关键词: 伊维菌素, 雄性鲫, 生殖, 毒性

Abstract: By using Landsat TM images and topographic maps as the data sources, and with the supports of GIS and RS techniques, the data of soil erosion intensity in hilly area of central-south Shandong Province in 1986, 1995, and 2004 were collected, and the recent 20 years dynamic changes of the landscape pattern of soil erosion intensity in this area were analyzed. In the study area, the areas with minute and slight soil erosion increased, while those with moderate to severe soil erosion had an obvious decreasing trend, in which, slight, intense, very intense, and severe soil erosion areas had significant changes. The transfer rate of lower level (minimal, slight, and moderate) soil erosion intensity was relatively low, but the higher level (intense, very intense, and severe) soil erosion intensity transferred greatly. At landscape level, the patch number and landscape shape index from 1986 to 1995 increased while the contagion index decreased, which indicated that in this period, the patch fragmentation was increased but the connection degree was decreased, and the shape became more complex. From 1995 to 2004, an opposite trend was observed.

Key words: ivermectin, male Crucian carp, reproduction, toxicity.