地层岩性变化对土壤Zn空间异质性的影响——以贵州省为例  

Effect of Lithologic and Chronostratigraphic Changes on Spatial Heterogeneity of Soil Zinc: Case Study of GuiZhou Province

作　　者：杨鉴 刘方[1,2] 朱健[1,2] 陈祖拥[2] 刘元生 YANG Jian;LIU Fang;ZHU Jian;CHEN Zu-yong;LIU Yuan-sheng(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guiyang 550025,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025

出　　处：《长江流域资源与环境》2022年第8期1836-1844,共9页Resources and Environment in the Yangtze Basin

基　　金：国家自然科学基金委员会-贵州省人民政府喀斯特科学研究中心项目(U1612442);贵州省科技计划项目(黔科合平台人才[2017]5788号)。

摘　　要：为探究地层岩性变化对土壤锌(Zn)含量空间分布的影响,采用地统计分析与GIS相结合的方法对贵州省境内262个采样点土壤Zn含量进行空间插值,并与贵州省地质图、岩性组合类型分布矢量图进行空间叠加。结果表明:贵州省区域土壤Zn含量水平可划分为中低锌区(0~80 mg/kg)、丰锌区(80~200 mg/kg)、预警区(>200 mg/kg);贵州省土壤Zn空间块金系数达0.48,土壤Zn分布具有空间中等程度自相关性。土壤Zn预警区主要分布在石炭系和二叠系地层,土壤丰Zn区主要分布在三叠系和寒武系地层,而土壤中低Zn区主要分布在震旦系、奥陶系地层。此外,同一地层上碳酸盐岩对土壤Zn含量水平的影响程度大于碎屑岩,且碳酸盐岩占比越高的区域,土壤Zn的富集现象越明显。研究区域内土壤Zn含量的空间异质性与地层年代有明显的关联性,碳酸盐岩比例是制约土壤Zn富集的主导因子,地层年代及岩性组合变化是导致贵州省区域土壤Zn含量出现空间异质性的主要原因,土壤丰Zn区是发展富Zn农产品的重要区域。In order to explore the influence of lithologic and chronostratigraphic changes on the spatial distribution of soil zinc, the geostatistical analysis and GIS were used to carry out the spatial interpolation of soil Zn content for 262 sampling points in Guizhou Province;meanwhile, geological map and lithology map of Guizhou Province were used to overlay and analyze with soil Zn content by spatial interpolation. The result show that the conent of soil Zn could be divided into three zones in Guizhou province: low and middle zinc zone(0-80 mg/kg), rich zinc zone(80-200 mg/kg) and warning zone(>200 mg/kg). Moreover, the nugget coefficient of soil zinc in Guizhou province was 0.48, which indicates that the distribution of soil zinc has moderate spatial autocorrelation. Namely, the warning zone is mainly distributed in the Carboniferous and Permian strata, the rich zinc zone is mainly distributed in the Triassic and Cambrian strata, and the low and middle zinc zone is mainly distributed in the Sinian and Ordovician strata respectively. Also, in the same chronostratigraphic unit, the effects of carbonate rocks on soil Zn content level is greater than that of clasolite, which the areas with higher proportion of carbonate rocks exist more obvious phenomenon of soil Zn enrichment. As a result, the spatial heterogeneity of soil Zn content is obviously related to the chronostratigraphic unit, which the proportion of carbonate rock is the dominant factor restricting the enrichment of soil Zn, and changes of stratigraphic age and lithological combination in Guizhou Province are the main reasons for the spatial heterogeneity of Zn content in the soils. The rich zinc zone of soil is a key area for the development of Zn-rich agricultural products.

关 键 词：土壤Zn 空间分布 地质岩性 地层年代 

分 类 号：S153.6[农业科学—土壤学]