研究报告

  • 曾婷,王鹏,陈世龙,吴波波,舒旺,徐启渝,黄益平,丁明军,张华.土地利用和地形特征对袁河溶解态金属元素的影响[J].环境科学学报,2022,42(2):438-449

  • 土地利用和地形特征对袁河溶解态金属元素的影响
  • Effects of land use and topographic features on dissolved metal elements in the Yuan River Basin
  • 基金项目:国家自然科学基金项目(No.41201033); 江西省重大生态安全问题监控协同创新中心项目(No.JXS-EW-00);江西师范大学研究生创新基金项目资助(No.YJS2020010)
  • 作者
  • 单位
  • 曾婷
  • 江西师范大学地理与环境学院,南昌 330022;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,南昌 330022
  • 王鹏
  • 江西师范大学地理与环境学院,南昌 330022;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,南昌 330022
  • 陈世龙
  • 江西省吉安市第一中学,吉安 343000
  • 吴波波
  • 江西师范大学地理与环境学院,南昌 330022;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,南昌 330022
  • 舒旺
  • 江西师范大学地理与环境学院,南昌 330022;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,南昌 330022
  • 徐启渝
  • 江西师范大学地理与环境学院,南昌 330022;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,南昌 330022
  • 黄益平
  • 江西师范大学地理与环境学院,南昌 330022;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,南昌 330022
  • 丁明军
  • 江西师范大学地理与环境学院,南昌 330022;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,南昌 330022
  • 张华
  • 江西师范大学地理与环境学院,南昌 330022;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,南昌 330022
  • 摘要:为研究土地利用和地形特征对袁河水体溶解态金属元素的影响,在2018年7月和2019年1月于袁河干流及支流设置38个采样点采集表层水样,测定金属元素Al、Fe、Cr、Mn、Cd、As、Tl和Ni的浓度.采用相关分析、偏最小二乘结构方程模型与方差分解等方法探讨缓冲区和子流域尺度土地利用和地形特征对金属元素的影响.结果表明:①土地利用和地形特征对袁河溶解态金属元素浓度均具有较大影响,且二者解释能力大小接近.土地利用中的建设用地和农田,以及地形特征中的高程积分是研究区内金属元素主要影响因素,与溶解态金属元素浓度呈正相关,按影响能力排序为,建设用地>高程积分>农田.②土地利用方式对溶解态金属元素浓度的解释能力在缓冲区尺度最高,地形特征对溶解态金属元素浓度的解释能力在子流域尺度和缓冲区尺度大小接近,二者交互作用对溶解态金属元素浓度的解释能力在缓冲区尺度最高.③土地利用方式在缓冲区尺度对溶解态金属元素浓度变化解释能力枯水期高于丰水期,地形特征在所有尺度对溶解态金属元素浓度变化解释能力枯水期高于丰水期,二者交互作用对溶解态金属元素浓度的影响枯水期高于丰水期.以上结果表明,土地利用方式和地形特征是驱动袁河金属元素变化的重要因素,根据地形特征加强相应最佳空间尺度上土地利用的管理对金属元素污染的控制具有重要意义.
  • Abstract:To study the effects of land use and topographic features on dissolved metal elements in the Yuan River water, surface water samples were collected at 38 sites in the main stream and tributaries of Yuan River in July 2018 and January 2019, and the concentrations of metal elements Al, Fe, Cr, Mn, Cd, As, Tl and Ni were measured. Correlation analysis, partial least squares structural equation model and variation partitioning were used to explore the effects of land use and topographic features on metal elements at the buffer zones and sub-basin scales. Results showed that ①Both the land use and topographic features had huge influences on metal element concentrations in the Yuan River and their explained variation was close. The land use of construction and farmland, and the topographic features of elevation integral were the main influencing factors of metal elements in the study area, and they were positively correlated with metal element concentrations, following the order: construction > elevation integral > farmland. ②For the explaination of metal element concentrations in different regions, land use patterns was more significant for the buffer zone, and topographic features was close at the sub-basin and the buffer zone, and the combination of land use patterns and topographic features was more significant for the buffer zone. ③The explained variation of metal element concentrations by land use patterns at the buffer scale was higher in the dry season than in the wet season, by topographic features was higher in the dry season than in the wet season, and by the interaction between land use patterns and topographic features was higher in the dry season than in the wet season. The above results indicate that land use pattern and topographic features are important factors driving the variation of metal elements in the Yuan River, and it is important to strengthen the management of land use at the corresponding optimal spatial scale according to topographic features for the control of metal element pollution.

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