成都市主城区水中尸体多发河流区段硅藻分布

摘要

ObjectiveTo explore the species distribution and constituent ratio of diatoms in main sections of urban district rivers where drowning occurs frequently in Chengdu.MethodsTotal 39 water samples from the sampling points of 5 rivers(Jinjiang, Jinniu, Qingyang, Wuhou and Chenghua districts)in Octo-ber 2014 were collected. The diatoms smear were made and the species distribution and constituent ratio of diatoms from the water samples were analyzed using biological microscope and acquisition system of digital microscope.ResultsTotal 21 species of diatoms were detected in main sections of urban district rivers in Chengdu. Significant differences in the dominant diatom species and proportions of the different rivers were observed, and there were different species existed in all sampling points of the upstream, midstream and downstream of the rivers.ConclusionThe database of species map, species distribution and constituent ratio of diatoms in main sections of urban district rivers in Chengdu are preliminarily es-tablished, which has special meaning for the analysis and evaluation of falling location inference using diatoms test in case investigation.%目的：研究成都市主城区水中尸体多发河流区段所含硅藻的种属分布。方法采集2014年10月成都市（锦江区、金牛区、青羊区、武侯区、成华区）5条河流区段共39个采水点水样标本，制作硅藻涂片后运用生物显微镜及数码显微采集系统对水样中硅藻种属分布及构成比进行研究。结果成都主城区所检水域共检见硅藻种属21种，各水域硅藻优势种属及构成比存在差异。各河流区段上、中、下游采样点均存在差异藻属。结论初步建立了成都主城区河流区域性硅藻种属图谱及区段性种属分布构成比数据库，对分析评价硅藻检测在案件侦查中推断落水点具有特殊意义。