许昊, 郭振, 张志卫, 王珏, 刘寅楚. 有居民海岛土壤重金属空间异质性及其入海风险分析:以田横岛为例[J]. 海洋环境科学, 2023, 42(5): 704-712. DOI: 10.12111/j.mes.2022-x-0254
引用本文: 许昊, 郭振, 张志卫, 王珏, 刘寅楚. 有居民海岛土壤重金属空间异质性及其入海风险分析:以田横岛为例[J]. 海洋环境科学, 2023, 42(5): 704-712. DOI: 10.12111/j.mes.2022-x-0254
XU Hao, GUO Zhen, ZHANG Zhiwei, WANG Jue, LIU Yinchu. Spatial heterogeneity and risk assessment of heavy metals in the soils of inhabited islands: A case study of Tianheng Island[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2023, 42(5): 704-712. DOI: 10.12111/j.mes.2022-x-0254
Citation: XU Hao, GUO Zhen, ZHANG Zhiwei, WANG Jue, LIU Yinchu. Spatial heterogeneity and risk assessment of heavy metals in the soils of inhabited islands: A case study of Tianheng Island[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2023, 42(5): 704-712. DOI: 10.12111/j.mes.2022-x-0254

有居民海岛土壤重金属空间异质性及其入海风险分析:以田横岛为例

Spatial heterogeneity and risk assessment of heavy metals in the soils of inhabited islands: A case study of Tianheng Island

  • 摘要: 查清海岛土壤环境本底特征,尤其是土壤重金属的空间异质性及其对周边海域的潜在影响,对于海岛生态承载力及脆弱性评估具有重要意义。以有居民海岛山东田横岛为研究对象,对岛内Cu、Ni、Cr、Pb、Zn 5种重金属含量开展取样与分析,利用反距离权重法研究重金属含量空间异质性特征;选取坡度、坡向两个地形要素,利用地理探测器研究其对重金属含量空间分布的影响;通过汇水区分析预测降水径流对周边海域污染的潜在风险源。研究表明:田横岛上重金属含量均未超过山东省背景值,且符合中国耕地标准,仅Zn存在轻度超标;基于相关性分析,土地利用与重金属含量无显著相关性,不同植被分布与重金属含量有显著相关性(p<0.01);地理探测器分析结果显示,坡度、坡向对重金属含量空间分布影响较小,两者的共同作用对重金属空间分布具有非线性增强贡献;基于汇水区分析,岛内部分汇水区重金属含量较高,岛陆上重金属通过暴雨径流将会产生海洋污染风险,有潜在影响周边海产养殖产业的风险,后续可将出水口与水动力分析相结合,开展陆源污染物入海的动态评估治理。以上研究结果对于进一步摸清有居民海岛土壤本底重金属含量空间分布特征,以及面向陆海统筹的田横岛新一轮开发建设具有重要研究意义。

     

    Abstract: It is of great significance to identify the background characteristics of soil environment in the island, especially the spatial heterogeneity of heavy metals in the soils and its potential impact on the adjacent sea areas, which is a prerequisite for the assessment of the island's ecological carrying capacity and vulnerability. In this study, Tianheng Island, an inhabited island of Shandong province, was chosen as a research object. Concentrations of five heavy metals, Cu, Ni, Cr, Pb, and Zn in the soils sampled from the island were analyzed, and the spatial heterogeneity characteristics of the five heavy metal contents were studied by using the inverse distance weighting method. Two topographical elements, slope gradient and aspect, were used to study their influence on the spatial distribution of the heavy metal contents by using geographic detectors. The potential risk sources of precipitation runoff pollution to adjacent sea areas were predicted through catchment area analysis. The result shows that the heavy metal contents on Tianheng Island did not exceed the background value of Shandong Province, in line with the Chinese cultivated land standard, except Zn slightly polluted. Based on the correlation analysis, there is no significant correlation between land use and heavy metal content, but there is a significant correlation between different vegetation distribution and heavy metal content (p<0.01). The results of geographical detector analysis showed that slope and aspect had little effect on the spatial distribution of heavy metals, and their combined effect had a nonlinear enhancement contribution to the spatial distribution of the heavy metals. Based on the analysis of the catchment area, there are many water outlets flowing into the ocean, and some catchment areas contain more heavy metals. Heavy metals on the island might cause marine pollution risks through stormy runoff, which might affect the marine aquaculture industry. It is suggested that, to the point precisely, the outlet can be combined with the hydrodynamic force for the precise governance. The research results are of important theoretical significance for improving our understanding the spatial distribution characteristics of background contents of heavy metals in the soils of inhabited islands, and for a new round of development and construction of Tianheng Island based on land and sea oriented overall planning.

     

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