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在对海南省主要胡椒种植区-文昌、琼海两市种植地土壤重金属含量调查的基础上,采用单项污染指数法和综合污染指数法,结合绿色食品产地环境技术条件及土壤环境质量二级标准,对其重金属含量现状进行了评价;然后结合深层土壤、母质岩石样品及海南岛1:25万多目标区域地球化学调查成果,对其土壤重金属来源进行了综合分析。结果表明,相对所选标准,沉积砂岩区(F11~F13)、第四系松散沉积物区(F7、F14)和花岗岩区一种植地(F9)均符合绿色食品产地要求。玄武岩区(F1~F6)土壤Cu、Cr、Ni超标,花岗岩区另一种植地(F8)和变质岩区(F10)土壤Pb、As超标。综合分析结果显示,胡椒基地土壤环境质量整体良好,成土母质是土壤中重金属元素的主要控制因素,但部分种植地浅层土壤中Cd、Pb、As等重金属元素已受到人类活动的影响。
Based on the investigation of heavy metal contents in the soils planted in the main pepper growing areas of Hainan Province - Wenchang and Qionghai, the single pollution index method and the integrated pollution index method were used to analyze the environmental technical conditions and the secondary standard of soil environmental quality , And the heavy metal content of the soil was evaluated. Based on the geochemical survey results of deep soil, parent rock samples and 1: 250,000 target areas in Hainan Island, the sources of heavy metals in the soil were comprehensively analyzed. The results show that, compared with the selected criteria, the sedimentary sandstone areas (F11 ~ F13), Quaternary fluvial sediment area (F7, F14) and granite area (F9) all meet the green food production requirements. The contents of Cu, Cr and Ni in the basalt area (F1 ~ F6) exceeded the standard, and the contents of Pb and As in the other cultivated area (F8) and metamorphic rock area (F10) in the granite area exceeded the standard. The results of comprehensive analysis showed that soil environment quality of pepper base was good and that soil parent material was the main controlling factor of heavy metal elements in soils. However, Cd, Pb, As and other heavy metal elements in shallow soils of some planted soils had been affected by human activities.