摘要
景观格局与生态过程的关系一直都是地球科学研究中关注的重点,地表水中稀土元素的迁移是一种连贯的地球化学行为,也可能受到景观格局的影响。本研究基于景观视角,对广州及周边5个区域的地表水进行采样,结合土地利用数据与数字高程数据,分析各采样区地表水中稀土元素浓度分布特征,并以各采样点为中心进行不同空间尺度的缓冲区分析,计算各缓冲区内的景观格局指数,通过Spearman相关性分析与冗余分析(RDA)定量研究地表水中稀土元素浓度与地形因子以及景观格局指数的关系。结果表明:①地表水中稀土元素的空间分异程度与高程存在显著正相关关系,海拔越高,地表水中稀土元素浓度越高,而与坡度、坡向无明显相关关系。②地表水中稀土元素浓度与景观格局指数存在显著相关关系,景观异质性程度越高,地表水中稀土元素浓度越低,反之景观连接度越好,地表水中稀土元素浓度越高。③不同空间尺度下景观格局对地表水中稀土元素浓度的影响具有明显差异,多数景观格局指数与地表水中稀土元素浓度的相关性在缓冲区空间尺度达到4000 m以上时才最显著,且在4000 m缓冲区中景观格局指数对地表水中稀土元素浓度的解释度最高。若通过景观规划对区域地表水中稀土元素浓度进行有效管控,景观格局调控的空间尺度应该在4000 m以上才会取得显著的效果。
The relationship between landscape patterns and ecological processes has always been the focus of geoscience research,and as a coherent geochemical behavior,the migration of rare earth elements(REE)in surface water may be influenced by landscape patterns.In this study,58 surface water samples were collected in five areas surrounding Guangzhou.We took 58 surface water sampling points to build four buffer zones,and calculated the landscape pattern index of each buffer zone.Combined land use data and DEM data,we analyzed the distribution characteristics of REE in surface water of the study area,and analyzed the relationship between REE content in surface water and topographic factors and landscape pattern index by Spearman correlation analysis and redundancy analysis(RDA).The results indicated that(1)there is a significant positive correlation between the spatial differentiation of REE content in surface waters and elevation.The content of REE in surface water tends to increase with the elevation,while there is no obvious correlation with slope and slope direction.(2)There is a significant correlation between the content of REE in surface water and landscape pattern index.The content of REE in surface water decreases with the increase of landscape heterogeneity.In contrast,the content of REE in surface water increases with the increase of landscape connectivity.(3)The influence of landscape pattern on REE content in surface water at different spatial scales varies significantly.The correlation between landscape pattern index and the content of REE in surface water is most significant when the buffer zone is more than 4000 m,and the landscape patterns of buffer zone at 4000 m has the strongest explanatory ability for REE content.Therefore,in order to effectively control the content of REE in regional surface water through landscape planning,the spatial scale of landscape pattern regulation should be above 4000 m to achieve significant effect.
作者
黄爱琳
尹小玲
王园园
朱建喜
邓丽明
林田
HUANG Ailin;YIN Xiaoling;WANG Yuanyuan;ZHU Jianxi;DENG Liming;LIN Tian(Guangdong Open Laboratory of Geospatial Information Technology and Application/Guangdong Provincial Key Laboratory of Remote Sensing and Geographical Information System,Guangzhou Institute of Geography,Guangdong Academy of Sciences,Guangzhou 510070,Guangdong,China;College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 201306,China;Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《地球化学》
CAS
CSCD
北大核心
2024年第1期53-63,共11页
Geochimica
基金
广东省基础与应用基础研究重大项目(2019B030302013)
广东省科技计划项目(2020B1212060055)
广东省基础与应用基础研究基金项目(2020A1515011068)
广东省科学院战略性先导科技专项(2020GDASYL-20200301003)联合资助。
关键词
地表水
稀土元素
地形
景观格局
空间异质性
surface water
rare earth elements
terrain
landscape pattern
spatial heterogeneity
