Rheeder J P, Marasas W F, Farina M P, Thompson G R, Nelson P E
Programme on Mycotoxins and Experimental Carcinogenesis (PROMEC), Medical Research Council, Tygerberg, South Africa.
Eur J Cancer Prev. 1994 Jan;3(1):49-56. doi: 10.1097/00008469-199401000-00007.
Soil samples were collected during certain years for the period 1982-89 from high- and low-risk areas for oesophageal cancer in Transkei, southern Africa. These samples were taken either from cultivated soils under maize monoculture, or from uncultivated soils (1989 only) adjacent to the maize fields. Analyses of mineral elements in the soil samples were performed at two independent laboratories. Furthermore, soil and maize leaf samples, from field trials in a high- and a low-risk area for oesophageal cancer were analysed. The results from this study do not agree with those reported previously for Transkei. Cultivated soils in both high- and low-risk areas were found to be highly fertile. The levels of Mn, Ni, Mg, Ca, K and soil pH were significantly higher, and Al, Fe and organic matter significantly lower in the high-risk compared with the low-risk area. Leaf analysis, although not tested statistically, indicated higher levels of Mn K, Ca and Fe, and lower levels of P, in the high-risk area.
在1982年至1989年期间的某些年份，从非洲南部特兰斯凯食管癌高风险和低风险地区采集了土壤样本。这些样本要么取自玉米单作下的耕种土壤，要么取自（仅在1989年）玉米田附近的未耕种土壤。土壤样本中的矿物质元素分析在两个独立实验室进行。此外，还对食管癌高风险和低风险地区田间试验的土壤和玉米叶样本进行了分析。本研究结果与之前报道的特兰斯凯地区的结果不一致。高风险和低风险地区的耕种土壤都被发现肥力很高。与低风险地区相比，高风险地区的锰、镍、镁、钙、钾含量和土壤pH值显著更高，而铝、铁和有机质含量显著更低。叶片分析虽然未进行统计学检验，但表明高风险地区的锰、钾、钙和铁含量较高，而磷含量较低。
