地理学报 ›› 2019, Vol. 74 ›› Issue (9): 1890-1903.doi: 10.11821/dlxb201909014

• 土地利用与生态环境 • 上一篇    下一篇

内蒙古浑善达克沙地南缘 137Cs、 210Pbex复合示踪研究

胡云锋1,2,张云芝1,2   

  1. 1. 中国科学院地理科学与资源研究所 资源与环境信息系统国家重点实验室,北京 100101
    2. 中国科学院大学,北京 100049
  • 收稿日期:2018-07-03 修回日期:2019-07-01 出版日期:2019-09-25 发布日期:2019-09-25
  • 作者简介:胡云锋(1974-), 男, 江西赣州人, 博士, 副研究员, 主要从事生态环境评价、遥感监测与区域可持续发展评价研究。E-mail: huyf@lreis.ac.cn
  • 基金资助:
    中国科学院战略性先导科技专项(XDA19040301);中国科学院战略性先导科技专项(XDA20010202);国家重点研发项目(2016YFC0503701);国家重点研发项目(2016YFB0501502);高分辨率对地观测系统重大专项(00-Y30B14-9001-14/16)

Using 137Cs and 210Pbex to investigate the soil erosion and accumulation moduli on the southern margin of the Hunshandake Sandy Land in Inner Mongolia

HU Yunfeng1,2,ZHANG Yunzhi1,2   

  1. 1. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-07-03 Revised:2019-07-01 Published:2019-09-25 Online:2019-09-25
  • Supported by:
    Strategic Priority Research Program of CAS(XDA19040301);Strategic Priority Research Program of CAS(XDA20010202);National Key Research and Development Programm of China(2016YFC0503701);National Key Research and Development Programm of China(2016YFB0501502);Key Project of High-resolution Earth Observation(00-Y30B14-9001-14/16)

摘要:

土壤风蚀是导致土地退化、荒漠化以及大气扬尘、风沙天气的重要原因。内蒙古浑善达克沙地南缘是国家主体功能区规划确定的“两屏三带”的重要部分,科学估算本地区土壤风蚀强度及其变化,是地区生态安全和生态建设成效评估的重要内容。选择浑善达克沙地南缘的正蓝旗为研究区,运用 137Cs、 210Pbex复合示踪技术,对研究区土壤侵蚀速率及其变化进行了分析。结果表明:① 研究区内 137Cs本底值为2123.5±163.94 Bq·m -2, 210Pbex本底值为8112±1787.62 Bq·m -2。② 基于 137Cs同位素示踪分析,研究区侵蚀模数为-483.99~740.31 t·km -2·a -1;基于 210Pbex同位素示踪分析,研究区侵蚀模数为-441.53~797.98 t·km -2·a -1。③ 与20世纪20-70年代相比,20世纪70年代以来土壤侵蚀与堆积速率明显降低,研究区风沙活动明显减弱,区域生态环境质量得到改善。综合 137Cs和 210Pbex的多同位素复合示踪技术在干旱、半干旱地区土壤侵蚀研究中具有较大的潜力。

关键词: 风蚀, 示踪技术, 本底值, 定量估算, 沙地

Abstract:

Wind-driven soil erosion results in land degradation, desertification, atmospheric dust, and sandstorms. The Hunshandake Sandy Land, an important part of the Two Barriers and Three Belts project, plays important roles in preventing desert and sandy land expansion and in maintaining local sustainability. Hence, assessing soil erosion and soil accumulation moduli and analyzing the dynamic changes are valuable. In this paper, Zhenglan Banner, located on the southern margin of the Hunshandake Sandy Land, was selected as the study area. The soil erosion and accumulation moduli were estimated using the 137Cs and 210Pbex composite tracing technique, and the dynamics of soil erosion and soil accumulation were analyzed during two periods. The results are as follows: (1) the regional 137Cs reference inventory was 2123.5±163.94 Bq·m -2, and the regional 210Pbex reference inventory was 8112±1787.62 Bq·m -2. (2) Based on the 137Cs isotope tracing analysis, the erosion moduli ranged from -483.99 to 740.31 t·km -2·a -1. Based on the 210Pbex isotope tracing analysis, the erosion moduli was from -441.53 to 797.98 t·km -2·a -1. (3) Compared with the 1920-1970s, since the 1970s lower soil erosion moduli and accumulation moduli were observed. Therefore, the activities of local sand dunes weakened, and the quality of the local ecological environment improved. The multi-isotope composite tracing technique combining the tracers 137Cs and 210Pbex has potential for similar soil erosion studies in arid or semiarid regions around the world.

Key words: wind erosion, isotope tracing, reference inventory, quantitative estimation, sandy land