API src

Found 318 results.

Related terms

Other language confidence: 0.6969949854333722

Terrestrial, UAV-borne, and airborne laser scanning point clouds of central European forest plots, Germany, with extracted individual trees and manual forest inventory measurements

Laser scanning point clouds of forest stands were acquired in southwest Germany in 2019 and 2020 from different platforms: an aircraft, an uncrewed aerial vehicle (UAV) and a ground-based tripod. The UAV-borne and airborne laser scanning campaigns cover twelve forest plots of approximately 1 ha. The plots are located in mixed central European forests close to Bretten and Karlsruhe, in the federal state of Baden-Württemberg, Germany. Terrestrial laser scanning was performed in selected locations within the twelve forest plots. Airborne and terrestrial laser scanning point clouds were acquired under leaf-on conditions, UAV-borne laser scans were acquired both under leaf-on and later under leaf-off conditions. In addition to the laser scanning campaigns, forest inventory tree properties (species, height, diameter at breast height, crown base height, crown diameter) were measured in-situ during summer 2019 in six of the twelve 1-ha plots. Single tree point clouds were extracted from the different laser scanning datasets and matched to the field measurements. For each tree entry, point clouds, tree species, position, and field-measured and point cloud-derived tree metrics are provided. For 249 trees, point clouds from all three platforms are available. The tree models form the basis of a single tree database covering a range of species typical for central European forests which is currently being established in the framework of the SYSSIFOSS project.

Bundeswaldinventur

Verfahrens- und Softwareentwicklung fuer das Bundesgebiet sowie Durchfuehrung der Erhebungen und Auswertungen fuer das Land Baden-Wuerttemberg. Periodische Erhebung des Waldzustandes aufgrund von Stichprobenverfahren.

Tree inventory dataset of floodplain forest, Leipzig, Germany

Leipzig is the only major German city in which extensive hardwood floodplain forests have been preserved. At present, drying out and a lack of hydrodynamics pose the greatest challenges for the conservation of the floodplain landscape. Restoring typical floodplain hydrological conditions and habitats can sustainably safeguard biodiversity and numerous ecosystem services in the medium term. To this end, the Lebendige Luppe project aim to reactivate typical floodplain hydrodynamics with inundation over large areas, the restoration of old river courses and the conversion of intensively farmed areas into typical floodplain habitats. The Lebendige Luppe project, itself is a joint project of cities of Leipzig and Schkeuditz and the NABU Saxony as implementation partner and the University of Leipzig and the UFZ-Helmholtz Centre (Partner for accompanying natural and social science) (Scholz et al. 2022). The implemented and planned restoration measures are accompanied by long-term scientific monitoring (UFZ and Leipzig University). For this purpose, 60 permanent observation plots were set up in the area of the measures according to the BACI design (Before-After / Control-Impact), on which the diversity of selected indicator groups (vegetation, molluscs, ground beetles) as well as groundwater dynamics, water and material balance in the soil, carbon storage and forest growth are recorded (Scholz et al. 2022). By integrating further landscape ecology and nature conservation data, a comprehensive analysis of the status quo and the changes in site conditions, biodiversity and ecosystem functions of the floodplain resulting from the expected floodplain dynamisation is possible, which goes beyond what has been available to date. The resulting simulation of hardwood forest responses to the changing abiotic environmental variables are already the basis for assessing the impact of the planned measures in the implementation process. This data publication contains the tree inventory data of the scientific accompanying research of the winters 2013/2014 and 2016/2017 (first inventory) and a repeat inventory from the winter of 2020/21. The Leipzig riparian forest distributed on old hardwood riparian forest (main tree population older than 90 years) of the forestry office of the city of Leipzig and Sachsenforst as state forest (Scholz et al. 2022). All stands were identified as Riparian mixed forests of Quercus robur, Ulmus laevis and Ulmus minor, Fraxinus excelsior or Fraxinus angustifolia, along the great rivers (Ulmenion minoris) – Annex I habitat type (code 91F0).

Nine years of monitoring ash dieback in the floodplain forest of Leipzig, Germany

As part of the Lebendige Luppe project, ash dieback disease was recorded on European ash trees (Fraxinus excelsior, trunks >5cm breast height diameter) on 60 plots (each 2500m²) in the late summers of 2016 to 2024. The trees were assessed according to Langer et al. (2015). However, an additional category 6 (dead tree) was introduced to distinguish between dead and dying trees. The selection of trees (according to their size) was based on 2 forest inventories (2016 and 2020) (Rieland et al. 2024, Scholz et al. 2022). As a result, new trees were added for recording in 2021. From 2020, the additional parameter Tree damage class, ash bark beetle was introduced to assess the damage caused by the ash bark beetle in 4 categories. From 2023, an additional parameter Tree damage class, ash dieback crown was introduced, which based on Lenz et al. (2012) and indicates the damage in the crown of the tree. This classification was added because, unlike the Langer et al. (2015) classification, it describes the damage class independently of the beetle infestation. A comparison of the different damage classifications enables a better description of the damage pattern. A more detailed description of the three parameters used (Tree damage class, ash dieback; Tree damage class, ash bark beetle and Tree damage class, ash dieback crown) is provided in the dataset comment.

Forstliche Umweltbeobachtung: Boden - Wasser - Luft

Ermittlung von Ausmaß, Verlauf und weiterem Fortschreiten der Walderkrankungen zur Vorbereitung und Auswertung der jährlichen Waldzustandserhebung im Rahmen der Erforschung von Ursachen für Waldschäden.

Towards pollen accumulation rates as a measure of plant abundance a case study in NE-Germany

The aim of my study is to calibrate PAR from small lakes against tree biomass, which can be used to achieve quantitative estimates of biomass in the past. Furthermore, the relation between pollen percentages and plant abundance will also be investigated. As study area, the state Brandenburg was chosen, because it has a large number of lakes and is covered by different plant communities, like conifer forest, mixed forest, deciduous forest and open land. These are situated on a range of soil types in a terrain with little altitudinal differences. Lakes in different types of landscape were selected. They were of almost uniform size, mostly ranging from 100-300 m in diameter and without inflow and outflow. Deeper lakes in proportion to the lake size were preferred, to avoid lakes with a high pollen redeposition. In order to have an effective fieldwork and to get the broadest possible data spectrum for modeling, the relevant pollen source area of pollen (Sugita, 1994) was estimated, based on the map CORINE. The calculation shows that the pollen source area is approximately 5-6 km. However, we also sampled lakes which are situated closer together, especially when the landscape structure was very heterogenic at the small scale. From the surface samples of 50 lakes, the pollen percentages of different taxa will be compared with the information from the forest inventory data for different distances around the lakes to evaluate theoretical considerations of pollen source area. These data are available at the data base Datenspeicher Wald, which contains information about cover, age and biomass for the different tree species. This information was collected during the time of the German Democratic Republic (DDR) and is in the most continued. Concurrently, 15 of the short cores are selected for dating by 210Pb. PAR will be calculated based on the sedimentation rates obtained for these cores, so that PAR can be compared to tree biomass for different time slices over the past 50 years.

BiodivMon: Verbesserung des europäischen Biodiversitätsmonitorings im Wald durch intelligente Kombination vorhandener Daten (ForBioMon)

Clustered Subsampling of Double Sampling for Stratification and Growth Model Based Updates of Past Forest Inventories

Double Sampling for Stratification is a sampling design that is widely used for forest and resource inventories worldwide and, particularly, well established for periodic forest inventories of districts in public and private forests in Germany. Spatially clustered subsampling of second-phase units, actually representing a third phase of sampling, can be expected to reduce travelling costs, but will also decrease precision of estimates. Therefore, the proposed project is intended to develop estimators for totals and per hectare values of usual target variables in forest inventories as well as related sampling errors under that new three-phase sampling design. Using real data the trade-off between precision and amount of clustering will be analyzed. A special focus will be on temporary regional or state-wide inventories based on previous double sampling district inventories. In this case additional precision can be gained by updating the previous inventories using growth models. These growth predictions shall be combined with the sample based estimator to form a composite estimator of higher precision.

Entwicklung von Konzepten zur langfristigen naturnahen agroforstlichen Bewirtschaftung von Araucarienwaelder und Erschliessung kurzfristiger Nutzungsmoeglichkeiten in Wiederaufforstungszonen 'pro-mata/pro-araucaria'

Entwicklung eines nachhaltigen Nutzungskonzeptes - im Sinne des Begriffs 'sustainable use', Wiederherstellung und Bewahrung naturnaher Waldbestaende und ihrer Oekosysteme, Verbesserung der Lebensbedingungen in der Region durch Schaffung nachhaltiger Existenzgrundlagen fuer die oertliche Bevoelkerung. Zur Erreichung der gesteckten Oberziele sieht das Projekt der Fachhochschule Rottenburg in der ersten Phase folgende Massnahmen vor: Inventur des aktuellen Zustandes der Wald- und Freiflaechen durch: Luftbildbefliegung und -kartierung des Gebietes, zweite terrestrische Inventurstufe (Stichproben): Boden- bzw. Standortskartierung, Anlage von Versuchs- und Kontrollflaechen zur Ermittlung der Standortseignung, der Wuchsdynamik, der Verjuengungsdynamik und der natuerlichen Sukzession, geeigneter Pflanzverfahren, Mitwirkung an der Nutzungsplanung fuer das gesamte Projektgebiet.

Betriebsinventur - Beratung, Analyse, Konzeptionelle Weiterentwicklung

Die Betriebsinventur ist das zentrale Instrument für die Erfassung des naturalen Waldzustand und liefert alle benötigten quantitativen und bis zu einem gewissen Grad auch qualitative Informationen für die Nachhaltskontrolle und -sicherung im Rahmen der Forsteinrichtung. Insbesondere die permanenten Inventuren bilden das Rückgrat eines langfristig angelegten Monitoringkonzepts, welches die Walddynamik mit hoher Genauigkeit beschreibt. Gerade vor dem Hintergrund sich wandelnder Umweltbedingungen und dem daraus resultierenden Konzept einer adaptiven Waldbewirtschaftung ist eine konsequente und möglichst umfassende, zuverlässige Erfassung des Waldzustands erforderlich. Im Rahmen dieser Daueraufgabe wird zum einen die Beratung der Nutzer von BI-Daten und -Auswertungen gewährleistet, die über Standardauswertungen hinausgehen. Die Verfügbarkeit wachsender Datenbestände sowie die zunehmende Anzahl von Wiederholungsinventuren eröffnen neue und weitergehende Auswertungsmöglichkeiten, welche auch anspruchsvollere statistische Analysetechniken erfordern. Die verstärkte Nutzbarmachung und Erschließung des Informationspotenzials der Betriebsinventuren ist daher vordringlich. Dabei sollen die Daten auch für andere Fragestellungen wissenschaftlicher Art (Waldwachstum, Waldökologie, Standortskunde) nutzbar und entsprechend aufbereitet werden. Nutzungspotenzialabschätzungen auf lokaler Ebene (Landkreise) werden zunehmend nachgefragt und erfordern spezifische Auswertungen und Analysen. Die Weiterentwicklung, im Hinblick auf Optimierung und Verbesserung des Informationsgewinns, z.B. durch Verfahren der Kleingebietsschätzung, ist eine weitere Aufgabe. Eine konzeptionelle Herausforderung besteht darin, die Betriebsinventur, die auf lokaler/regionaler Ebene operiert, zusammen mit der Großrauminventur (BWI) in ein integriertes Informationssystem einzubeziehen. Zu den konzeptionellen Fragen gehört auch die Einbeziehung externen Informationsquellen, wie Fernerkundungsdaten (Luftbilder, flugzeuggetragenes Laserscanning). Daraus lassen sich unter Umständen Konzepte zur Optimierung des Inventurdesigns ableiten.

1 2 3 4 5 … 30 31 32