ICS 65.020.40 B64 LY 中 华 人 民 共 和 国 林业行 业 标 准 LY/T 3178—2020 西北华北山地 次生林经营技术规程 Technical Regulation of Secondary Forest Manage ment in the mountain areas of Northwest and North China 2020 - 03 - 30发布 2020 - 10 - 01实施 国家林业 和草原局 发布 LY/T 3178—2020 I 目 次 前言 ................................ ................................ ................................ ................................ ................................ .... II 1 范围 ................................ ................................ ................................ ................................ .............................. 1 2 规范性引用文件 ................................ ................................ ................................ ................................ .......... 1 3 定义和术语 ................................ ................................ ................................ ................................ .................. 1 3.1 天然林经营模式 Natural forest management models ................................ .............................. 1 3.2 林分经营 Stand -oriented management ................................ ................................ ........................... 1 3.3 林分拥挤程度 Stand crowded degree ................................ ................................ .......................... 1 3.4 幼树开敞度 The open degree of saplings ................................ ................................ .............. 1 3.5 单株木经营 Tree-orien ted management ................................ ................................ ......................... 2 3.6 针叶树为主的针阔混交林 Coniferous and broad -leaved mixed forest with coniferous - dominated ................................ ................................ ................................ ................................ ........................... 2 3.7 阔叶树为主的针阔混交林 Coniferous and broad -leaved mixed forest with broad -leaved dominated ................................ ................................ ................................ ................................ ........................... 2 3.8 针阔均衡的针阔混交林 Coniferous and broad -leaved mixed forest with on balance . 2 3.9 特大树 Very big trees ................................ ................................ ................................ ................... 2 3.10 大树 Big trees ................................ ................................ ................................ ................................ 2 3.11 小树 Small trees ................................ ................................ ................................ ............................ 2 3.12 小径木林分 Forestry with small trees -dominated ................................ ................................ .. 2 3.13 大径木林分 Forestry with big trees -dominated ................................ ................................ ...... 2 3.14 特大径木林分 Forestry with very big trees-dominated ................................ ....................... 2 4 经营指标 ................................ ................................ ................................ ................................ ...................... 2 4.1 经营强度 ................................ ................................ ................................ ................................ ............... 2 4.2 林分拥挤度调整 ................................ ................................ ................................ ................................ ... 2 4.3 大树均匀性调整 ................................ ................................ ................................ ................................ ... 3 4.4 林分成层性调整 ................................ ................................ ................................ ................................ ... 3 4.5 幼树开敞度调整 ................................ ................................ ................................ ................................ ... 3 5 西北华北山地次生林经营模式 ....................