The Soil Erion Investigation On "3S" Technology In Soil And Water Conversation Ecological Rehabilitation Region

This article takes soil and water conversation ecological rehabilitation region in zichuan area in the city of zibo as the research background,Region Manager as the technical platform,TM and the SPOT fusion image as the remote sensing information source,investigates the soil erosion condition in the project region,and gains the land utilization situation,the slope and the soil erosion intensity data of the project region through extracting information, processing data,drawing land parcel,investigating and confirming the situation of open country,creating the data base,withdrawing the slope from the DEM chart and so on.The main conclusions are as follow:(1) The proportion of the area of the forest land(including economic forest) and the lawn in center degree of coverage in the project region increases remarkable,from original 36.18%and 4.69%to 47.48%and 7.46%, separately growing 11.3%and 2.76%.The area of water and the inhabited area nearly changes,and the lawn area in low degree of coverage reduces remarkable,from original 17.47%to 9.66%,reducing 7.81%.Except the prohibited wild grassy slope,the majorities are used to develop the economic forest and replant the forest of water and soil conservation.(2) According to proclaimed graduation standard,the area of＜5°,5～8°,8～15°,15～25°,25～35°and＞35°is respectively 24.69 km~2,27.05 km~2, 70.21 km~2,97.62km~2,33.32km~2 and 25.13km~2,separately accounting for 8.88%,9.73%,25.25%,35.11%,11.98%and 9.04%in the total area.In the project region the slope is mainly 8-25°,accounting for 60.36%in the total area.(3) In the project region after ecological rehabilitation the land parcel area of vegetation coverage of＞70%,60%-70%,45%-60%,30-45% increases separately from original 12.77%,8.17%,8.93%and 11.0%to 21.48%,8.69%,10.87%and 13.89%.Of which the growth of the vegetation coverage of＞70%is the largest and grows 8.71%.The area of vegetation coverage of＜30%and farmland reduces,and the area of coverage of＜30% reduces the largest,from 46.57%to 33.05%.(4) Soil erosion condition:①Soil erosion area:In the project region the main soil erosion types are the water power erosion and the wind power erosion,and the water power erosion is primarily.After taking various ecological rehabilitation measures, the soil erosion area in the project region reduces from 209.18km~2 to 158.82km~2,reducing 50.36km~2.②Soil erosion intensity:After taking various ecological rehabilitation measures,the area of extremely intensity,intensity,moderate and mild soil erosion in the project region reduces,and the area of micro soil erosion increases.Mild soil erosion reduces obviously,from original 27.78%to 19.49%,reducing 7.79%.The micro soil erosion area increases,from 24.76% to 72.87%,increasing 18.11%.