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中国沙漠 ›› 2007, Vol. 27 ›› Issue (6): 932-935.

• 沙漠与沙漠化 • 上一篇    下一篇

海南岛滨海沙地风沙活动的137Cs示踪初步研究

张素红; 严 平; 李 森   

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-11-20 发布日期:2007-11-20

Primary Research on Coastal Sandy Land in Hainan Island by 137Cs Technique

ZHANG Su-hong; YAN Ping; LI Sen

  

  • Received:1900-01-01 Revised:1900-01-01 Online:2007-11-20 Published:2007-11-20

摘要: 采用137Cs示踪法研究了海南岛滨海地区风沙活动特征,初步查明:由于137Cs沉积量有限,海南岛137Cs背景值含量较低,距海越近沙地中137Cs含量越低,在植被覆盖较好的草地与林地土壤中137Cs含量稍高;根据灌丛沙丘及丘间地剖面的137Cs分布态势,丘间地剖面137Cs含量趋于微量的均匀化,表现出长期稳定沉积特征,而灌丛沙丘具有人为扰动剖面的特征;海南岛西部沙地风沙沉积速率约为1.25 cm·a-1

关键词: 137Cs法, 滨海沙地, 海南岛

Abstract: Abstract: 137Cs technique has received wide application in soil erosion in recent years. In this paper, it is used to analyze the characters of sand movement in coastal sandy land in Hainan Island. The 137Cs reference inventory of Hainan Island is calculated to be (645.42±54.66)Bq·m-2, which is lower than the globe average of the Northern Hemisphere. And the 137Cs activity of coastal sandy land is also low because of the disturbance of water erosion, wind erosion and human activities. Analyzing results of the 137Cs distribution along soil profiles suggest that the interdune of shrub-coppice dunes experienced a long term of steady deposition, and the profile of shrub-coppice dune appears that it has disturbed by human activities. It is estimated that the deposit speed of sandy land in the west of Hainan Island is around 1.25 cm·a-1.

Key words: 137Cs technique, coastal sandy land, Hainan Island