Swedish National Forest Inventory: Presence-absence vegetation data (1995-2017, discontinued sample)

Записи данных

Данные этого sampling event ресурса были опубликованы в виде Darwin Core Archive (DwC-A), который является стандартным форматом для обмена данными о биоразнообразии в виде набора из одной или нескольких таблиц. Основная таблица данных содержит 26 102 записей.

Также в наличии 2 таблиц с данными расширений. Записи расширений содержат дополнительную информацию об основной записи. Число записей в каждой таблице данных расширения показано ниже.

Данный экземпляр IPT архивирует данные и таким образом служит хранилищем данных. Данные и метаданные ресурсов доступны для скачивания в разделе Загрузки. В таблице версий перечислены другие версии ресурса, которые были доступны публично, что позволяет отслеживать изменения, внесенные в ресурс с течением времени.

Версии

В таблице ниже указаны только опубликованные версии ресурса, которые доступны для свободного скачивания.

Права

Исследователи должны соблюдать следующие права:

Публикующей организацией и владельцем прав на данную работу является Swedish National Forest Inventory, Department of Forest Resource Management, SLU. Насколько это возможно по закону, издатель отказался от всех прав на эти данные и посвятил их Public Domain (CC0 1.0). Пользователи могут без ограничений копировать, изменять, распространять и использовать работу, в том числе в коммерческих целях.

Этот ресурс был зарегистрирован в GBIF, ему был присвоен следующий UUID: e1a32bea-73df-4b9b-af2e-6e148ab2641b.  Swedish National Forest Inventory, Department of Forest Resource Management, SLU отвечает за публикацию этого ресурса, и зарегистрирован в GBIF как издатель данных при оподдержке GBIF Sweden.

Ключевые слова

sampling event; forest land; mires; rock surface; subalpine woodland; pasture land; alpine areas; survey; standardised inventory; forest statistics; stratified sampling; presence; absence; field layer; bottom layer; coverage; Samplingevent

Контакты

Географический охват

Data is collected across the whole of Sweden.

Таксономический охват

Approximately 240 species or species groups of vascular plants, lichen and mosses occurring in the Swedish landscape.

Временной охват

Данные проекта

The Swedish National Forest Inventory has the task of describing the state and changes in Sweden's forests. The information collected is used, for example, as a basis for forestry, energy and environmental policy in Sweden. Data from the Swedish National Forest Inventory is part of Sweden's official statistics. At the heart of the Swedish National Forest Inventory is the annual inventory which is undertaken by ca 50 field workers during the snow free period. Every year an inventory is carried out on ca 12 000 sample plots with measurements collected from ca 95 000 trees and a large range of other variables describing the stand, site and history of the sample plot.

Исполнители проекта:

Методы сбора

The Swedish National Forest Inventory sample plots are circular and are, for practical reasons, grouped into clusters (tracts). The tracts are square or rectangular in shape and are of different dimensions in different parts of the country. The density of tracts and the number of sample plots per tract also varies among different parts of the country, with a higher sample density in southern Sweden. Two thirds of the sample consist of permanent tracts and one third are temporary tracts. Sampling is done annually for a subsample of tracts. The permanent tracts are revisited every 5th year and the temporary tracts are only visited once. The true coordinates of the permanent sample plots are protected. The coordinates in this dataset are generalized (randomly obfuscated with 200-1000 m). Vegetation survey on permanent field plots: This dataset consists of presence/absence data for 242 species/species groups (18 ground layer species, 187 field layer species and 37 tree/shrub layer species). Registration of coverage is performed in a separate inventory for 71 species/species groups including “no coverage” (this data is not included in this dataset). The vegetation inventory is undertaken every 10th year on permanent plots. The plot can be divided into smaller parts if it’s crossed by edges between different types of land use classes or forest stand categories. The sample population for presence/absence registration is all forest land (landuse classes Productive forest land, Mires, Rock surface, Subalpine woodland, Pasture land and, since year 2016, Alpine areas). The sample size (number of permanent sample plots where presence/absence registrations are performed) was reduced by 50% from year 2018 and onwards. This dataset consists of the reduced sample. The supplement data from the discontinued sample for the period 1995-2017 is available in the related dataset 'Swedish National Forest Inventory: Presence-absence vegetation data (1995-2017, supplement sample)'. Descriptions of the survey scheme can be found on https://www.slu.se/centrumbildningar-och-projekt/riksskogstaxeringen/om-riksskogstaxeringen/om-inventeringen/ (detailed information available in Swedish only).

Описание этапа методики:

1. Sample plots are visited by qualified field personal who survey a number of forest parameters and sample vegetation by recording presence/absence for a specified list of species of vascular plants, mosses and lichens. Species that were detected are recorded as present, species that were not detected are recorded as 'absent'. Coverage is record for a subset of the species. The circular samling plot (radius=5.64 m) can be divided into smaller parts if it is crossed by edges between different types of land use classes or forest stand categories. The sample population for presence/absence registration is all forest land (landuse classes Productive forest land, Mires, Rock surface, Subalpine woodland, Pasture land and, since year 2016, Alpine areas).

Данные коллекции

Библиографические ссылки

1. Fridman J., Holm S., Nilsson M., Nilsson P., Ringvall A. H., Ståhl G. (2014). Adapting National Forest Inventories to changing requirements the case of the Swedish National Forest Inventory at the turn of the 20th century. Silva Fennica vol. 48 no. 3 article id 1095. http://dx.doi.org/10.14214/sf.1095

Дополнительные метаданные