长江流域资源与环境 >> 2012, Vol. 21 >> Issue (11): 1376-.

• 生态环境 • 上一篇    下一篇

南京地区7Be沉降特征

杨本俊|杨浩|陈劲松|丁兆运|王小雷   

  1. (1.南京师范大学地理科学学院|江苏 南京 210046;2.皖西学院资源环境与旅游管理学院|安徽 六安 237012;3.南京晓庄学院生物化工与环境工程学院|江苏 南京 211171
  • 出版日期:2012-11-20

DEPOSITIONAL FLUXES OF 7BE AT NANJING REGION

YANG Benjun1,2, YANG Hao1, CHEN Jinsong1, DING Zhaoyun1, WANG Xiaolei1,3   

  1.  (1.School of Geography Science,Nanjing Normal University,Nanjing 210046,China|2.School of Resource Environment and Tourist Management,Western Anhui University,Lu’an 237012,China|3.College of Biochemical and Environmental Engineering,Nanjing Xiaozhuang University,Nanjing 211171,China
  • Online:2012-11-20

摘要:

7Be是研究大气科学与地球化学的核元素之一,对研究短期过程的地表土壤颗粒迁移具有较大价值。为了解南京地区利用7Be进行土壤侵蚀示踪研究的合适时机,于2010年1月~2011年12月收集南京地区各月的7Be沉降样品,经实验室化学实验处理和γ谱仪测量,计算7Be沉降通量,并分析7Be大气沉降的季节性变化趋势。结果表明:南京地区平均7Be沉降量为1 62178 Bq/(m2·a),沉降通量为066~1449 Bq/(m2·d),平均沉降通量为444 Bq/(m2·d);7Be沉降通量的季节变化呈现双峰型趋势,冬末春初和夏季是两个高值区;7Be沉降的а值冬春季较大,夏季最低;降雨量大小与沉降量存在明显的正相关

Abstract:

7Be which is one of the most investigated radionuclides in the atmosphere has wide applications in meteorology and geochemistry.It also has been a useful tracer for documenting soil erosion rates over much shorter timescales.In order to find the suitable time of soil erosion by using 7Be tracer in Nanjing region,monthly atmospheric deposition samples of 7Be were collected from January 2010 to December 2011.Deposition samples were experimented to obtain residual samples which was followed by measurement with a HPGe detector for 7Be.Deposition fluxes and seasonal variation pattern of atmospheric deposition of 7Be were analyzed.The results showed that the depositional fluxes of 7Be ranged from 066 to 1449 Bq/(m2·d) and a mean value was 444 Bq/(m2·d),annual average depositional fluxes were 1 62178 Bq/m2.The seasonal variation of depositional fluxes of 7Be showed double peaks,higher flux value was in late winter and early spring,another higher flux value was in summer.The fractor of precipitationnormalized depositional fluxes of 7Be were higher value in winter and spring,but the minimum value was in summer.Furthermore,a positive correlation between the 7Be fluxes and precipitation was observed in this study

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