National Forest Inventory 12

National Forest Inventory (NFI) is a forest monitoring system based on systematic sampling on all land. Nowadays, NFI is repeated in every 5 years. These data are from the 12th NFI cycle (2014-2018). 60% of the NFI12 field plot clusters are permanent, 40% are temporary. The data contain selected variables describing the forest stand where the NFI sample plot has fallen. In addition, the data include biomass (metric tons per hectare) and volume of growing stock (cubic meters per hectare) by species group measured at the plot location. If the plot are divided in two stand compartments, both stand compartment have an individual data record. In such a case, the plot biomasses or volumes are not corrected by the relative size of the partial plot. Plot coodinates are given at 1 kilometer accuracy to protect the permanent plots.国家森林清查（National Forest Inventory, NFI）是一套基于全地域系统抽样的森林监测体系。当前，该清查每5年开展一轮循环监测。本次所用数据取自第12次国家森林清查周期（2014-2018年）。第12次清查的野外样地群中，60%为永久性样地，剩余40%为临时性样地。本数据集包含用于描述NFI样地覆盖林分的精选变量；此外，还包含按树种组划分的样地生物量（单位：吨/公顷）与活立木蓄积量（单位：立方米/公顷）实测数据。若某样地被划分为两个林分单元，则每个林分单元均对应一条独立的数据记录。此种情况下，未依据分块样地的相对面积对样地生物量或蓄积量进行校正。为保护永久性样地的位置信息，样地坐标仅保留1公里精度。

搜集汇总

背景与挑战

背景概述

该数据集是芬兰国家森林资源监测系统（NFI）的第12个周期数据，覆盖2014年至2018年，基于系统采样收集森林林分变量、生物量和蓄积量信息，坐标精度为1公里以保护永久样地。数据由芬兰自然资源研究所发布，是开放且持续增长的林业资源数据集，主要用于森林调查和资源管理研究。