关键词: 长安, 土壤侵蚀, 识别标志, 侵蚀厚度, 侵蚀规律

Abstract: On the basis of author s observation and survey, soil erosion characters and erosive regularity were studied for Shaoling tableland of Chang an County. The results show that the identifying sign of soil erosion is not erosive surface but the degree of soil s conservation and the change of soil s thickness. Soil erosion is weaker in high and flat area than that in low area and swale, this new regularity differs from the past. From tableland side to tableland inside, soil erosion weakens generally, but also has the show of erosion enhancing in tableland inside, and this change was caused by the undulation of landform. Soil erosion was also effected by climate, whether in cool-dry or in warm-wet period of Holocene soil erosion all existed, but the thickness of erosion was bigger obviously in cool-dry period than that in warm-wet period. Holocene loess deposition(L_o) began since 3100 a BP, when the soil erosion transferred from weak to strong.

Key words: Chang'an County, soil erosion, identified sign, erosive thickness, erosive regularity