SoilErosionandSoilConservation.pptxVIP

Soil Erosion and Soil Conservation Contents Definition 1 The classification of soil erosion 2 3 4 Soil Conservation Hazards Soil erosion is the process that soil and its parent material is destructed、erosed、transported and deposed under the external influence of the hydro, wind, freezing and gravity . 1.Definition 2. The classification of soil erosion Hydraulic erosion type（水力侵蚀） . Due to atmospheric precipitation, especially the process and a series of soil erosion caused by rainfall erosion form called Hydraulic erosion。 （1）splash erosion（溅蚀） （2）Surface erosion（面蚀） Surface erosion refers to the surface runoff away due to the dispersion slope surface soil particles of a erosion phenomenon. （3）Gully erosion（沟蚀） Gully erosion is a confluence of surface runoff scour damage soil and parent material, cut into the ravine below the surface of the soil erosion forms. （4）Torrential flood erosion（山洪侵蚀） Torrential Flood erosion is the erosion of mountain river flood on gully embankment, the erosion or deposition process on the riverbed. 2.Gravitational erosion（重力侵蚀） Gravity Erosion is a form of soil erosion mainly due to the force of gravity. Gravitational erosion Tributary gullies 泻溜 Went steadily downhill 滑坡 Sinking in 陷穴 Avalanche 崩塌 陷穴 泻溜 崩塌 3.Glacier erosion(冰川侵蚀) The mechanical destruction caused by the action of the modern glacier is called the glacier erosion, which can be divided into two types: erosion and erosion. 5. Mixed erosion(混合侵蚀) Mixed erosion is under the joint action of the impact force of water flow and gravity in a special type of soil erosion, in production is often called mixed for debris flow erosion. 6. Wind erosion(风力侵蚀) It mainly includes air drought and wind, wind blown sand flow, sand dust storm and so on. 风力侵蚀 风沙流 沙尘暴 沙尘暴 Reduce the agricultural productivity and (natural landscape) ecological collapse, both because of the loss of nutrient rich upper soil layers. In some cases, the final result is desertification. Erosion removes the top