基于GIS和RS的抚顺市土壤侵蚀动态研究

以GIS为平台,利用遥感数据和修正的通用土壤侵蚀方程(RUSLE)动态研究了浑河上游抚顺地区的土壤侵蚀.结果表明,抚顺市1998年和2005年两个时期的侵蚀强度跨越了微度到强度的四个等级,侵蚀面积约占总面积的49.11%(1998年)和47.44%(2005年),年平均侵蚀量分别为242.96 t/(km2.a)(1998年)和263.31 t/(km2.a)(2005年),以微度侵蚀、轻度侵蚀和中度侵蚀为主,伴有少量的强度侵蚀.受人为活动和降水变化的影响,2005年比1998年侵蚀面积相对减小,但侵蚀强度加大.从土壤侵蚀与坡度、海拔和土地利用的关系来看,研究区的土壤侵蚀主要出现在坡度为8°~...

Dynamic Study on Soil Erosion in Fushun City Based on GIS and RS

The soil erosion in two years of the Fushun city was studied dynamically with RS data and empirical RUSLE on GIS platform. The results indicated that the soil erosion intensity of the whole city area in 1998 and 2005 included four levels from tiny to heavy erosion, and the area of eroded soil was about 49.11% and about 47.44% of the total area surveyed in 1998 and 2005, respectively, i.e., the annual mean eroded area was 242.96 t/(km²·a) and 263.31 t/(km²·a). The soil erosion was mainly at tiny, light and medium levels with a bit at heavy level. The eroded area decreased from 1998 to 2005 due to human activities and changing precipitation, but the erosion intensity became heavier. In view of the relation of soil erosion to slope, altitude and land utilization, the eroded area was mainly distributed on the 8°-15° slopes, and the land whose elevation is 200-1000 m. However, the forest area covered all the four levels from tiny to heavy erosion, which occupied about 53% and about 72.5% of the total eroded area in 1998 and 2005, respectively.