ABSTRACT Soil loss, erosion vulnerability and source contribution of sediments from the severely logged rainforest region of the Baram River basin, Borneo, were characterized for three periods over the past 25 years: 1991–1994 (T1), 2006–2007 (T2) and 2015 (T3). A geographical information system (GIS) was used to estimate the Revised Universal Soil Loss Equation (RUSLE) and sediment source determination. Maximum annual soil loss varied from 483 and 671 t ha−1 year−1 in T1 and T2, respectively, to 1312 t ha−1 year−1 in T3. Soil erosion vulnerability shows a significant increasing trend between T1 and T2, subsiding by T3, as reflected in the percentage area of high erosion vulnerability zones (T1 < T2 > T3). Development of logging roads in the region increased significantly during the period and was identified as the source contributor of sediments. Zones of high soil loss are more closely controlled by barren land, logging roads and shifting agricultural practices than by any other type of land use, and this indicates the need for better restoration methods to reduce overall soil loss.

中文翻译：

---

婆罗洲热带雨林地区土壤侵蚀时空特征及沉积物来源贡献者识别

摘要 婆罗洲巴拉姆河流域严重砍伐雨林地区的土壤流失、侵蚀脆弱性和沉积物来源贡献在过去 25 年的三个时期进行了表征：1991-1994 (T1)、2006-2007 (T2) 和2015 (T3)。地理信息系统 (GIS) 用于估计修订后的通用土壤流失方程 (RUSLE) 和沉积物来源确定。最大年土壤流失量从 T1 和 T2 的 483 t ha−1 year−1 分别到 T3 的 1312 t ha−1 year−1 不等。土壤侵蚀脆弱性在 T1 和 T2 之间显示出显着增加的趋势，然后由 T3 消退，反映在高侵蚀脆弱区的百分比面积 (T1 < T2 > T3) 中。在此期间，该地区伐木道路的开发显着增加，并被确定为沉积物的来源。与任何其他类型的土地利用相比，贫瘠的土地、伐木道路和不断变化的农业实践对土壤流失率高的地区的控制更严密，这表明需要更好的恢复方法来减少总体土壤流失。