soil nutrients mainly through the <0.02mm soil particles (including single-and water-stable aggregates) and the loss of loss of control of <0.02mm loss of soil particles that can significantly reduce the total amount of nutrient loss. If the slope of the erosion of sediment rich in nitrogen, phosphorus, potassium and other nutrients, is likely to cause eutrophication of water bodies. In serious soil erosion of sloping land areas, traditional agricultural cultivation, can cause serious soil erosion, rapid loss of sediment into the river or valley, sand with the constant migration of water bodies. And at the right body of water formed under the deposition conditions.