ZHANG Husheng1, YU Tao 2, YANG Zhongfang1, MA Xudong1, WU Zhiliang1, 

LIN Kun1, LI Minghui3

（1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 

2. School of Science, China University of Geosciences, Beijing 100083, China; 

3. Chengdu Geological Survey Center, China Geological Survey, Chengdu 610082, China）

Abstract：Iron (Fe) is one of the essential trace elements for the human body and plays a very important role, but insufficient or excessive intake of Fe will cause severe health problems. Diet is the main way of Fe intake, so the content of Fe in food directly affects human health, but there are few studies on the prediction of Fe in soil crop system and the evaluation of dietary intake at the regional scale. In this paper, 109 sets of corn and root soil samples and 6980 topsoil samples were collected in Linshui County, Sichuan Province. We studied the spatial distribution characteristics of Fe in soil and crops and carried the geochemical assessment of iron nutrition and dietary supplementation. The results showed that the range of Fe content in the topsoil of Linshui county is 3.07-198.10 mg/g, and the arithmetic mean value is 52.37 ± 1.27 mg/g. the average content of soil Fe in the study area is significantly higher than the background value of soil Fe in China. The arithmetic mean of Fe content in maize seeds in the study area was 15.57 ± 2.89 mg/kg, which was significantly lower than the mean of Fe content in Maize in China. The prediction model of the Fe bioconcentration coefficient of maize was established to predict the Fe content of maize seeds. According to the recommended value of daily average Fe content recommended by the China Nutrition Society and the survey results of dietary nutrition of residents in the study area, the optimal Fe content range of Maize in the study area was 13.88~30.85mg/kg. Dietary intake in the study area was assessed; The results showed that most Fe intake was sufficient in this area; insufficient intake only sporadic distributed, accounting for 3.87% of the total cultivated land in the study area. Consuming locally produced corn cannot meet human Fe demand. Therefore, the zoning map of Fe trace elements in different areas of edible corn is given, which provides a scientific basis for residents in the study area to prevent health diseases caused by Fe deficiency.

Key words：iron; soil; crop; dietary pattern

EARTH AND ENVIRONMENT Vol.51, No.2, Tot No.352, 2023, Page 216