Effect On Patterns And Mechanism Of Corrosion Proof From Water Erosion In Different Tillable Mode

Wind erosion and water erosion is the most important disasters in farmland of loess plateau, on the one hand, there are much moisture and nutrient lost because of wind erosion and water erosion, and cause the soil dry ,then form drought. On the other hand , though the lost of nutrient is not as severe as hail and frost, is a kind of disaster of largo. So ,the disease which caused from the wind erosion and water erosion is the most important disasters in farmland of loess plateau. The study studied the type, the factors and the mechanism of disaster by system analysis, set six tillage: CK,No-till(NT), Straw mulching(SM), plastic film mulching(PM),Ridging and plastic film mulching(RPM),Interplant in shenmu. To use the methods of Positioning monitoring and Statistics, studied the temperature, moisture and nutrients of different tillage, revealed the corrosion proof mechanism and the effect on controllable patterns. And chose ten evaluation indexes to study the Impact evaluation on different tillage . This study provide five conservation tillage, and the credible background of using reasonable tillage in the Wind-Water Erosion Crisscross Region. in order to realizing the sustainable development of the agriculture in this area.1) All of the conservation tillage can keep the suitable soil temperature at the stages of extremes. The relativity of temperature between air and soil in SM is the lowest, so can effectively protect the crop. The RPM is the highest and the SM is the lowest of average temperature .2) Compare with the CK, All of the conservation tillage can effectively decrease the soil bulk density ,increase the capillary porosity, noncapillary porosity and bulk porosity. And increase the water storage of saturated soil, Suck hold water storage and Stranded water storage. In the sloping farmland, the roughness of lengthways always bigger than roughness of crosswise, and effectively except CK and In. The roughness of crosswise of SM is the maximum, can effectively obstruct the transverse flow of runoff. The mean roughness and the roughness of lengthways of SM and RPM is the maximum,show the major effect of obstruct the runoff.3) SM, NT and PM can significantly increased soil moisture in the surface layer, and NT is low and SM is high in the deeper layer, SM can effectively increase the soil moisture in the deeper layer .The RPM can effectively increase the soil moisture in the surface layer at the stage of flowering of soybean and the stage of booting of millet to content the need of crop. SM and PM can effectively decrease the lost of moisture after the rain, and the effect of NT is more obvious.4) SM significantly can increase Soil organic matter in the surface, all of the treatments can increase the content of total K, and affect the content of P and K teeny,Intercropping can increase the content of Available K . The correlation of Water and soil nutrition is not strong, and is different between different tillage. However, tillage effects on local plants have a certain universality. Based on soil moisture and nutrients keeping, SM is batter than other tillage.5) Select the reasonable evaluation indexes ,Get the contestant data by using the methods of Positioning monitoring and Statistics. BP neural network model and network training is applied in evaluation index generated by sequence of random technology and evaluation of their own level of value. After the network training, different evaluation are input. By calculating, we can get the evaluation of grade value of different tillage .Studied the impact evaluation of conventional tillage of millet , and five conservation tillage on Sloping Farmland in the Wind-Water Erosion Crisscross Region.The result shows that:Ridging and plastic film mulching>Straw mulching(SM)> plastic film mulching(PM) >CK >No-till(NT)>Interplant.Conservation tillage are better than conventional tillage.Provide some effective tillage to the Wind-Water Erosion Crisscross Region ,and Provide the credible background of using different tillage, in order to realizing the sustainable development of the agricuture in this area.