Citation: | Kang-kang Xu, Hong-wei Sun, Wei Xie, Fu-qing He, Xiao-yang Liu, Kai Sun, Sheng-fei He, Xing-yuan Wu, Peng-hui Gong, Godfrey Machumu, 2023. Characteristics of B, Zn and Se in stream sediments of Tanzania and their agricultural applications: Based on 1∶1000000 geochemical survey, China Geology, 6, 1-14. doi: 10.31035/cg2022049 |
Tanzania is located in eastern Africa with a predominantly agricultural ecomomy, the potential for developing and utilizing cultivated land are promising, but scientific guidance is required. B, Zn and Se are essential micronutrients for plants and human body with crucial biological functions, in particular, Se is significant for human health and considered as “the king of anti-cancer”. As these elements required by human or plants are mainly absorbed from soil directly or indirectly, therefore, it is important to understand the contents and distributions of them in the soil of cultivated land for guiding agricultural production. In this work, low-density geochemical survey at the scale of 1∶1000000 was carried out in Tanzania, and the results show that the concentrations of B, Zn and Se in stream sediments are low and their distributions are heterogeneous. According to the distributions of geological units, the existing cultivated land resources can be divided into five regions in Tanzania. Compared with the national background values, the concentrations of B, Zn and Se are insufficient overall but enriched locally in these regions. In general, element concentrations in stream sediments and soil have a positive correlation because of their similar sources, which is essential in agriculture application. Based on the information provided by low-density geochemical data and maps, the Se-sufficient and Se-rich regions were delineated in Tanzania, where can be used to develop Se-rich industries. Finally, this paper believes that geochemical survey is a powerful tool for cultivated land evaluation, agriculture management and land development.
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Simplified geological map of Tanzania showing the location of the Archean Craton, the surrounding mobile belts and the sedimentary basins (after Boniface N et al., 2017; Manya S et al., 2006).
Sample sites map of low-density geochemical survey in Tanzania.
Histograms and boxplots displaying the statistical B, Zn and Se distributions in stream sediments of Tanzania.
Distribution map of B in stream sediments of Tanzania.
Distribution map of Se in stream sediments of Tanzania.
Distribution map of Zn in stream sediments of Tanzania.
Plot of the average values of 39 elements in stream sediments against the background values of soil in China, showing that the ratios are almost close to 1.
Division map of the existing cultivated land in Tanzania
Boxplots showing the B, Zn and Se variations in stream sediments in different areas of Tanzania.
Development and utilization of Se-rich land in China.
Se-rich agricultural products grown in China (a, b, c and d are Se-rich rice, tea, vegetable and fruit, respectively).