Journal of Forensic Medicine ›› 2022, Vol. 38 ›› Issue (1): 92-97.DOI: 10.12116/j.issn.1004-5619.2021.410603

Special Issue: 水中尸体研究专题

• Original Articles • Previous Articles     Next Articles

Change Rule of Diatom in Zhangweixin River in Dezhou

Peng LI1(), Ping WANG2,3, Yi-gang ZHANG1, Kun HU1, Ming-jun YUAN1, Lei-lei ZHANG4()   

  1. 1.Material Evidence Authentication and Research Center of Dezhou Public Security Bureau, Dezhou 253000, Shandong Province,China
    2.People’s Public Security University of China, Beijing 100038, China
    3.Institute of Forensic Science, Ministry of Public Security, Beijing 100038, China
    4.Institute of Forensic Science, Shandong Provincial Public Security Bureau, Jinan 250001, China
  • Received:2021-06-08 Online:2022-02-25 Published:2022-02-28
  • Contact: Lei-lei ZHANG

Abstract: Objective

To study the annual variation of diatoms in Zhangweixin River, to provide theoretical support by using diatom examination to estimate the time and place of the corpse entering water, and to establish a diatom database.

Methods

Samples were taken from 4 sampling sites in Decheng section of Zhangweixin River for 12 consecutive months. Non-metric multi-dimensional scaling (NMDS) analysis was performed on the species and content of diatom samples. Based on the sampling site of Tianqu Road, Sprensen similarity coefficient analysis was conducted with the data of other 3 sites in Decheng section and Leling section of Zhangweixin River and Ningjin section in previous studies.

Results

The number of diatom species was positively correlated with diatom content. The average diatom content in different months ranged from 1 054 to 13 041/10 mL, and the species composition ranged from 8 to 16, with differences in dominant species. The similarity coefficient of diatom species within 2 km were all higher than 0.956 52, which could not be distinguished effectively. The similarity coefficients of Leling section and Ningjin section were 0.736 84 and 0.588 24 respectively, which could be effectively distinguished.

Conclusion

The species and content of diatom vary in different months in Zhangweixin River, and the composition of diatom species is different in different basins, which can provide reference for estimating the time and place of the corpse entering water in the river.

Key words: forensic pathology, diatom test, drowning, law of change, Zhangweixin River, Shandong

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