Target-Tailored Forest Damage Inventory (TFDI) - Inventory of resin top disease in young pine forests 2008

Target-tailored forest damage inventories (TFDI) aiming at providing data for operational decision making at local level and linked to specific damage events, are undertaken by the Swedish University of Agricultural Sciences. TDFIs are developed to give a rapid response to requested information on specific damage outbreaks. The TDFIs are carried out in limited and concentrated samples, with flexible but robust methods and design.

During 2008, TFDI carried out a sample inventory of resin top disease (Cronartium flaccidum) in young forest in northern Sweden (county of Norrbotten and Västerbotten). The purpose of the inventory was to estimate the area of damaged young forest, but also to highlight the geographical distribution and the appearance of the damage on different types of forest sites and in different types of regeneration.

The inventory was stratified by using data from the Swedish Forest Agency's moose grazing inventory (ÄBIN). In total 197 forest stands were inventoried. Within each stand, 8 circular sample plots with a radius of 3.5 m were inventoried. All trees in the sample plots were counted and all trees infected by resin top disease both dead and alive were noted.
Some assessed and used variables:
Tree species proportion
Number of trees
Number of infected alive trees
Number of infected dead trees
Altitude
Vegetation type – Forest classification unit based on field and ground layer vegetation
Soil humidity

See the document "Data_description" for more detailed information. As additional documentation, field instructions for the inventories are also provided.

瑞典农业科学大学开展了目标定制型森林损害调查（TFDI），旨在为地方层面的运营决策提供数据，并与特定损害事件相关联。TFDI旨在对特定损害暴发的信息请求作出快速响应。TFDI采用有限且集中的样本开展，方法与设计兼具灵活性与稳健性。

2008年，TFDI在瑞典北部（北博滕省和西博滕省）的幼林中开展了树脂顶枯病（Cronartium flaccidum）的样本调查。该调查的目的是估算受损幼林的面积，同时明确损害在不同类型林地和不同更新类型中的地理分布与表现特征。

调查利用瑞典森林局的驼鹿采食调查（ÄBIN）数据进行分层。共调查了197个林分。每个林分内设置8个半径为3.5米的圆形样地进行调查。样地内所有树木均被计数，且所有感染树脂顶枯病的活树与死树均被记录。

评估与使用的部分变量包括：树种比例、树木数量、感染树脂顶枯病的活树数量、感染树脂顶枯病的死树数量、海拔、植被类型（基于地上层与地被层植被的森林分类单元）、土壤湿度。

更多详细信息请参见文档‘Data_description’。此外，还提供了调查的野外操作指南作为补充文档。