| The Beiluo river watershed, which lies in central south of the Loess Plateau, wasselected as study area. Utilizing TM (30m spatial resolution,1987,1995,2007) and MODIS(spatial resolution of250m,2000-2010) and DEM (30m) as the data base, and based onthe erosion process and mechanism, this paper analyzed vegetation coverage conditions, thecharacteristics of the temporal and spatial distribution and the variation trend on terraindistribution. Combination with sediment transport modulus, according to the "source" and"sink" landscape theory, analyze the influencing mechanism of vegetation cover patternchange and sediment transport process in the watershed. The main conclusions were asfollows:（1）The vegetation coverage of the Beiluo river watershed experienced the process ofslow to rapid increase trend from1987to2007, especially in Wuqi and Zhidan of thehilly-gully region, while the rocky-mountain region showed a stable increasing trend. Sinceconverting Farmland into Forest in1999, increasing trend of vegetation coverage in summerwas the most obvious, next was that in spring and autumn and steady in winter.（2）In recent20years, the vegetation coverage of slope>15°area in the hilly-gullyregion was obviously improved. The vegetation coverage was increased on the top of hillsand sunny hill slope land, which was the same in the table-gully region and rocky-mountainregion.（3）In recent20years, distribution of landscape pattern of the hilly-gully region androcky-mountain region became more reasonable. the LLI（slope and relative height）of thehilly-gully region were more than0, and the risk of soil erosion was still existed. Both ofthe two indexes of the rocky-mountain region in the same period were less than0, and therisk of soil erosion was very low. |
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