ICS 13.020.01 Z 01 DB11 北京市地方标准 DB11/T 1721—2020 水生生物调查技术规范 Technological regulations for hydrobiological investigation 2020 -03-25发布 2020 -07-01实施 北京市市场监督管理局发布 DB11/T 1721—2020 目次 前言...................................................................................................................................................................II 1范围 ..........................................................................................................................................................1 2规范性引用文件 ..........................................................................................................................................1 3术语和定义 ..................................................................................................................................................1 4水生生物调查程序 ......................................................................................................................................2 5水生生物调查点、频率和记录 ...................................................................................................................3 6浮游植物调查 ..............................................................................................................................................4 7浮游动物调查 ..............................................................................................................................................7 8大型底栖动物调查 ......................................................................................................................................9 9大型水生植物调查 ....................................................................................................................................11 10着生藻类、着生原生动物调查 ...............................................................................................................13 11鱼类调查 ...........................................................................................