Chen Zhi-fan, Zhao Ye, Qiao Jie-juan, Zhang Qing, Zhu Yu-en, Xu Cui-hua
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China.
Appl Radiat Isot. 2009 Oct;67(10):1785-9. doi: 10.1016/j.apradiso.2009.06.006. Epub 2009 Jun 21.
The Luanhe River Source Area belongs to typical semi-arid, agro-pastoral ecotone of North China. It is very important for the prevention and treatment of soil erosion in North China to analyze and evaluate quantitatively the recent 30-year changes in the process of soil wind erosion in this area. Based on long field observations, soil samples from different depths in a representative wind-deposited soil profile in the Luanhe River Source Area were collected. Then the (137)Cs activity of soil samples from different depths in the soil profile was determined using a GEM series HPGe (high-purity germanium) coaxial detector system (ADCAM-100), and their soil properties, such as the soil particle fraction and so on, were analyzed. According to the detected (137)Cs activity of different depths, a continuous time sequence of the wind-deposited soil profile in the study area was established. Furthermore, through assumption on a soil relative wind erosion intensity index (SWEI), recent 30-year changes in the process of soil wind erosion in the Luanhe River Source Area were retrospected . The analysis results revealed that weaker soil wind erosion occurred in the study area from the 1970s to the early 1980s and from the late 1980s to the mid to late 1990s. Conversely, intense periods of soil wind erosion occurred in the mid-1980s and from the late 1990s to 2002.
滦河源区属于华北典型的半干旱农牧交错带。定量分析和评估该区域近30年土壤风蚀过程的变化，对于华北地区水土流失的防治具有重要意义。基于长期的野外观测，在滦河源区采集了具有代表性的风积土壤剖面不同深度的土壤样本。然后，使用GEM系列HPGe（高纯锗）同轴探测器系统（ADCAM - 100）测定土壤剖面不同深度土壤样本的（137）Cs活度，并分析其土壤颗粒组成等土壤性质。根据不同深度检测到的（137）Cs活度，建立了研究区风积土壤剖面的连续时间序列。此外，通过假设土壤相对风蚀强度指数（SWEI），回顾了滦河源区近30年土壤风蚀过程的变化。分析结果表明，研究区在20世纪70年代至80年代初以及80年代末至90年代中后期土壤风蚀较弱。相反，在80年代中期以及90年代末至2002年期间土壤风蚀强烈。
