Study On Soil Erosion And Soil Element Characteristics Of Dryland Terraced Fields In She Xian County

The dry farming terrace system in She Xian County is an ecological system in which the Five-in-One adheres to the concept of recycling and sustainable development.The natural characteristics of the area are lack of soil and water shortage,but the local working people have been building double-layered stone rafts on the outer terraces to protect the terraces.The stacked stones make the soil layer tighter due to the longitudinal pressure,which reduces soil erosion and soil nutrients.Loss.In this paper,spatial high-resolution remote sensing images were used to monitor and analyze the soil erosion intensity of the dry-field terraces in the county from 2000 to2017,and the physical and chemical properties of the soil in the core area of the terraces were measured and analyzed through field sampling and indoor sample analysis.Through analysis and research,the main conclusions include:?1?In order to analyze the soil and water conservation of the Dendrobium terraces in the northern soil and rocky mountainous area,the GIS and RS techniques were used to estimate the study area 2000-2005,2006-2011 using the Revised Universal Soil Loss Equation?RUSLE?.The spatial distribution characteristics of soil erosion in the study area were obtained in the three stages of the year and 2012-2017,and the soil and water conservation measures factor P of the terraces in the study area were corrected by in-situ observation experiments.The results show that the water and soil conservation capacity of the terraced area is much higher than other land use patterns in the study area.Explain that the terrace system has the function of reducing soil erosion,which can provide basic data and theoretical reference for the scientific management of soil erosion.?2?From the spatial analysis of the economic value of terraced and bare land loss in 2000-2017,it is known that the main function of dry farming terrace ecosystems reduces economic losses compared to bare land.Whether it is the value of water loss loss,the value of soil waste loss,the value of sediment retention loss,or the value of sediment loss,terraced areas are lower than bare land.The economic loss analysis caused by soil erosion in the study area from 2000 to 2017 shows that the value of soil waste loss is the largest,the average value of the terraced area is 1.5×10¹¹ yuan,and the average value of bare land is 1.32×10¹² yuan.Secondly,the economic losses caused by sedimentation and water loss,the economic loss of sediment retention is minimal.?3?To investigate the soil nutrient,soil water content and soil bulk density of terraced arable land and non-side sloping land in the core area of Dendrobium terraced land in the important national agricultural cultural heritage of County,Hebei Province?the soil observation depth is 0-20cm?.The results showed that the soil organic matter,soil total carbon and soil total nitrogen in the terraces were significantly higher than the non-graded slopes,and the soil available nutrients?ammonium,nitrate and available phosphorus?were significantly higher.Non-terraced slopes.The soil organic matter,soil total carbon,soil total nitrogen,ammonium nitrogen,nitrate nitrogen and available phosphorus content of the terraced fields increased by 26.32%,29.46%,24.28%,6.09%,2.77%,respectively,compared with the non-terraced soil nutrients 30.27%.It is worth noting that the soil moisture content of terraced fields is significantly higher than that of non-terraced soils?P<0.05?.In addition to available phosphorus,the soil available nutrients in terraced fields increased significantly with the increase of soil water content.That is,the soil water content of the terraced soil significantly increased the ammonium nitrogen?R²=19,P<0.05?and nitrate nitrogen?R²=19,P<0.05?.?4?The loss of soil nutrients will inevitably lead to a decline in soil quality.The quality of soil quality or the degree of good or bad is the key to affecting and restricting ecological environment restoration,land degradation control,soil and water conservation and sustainable agricultural development.Soil physical properties can not only affect soil aeration,water permeability,water storage,but also closely related to soil nutrients.Studies have shown that the soil moisture content of terraced fields is significantly higher than that of non-terraced soils?P<0.05?,and the soil moisture content of terraced and non-terraced fields is 0.221 and 0.209,respectively.Compared with non-terraced sloping land,it indicates that the year-round tillage of terraced arable land on the basis of fertilization can effectively increase soil water content.The pH of the terraces is also higher than that of the non-terraced fields,8.23 and 8.17,respectively,which may be related to the application of organic fertilizers in terraces for many years,because organic fertilizers have the function of improving soil acidification.Figure 7 also shows that the soil bulk density of non-terraced fields is higher than that of terraced soils,and the corresponding soil bulk density values are1.20 and 1.18,respectively.It can be seen that the tillage treatment of the terraced fields will loosen the soil layer and reduce the bulk density.