| This research utilizes the 3S technology, take the Huoshan County in Anhui Province as the study geographic area, take the TM(MSS) remote sensing phantom (including four periods about 1979, 1994, 2002 and 2006) as the main data sources. Taking a dynamic study about the soil erosion phenomenon in Huoshan County. Comparative analysis soil erosion and the evolutionary trend during different years in study area. Combined with the historical data and field survey, and integrated use the theory and methods of soil and water conservation, summing up years of experience in soil and water conservation, searching for ecological improvement factors in regional, compared to select a more suitable control measures of the soil erosion. It is order that provide useful information for more effective utilization of soil erosion, and provide references for control the soil erosion of demonstrated promote regions. Through the research, the main conclusions are as follows:1. Through interpreting the four phrases'remote sensing images and field investigation in Huoshan County, to obtain the county's main current characteristics of soil erosion. At present, the total soil-erosion areas of the county is 804.28km~2, accounting for 39.40% of the total area of the county. Study area is slight erosion of the overall strength of the main erosion area of 681.96km~2, accounting for 33.40% of the total area of the county. Some area dominated by moderate erosion types.2. The areas of soil erosion showed a decreasing trend in all County. Soil erosion intensity decreased obvious. Areas of soil erosion reduced from 1276.52km~2 to 804.28km~2 during 1979 to 2006, reduced 472.24 km~2 during 20 years, which is accounting for 23.13% the total area of the County. It indicated, the comprehensive management of soil erosion obtained remarkable results during 20 years in Huoshan County, and curbed the occurrence of soil erosion and development effectively. It improved significantly the ecological environment in the County.3. The variation ruler of soil erosion in different periods is slight erosion mainly. Spatial variation in different levels of soil erosion intensity is significantly. Four typical periods of 1979,1994,2002 and 2006 showed the main types of soil erosion are mild, moderate and strength-erosion of soil erosion areas accounting for 97.83%, 96.55%, 95.26% and 84.20% of the total area respectively.4. The variation ruler of soil erosion intensity in different periods is gradually reduced. It shows the higher intensity level erosion transform to the lower. Spatial variation in different levels of soil erosion intensity is significantly. However, the variation of the soil erosion intensity between area and spatial indicated is difference in different periods. The soil erosion areas'variation order in different of the periods is 2002~2006(13.03km~2)<1979~1994(316.96km~2) <1994~2002 (802.23km~2). It indicated that significant effects of soil erosion control, soil conservation work has proceeded smoothly in the period from 1994 to 2002 in Huoshan County.5.Slight and moderate erosion is an integral part in Huoshan County, intense erosion followed. On the whole, it is no strong features erosion. At the same time, the distribution with different levels of soil erosion intensity has obvious spatial difference among them. The intense and extremely high erosions are distributed mainly in the regions where the activities of human production with the low-frequency coverage of vegetation or steep. Moderate erosion occurs mainly in rocky areas with the medium coverage of vegetation regions. Slight erosion mainly affected on the high coverage of vegetation areas by human activities in less effect, and reservoirs, channel on both sides of cultivated land, garden plot and the gentle slope area. It shows human activities and their methods with ground vegetation, slope and other conditions change is an important factor for affecting the soil erosion of region. |
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