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基于核示踪的深圳市农用土壤侵蚀特征及评价

李俊杰 王仰麟 李定强 卓慕宁 吴健生

李俊杰, 王仰麟, 李定强, 卓慕宁, 吴健生. 基于核示踪的深圳市农用土壤侵蚀特征及评价[J]. 环境科学研究, 2013, 26(7): 780-786.
引用本文: 李俊杰, 王仰麟, 李定强, 卓慕宁, 吴健生. 基于核示踪的深圳市农用土壤侵蚀特征及评价[J]. 环境科学研究, 2013, 26(7): 780-786.
LI Jun-jie, WANG Yang-lin, LI Ding-qiang, ZHUO Mu-ning, WU Jian-sheng. Characterization and Evaluation of Agricultural Soil Erosion in Shenzhen City Using Environmental Radionuclides[J]. Research of Environmental Sciences, 2013, 26(7): 780-786.
Citation: LI Jun-jie, WANG Yang-lin, LI Ding-qiang, ZHUO Mu-ning, WU Jian-sheng. Characterization and Evaluation of Agricultural Soil Erosion in Shenzhen City Using Environmental Radionuclides[J]. Research of Environmental Sciences, 2013, 26(7): 780-786.

基于核示踪的深圳市农用土壤侵蚀特征及评价

基金项目: 国家自然科学基金项目(41001183,41271517,40635028)

Characterization and Evaluation of Agricultural Soil Erosion in Shenzhen City Using Environmental Radionuclides

  • 摘要: 运用137Cs和210Pbex联合示踪技术,考察深圳特区内外典型区域137Cs和210Pbex面积活度的背景值与变化特征,以及典型区农用土壤侵蚀速率、分布特征和主要影响因素. 结果表明:①在城市化剧烈的人为扰动作用下,深圳市的地表土壤环境已经大部分不具备自然土壤的基本属性. 深圳市137Cs面积活度背景值介于99~653Bq/m2之间,仙湖植物园的137Cs实测面积活度背景值最大〔为(653±81)Bq/m2〕,南澳新大村的137Cs实测面积活度背景值最小〔为(99±47)Bq/m2〕. ②随着海拔升高,210Pbex的实测面积活度背景值呈增加趋势,这和低纬度地区亚热带海洋性季风气候的水汽运动有关. ③深圳市南澳新大村和公明水库陡坡农用地种果造成的土壤侵蚀已达到了极剧烈的程度,土壤平均侵蚀速率分别高达6150和40530t/(km2·a). 深圳市农用土壤侵蚀具有分布面积广、人为扰动较剧烈、产流产沙集中、侵蚀强度较大等特征. 人为扰动主导的土地开发与陡坡种果是造成城市水土流失的主要影响因素. ④深圳市近30年来快速城市化活动加速了城市土壤侵蚀的发生和发展,亟待加强开发建设项目水土保持、陡坡还林还草等生态治理工作.

     

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出版历程
  • 收稿日期:  2012-11-21
  • 修回日期:  2013-04-10
  • 刊出日期:  2013-07-25

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