Sven Wagner

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• Prof.Dr.
• Retired Professor at TU Dresden

The direct seeding method of artificial regeneration has a long tradition in silvicultural management. The main application of the direct seeding of silver fir (Abies alba Mill.) today occurs in the context of the conversion of Norway spruce stands in central Europe. Although direct seeding is often considered to closely resemble natural regenerati...

Fine roots are of major importance for belowground processes in mangrove ecosystems. Little is known about individual mangrove root systems, particularly the fine root component. We measured fine root biomass distribution of solitary standing Rhizophora mangle L. individuals with the dual aim of (a) deepening our understanding of the belowground ec...

1. The importance of tree mixtures to the faunal and floral biodiversity of forests has been documented on many occasions, but little is known about the relationships between single-tree effects, such as litter distribution and carabid beetles. 2. The aim of the study was to investigate the relationship between the occurrence of carabid beetles and...

Climate change and an accelerating loss of biodiversity result in unpredictable risks to the development of forest ecosystems. Forest management and the forest sciences face a high degree of uncertainty in combination with increasing demands for the provision of multiple, and sometimes conflicting, ecosystem services. In the densely populated lands...

In the course of climate change, natural regeneration of oaks (Quercus spp.) is gaining in importance for forest conversion to climate-adapted mixed forests. In order to predict areas in which natural oak regeneration could establish, variables influencing the occurrence and density of oak regeneration were identified using geostatistical zero-alte...

Wild pear [Pyrus pyraster (L.) Burgsdorf, 1787], also called the European wild pear, is an underestimated forest tree species. Despite its large range in Europe, the species is rare. It is assumed to be threatened by hybridization with pears cultivated throughout Europe. Therefore, the species is a concern of conservation efforts today. A prerequis...

The genus Quercus, including species like pedunculate oak (Quercus robur L.), can play a key role in maintaining climate-resistant mixed forests due to its broad ecological spectrum and drought tolerance. Unfortunately, in some parts of Europe, clearcutting has drastically reduced the oak population. An example of this event is our survey of herita...

There are growing doubts about the true role of the common mycorrhizal networks (CMN or wood wide web) connecting the roots of trees in forests. We question the claims of a substantial carbon transfer from ‘mother trees’ to their offspring and nearby seedlings through the CMN. Recent reviews show that evidence for the ‘mother tree concept’ is incon...

Poplar species such as aspen (Populus tremula L.) play a very important role in the forest formation process not only in Eastern European regions. Unfortunately, such aspen stands are often severely affected by fungal diseases, causing mainly core rot. In this study, the indirect effects of thinning on the phytosanitary condition of aspen by promot...

The climate change is leading to a significant increase in temperatures and dry periods in spring, for example in parts of middle and north Europe. Thus, the important factor for tree growth, the water availability, decreases on forest sites. It is to be expected that the successful establishment of pioneer tree species as pre-forests on large dama...

Successful European beech (Fagus sylvatica L.) regeneration is both of great ecological and economical importance in European forest ecosystems and severely threatened by climate change impacts. To increase our knowledge of beech regeneration dynamics under climate change and the potential for controlling it through forest management, we studied in...

Forest structure is an essential key to successful and sustainable poor forest restoration. The study was conducted in Kon Ka Kinh National Park, Gia Lai, Vietnam. Ten plots were made in secondary and also ten plots in old-growth forests. Research results have shown that the secondary forest had a greater density, but the tree sizes are smaller tha...

Seed dispersal and environmental heterogeneity, and the effects of their interaction, are perceived to be determinants of the spatial patterns of trees. We applied the spatial point process to analyse Vatica odorata (Griff.) Symington (Dipterocarpaceae) in Cuc Phuong National Park of Vietnam to understand its spatial patterns, and to decipher the m...

Current management strategies for European Scots pine (Pinus sylvestris L.) forests are oriented towards the use of natural regeneration processes. They aim to maintain continuity of stand structure by preserving seed-producing and shelter trees at varying densities. Soil scarification techniques may be employed to support the natural regeneration...

About 100 years ago, groups of European beech were reintroduced into Norway spruce stands in some parts of Germany as a restoration approach. The aim of this approach was to maintain or rehabilitate the ecological function of soil fertility and the regeneration option of beech for the next generation. The effect of beech groups on surrounding spruc...

Der Wissenschaftliche Beirat für Biodiversität und Genetische Ressourcen (WBBGR) regt eine aktive Mitwirkung des Bundesministeriums für Ernährung und Landwirtschaft (BMEL) an der laufenden Erarbeitung einer neuen Nationalen Biodiversitätsstrategie (NBS) an. Da etwa 50% Deutschlands von landwirtschaftlicher Nutzfläche und knapp 30% von Wald bedeckt...

1) Due to global warming, distribution ranges of temperate tree species are shifting north-wards and upslope to cooler areas. Shifts in distribution first become visible through changes in regeneration dynamics. However, the future distribution of tree species in the face of rapid climate change depends not only on the climatic suitability of the t...

The success of beech regeneration depends on resource availabilities, which are both heterogeneously distributed in forests and influenced by climate change impacts such as drought and heat waves. To ensure beech regeneration success in the future, it is therefore of great interest to understand the influences of different resource availabilities a...

Die Integration spontaner Buchen- und Eichenverjüngung in Verjüngungsentscheidungen ist heute eine wichtige Zielstellung einer ökologisch orientierten Forstwirtschaft. Regionale und lokale Informationen zum Ausbreitungspotenzial beider Baumarten sind bisher unzureichend. Als Grundlage für waldbauliche Entscheidungen soll eine Potenzialanalyse für k...

Aufgrund der Klimaerwärmung verschieben sich die Verbreitungsgebiete der Baumarten der gemäßigten Zonen nach Norden und in kühlere Gebiete [5, 6, 10]. Verschiebungen in der Verbreitung werden zunächst durch Veränderungen in der Verjüngungsdynamik sichtbar [1, 8, 9]. Die zukünftige Verbreitung von Baumarten angesichts des raschen Klimawandels hängt...

Für den Waldumbau soll die Ausbreitung von Laubgehölzen im Rahmen der Bestandessukzession für das konkrete waldbauliche Bewirtschaftungsziel berücksichtigt werden [3]. Je nach räumlicher und zeitlicher Intensität sowie Qualität der Naturverjüngung kann eine kostenintensive künstliche Einbringung verzichtbar sein. Mit der Hilfe geeigneter Prognosewe...

The article “Restrictions on natural regeneration of storm-felled spruce sites by silver birch ( Betula pendula Roth) through limitations in fructification and seed dispersal”, written by Katharina Tiebel, Franka Huth, Nico Frischbier and Sven Wagner, was originally published Online First without Open Access.

Die Integration spontaner Eichenverjüngung in Verjüngungsentscheidungen ist heute eine wichtige Zielstellung einer ökologisch orientierten Forstwirtschaft. Regionale und lokale Infor-mationen zum Ausbreitungspotenzial von Eichen sind bisher unzureichend. Als Grundlage für waldbauliche Entscheidungen gilt es anhand von Inventurdaten abzuschätzen, wi...

Fire is a disturbance factor in the gallery forests and palm swamps of the Orinoco region of Colombia, due to the recurrent burnings of the surrounding savannas. Since fire is used as a cost-effective land-management tool, savannas are usually burned once a year in the dry season. This chapter evaluates how fire frequencies impact the regeneration...

The potential utilisation of natural regeneration of European beech (Fagus sylvatica L.) for forest conversion has received little attention to date. Ecological knowledge is necessary to understand and predict successful natural regeneration of beech. The objective of this study was to improve understanding of what drives the occurrence of beech re...

Outcomes after an abrupt, storm-caused loss of spruce shelterwood (Picea abies L. Karst.) overstories on advanced planted beech (Fagus sylvatica L.) were investigated, including effects of developmental stage and beech stand density on growth after release. Six years after overstorey loss by storm Kyrill in January 2007, heights and root collar dia...

The importance of local forests as places of recreation and human well-being depends very much on their visual impact on human perception. Forest managers, therefore, seek to achieve structural elements or attributes that can be used to enhance the visual aesthetics of managed forest ecosystems. The following survey was undertaken in the Tharandter...

Sorbus aucuparia L. (rowan) and Betula spp. (birch) are the most common of the early successional pioneer tree species in central Europe with the ability to form a soil seed bank. Little is known about the reasons for the high variations observed in the persistence in the soil of rowan and birch seeds. The objective of this study was to assess the...

The multiple-use approach to forestry applied in Germany aims to combine timber production and habitat management by preserving specific stand structures. We selected four forest stand types comprising (i) pure oak, (ii) equal oak–pine mixtures, (iii) single tree admixtures of oak in pine forest and (iv) pure pine. We analysed the effects of stand...

Mangroves are recognised for their diverse set of ecosystem services, includ ing protection from tropical cyclones and tidal surges. Mangroves are adapted to withstand disturbanc es across a range of clima tic conditions , and the frequency and severity of disturbanc es are projected to increase in the coming years du e to clima te ch ange and sea-...

Die Salweide ist eine wichtige Pionier- und Vorwaldbaumart. Häufig wird auf das enorme Ausbreitungspotenzial ihrer Samen verwiesen. Doch was ist Mythos, was ist tatsächlich wahr? Bisher fehlten konkrete Informationen zu Ausbreitungsdistanzen auf Grundlage von Samenfängen und Auszählungen. Neue Aufnahmen schließen diese Wissenslücke.

The use of natural oak regeneration from admixed oaks and neighbouring oak stands provides an interesting alternative to cost-intensive artificial oak regeneration when aiming for forest conversion of pure coniferous stands. In this study analysis of forest inventory data is done on how far and in what density natural regeneration of both Peduncula...

Im Rahmen des Waldumbaus im Sächsischen Staatswald soll die Verjüngung von Laubgehölzen (Bestandessukzession) im waldbaulichen Bewirtschaftungsziel des Einzelbestandes berücksichtigt werden. Mit der Hilfe geeigneter Prognosewerkzeuge soll deshalb die sogenannte spontane Naturverjüngung räumlich vorhergesagt werden.

In a region with poor soil fertility, low annual precipitation and large areas of homogenous Pinus sylvestris L. forests, conservation of old sessile oak (Quercus petraea (Matt.) Liebl.) trees is one option to enrich structure and species richness. We studied the affinities of Carabus coriaceus, C. violaceus, C. hortensis and C. arvensis for specif...

Die Sandbirke als Pionierbaumart besiedelt besonders häufig große Störungsflächen. Diese natürliche Wiederbewaldung ist jedoch nicht immer erfolgreich und unmittelbar nach dem Schadereignis oft nur schwer vorherzusagen. Komplexe Faktoren beeinflussen die Ausbreitungsdistanzen und Ablagerungsdichten von Birkensamen. Neue Forschungsergebnisse können...

Particularly after disturbance events, the early successional colonist Betula pendula Roth is experiencing renewed silvicultural interest with respect to the natural regeneration of large disturbed forest areas. In a case study, we therefore studied the seed dispersal of B. pendula from two adjacent spruce stands to large storm-felled sites at high...

Agricultural landscapes host a significant share of the biological diversity in Germany. Protecting and advancing this diversity is an established societal goal. First, Germany has committed to national and international obligations to protect biodiversity in the sense of nature protection. Second, biodiversity secures genetic pools which could bec...

Das Diskussionspapier „Ackerbaustrategie 2035 – Perspektiven für einen produktiven und vielfältigen Pflanzenbau“ des BMEL zeigt anhand von sechs Leitlinien und zwölf dazugehörigen Handlungsfeldern Optionen für die Verbesserung des deutschen Ackerbaus auf. Es enthält viele sinnvolle Ansätze. Allerdings greift das Papier bezüglich des Erhalts und der...

Großflächige Schadereignisse werfen immer wieder die Frage nach der Zweckmäßigkeit von kostenintensiven Wiederaufforstungsmaßnahmen auf. Meist stehen den Forstbetrieben nicht die nötigten finanziellen und personellen Mittel zur Verfügung, um in kurzer Zeit die Schadholzaufarbeitung und Aufforstung zu gewährleisten. Vorwaldstrukturen von Pionierbaum...

Utilization of natural beech regeneration as a part of the forest conversion is an interesting alternative to cost-intensive planting. The range of effective dispersal of beech regeneration is of interest for the spatial assessment of regeneration potential. Aim of the study was to investigate the influence of the distance to the nearest potential...

Zusammenfassung: Das Diskussionspapier „Ackerbaustrategie 2035 – Perspektiven für einen produktiven und vielfältigen Pflanzenbau“ des BMEL zeigt anhand von sechs Leitlinien und zwölf dazugehörigen Handlungsfeldern Optionen für die Verbesserung des deutschen Ackerbaus auf. Es enthält viele sinnvolle Ansätze. Allerdings greift das Papier bezüglich de...

Qualea grandiflora Mart. (Vochysiaceae) is one of the most widespread species within the cerrado formation, which counts amongst the most threatened ecosystems worldwide. Understanding the regeneration ecology of Q. grandi-flora is a central requirement for the success of conservation measures and silvicultural management strategies. Exhaustive inv...

Berichte über Landwirtschaft (ISSN 2196-5099)

Conservation concessions (CC) within the REDD+ project have been promoted as mechanisms to protect the primary forest from anthropogenic disturbances in the Peruvian Amazon. However, economic activities by human settlements located in buffer zones of those concessions, have affected the common forest resources given to these groups. Therefore, with...

1) Background: Leaf area index (LAI) is an essential structural property of plant canopies and is functionally related to fluxes of energy, water, carbon, and light in ecosystems; coupling the biosphere to the geo-, hydro-, and atmosphere. There is an increasing need for more accurate and traceable measurements among several spatial scales of inves...

Due to a lack of oak seeds and planting material at the north-eastern limit of the distribution range of European oak forests (study area: Republic of Tatarstan, Russia), the high initial plant densities typical of oak stands established in central Europe for the production of valuable timber is not feasible in this region. In Russia, the low numbe...

Das Potenzial der Salweide bei der naturnahen Wiederbewaldung von Störungsflächen wird vor allem durch die Konstitution der Elternbäume und den daraus resultierenden Fruchtbehang bestimmt. Obwohl die Salweide aus ökologischer und ökonomischer Sicht für die Renaturierung von Waldflächen von enormer Bedeutung ist, sind die Informationen zur Samenprod...

The natural regeneration of Salix caprea L. in disturbed forest areas is an important ecological phenomenon occurring during succession in temperate and boreal forests. Knowledge of the timing and extent of seed dispersal in goat willow is still rudimentary. We studied seed dispersal and genetic offspring relationships on five storm-disturbed fores...

The natural regeneration of Salix caprea L. in disturbed forest areas is an important ecological phenomenon occurring during succession in temperate and boreal forests. Knowledge of the timing and extent of seed dispersal in goat willow is still rudimentary. We studied seed dispersal and genetic offspring relationships on five storm-disturbed fores...

Mixed forests have been proposed as a tool for more flexible wood production that simultaneously improves conditions for biodiversity and various social demands. Therefore, regeneration of mixed forests has become an important topic of practical concern throughout the world. Here, we briefly review important ecological processes in the early phases...

Mixed forests have been proposed as a tool for more flexible wood production that simultaneously improves conditions for biodiversity and various social demands. Therefore, regeneration of mixed forests has become an important topic of practical concern throughout the world. Here, we briefly review important ecological processes in the early phases...

Fulltext Share Link (until December 15, 2018): https://authors.elsevier.com/c/1XybY57Eq07Kxc *** Abstract: Forests are under pressure from accelerating global change. To cope with the multiple challenges related to global change but also to further improve forest management we need a better understanding of (1) the linkages between drivers of ecosy...

Insekten sind essenzielle Bestandteile von Ökosystemen. Sie zersetzen unter anderem organische Materie, bestäuben einen Großteil der Pflanzen und dienen vielen anderen Tieren als Nahrungsgrundlage. So generieren sie viele Leistungen, wie die Bestäubung von Nutzpflanzen oder die biologische Schädlingskontrolle, die wir täglich verwenden und auf die...

Die Afrikanische Schweinepest ist auf Grund ihrer Ausbreitung im osteuropäischen Raum (Baltische Staaten, Polen, Tschechien) seit dem Winter 2017/2018 eine reale Bedrohung der einheimischen genetischen Ressourcen bei Schweinen in Deutschland. Die Tötung der Tierbestände von mittelbar und unmittelbar betroffenen Betrieben kann erhebliche Konsequenze...

Der rapide Verlust an biologischer Vielfalt in den Agrarlandschaften, der die Vielfalt der Habitate, die Vielfalt der Arten und die genetische Vielfalt innerhalb der Arten betrifft, ist mittlerweile wissenschaftlich gut belegt. Die Bundesrepublik Deutschland und die Europäische Union (EU) sind rechtlich verpflichtet, die natürlichen lebensgrundlage...

The global effort to rehabilitate and restore destroyed mangrove forests is unable to keep up with the high mangrove deforestation rates, which exceed the average pace of global deforestation. Although facilitation theory presents new possibilities for the restoration of heavily degraded mangrove sites, knowledge of tree–tree interactions in stress...

The ability of short-lived tree species such as birch, alder, willow, poplar and rowan to form even a short-term soil seed bank is discussed controversially in the literature. Soil seed banks are an important component of succession and regeneration in ecosystems. Following disturbance, buried viable seeds germinate and the seedlings that establish...

Strukturelemente auf Sturmwurfflächen werden häufig bei der Aufarbeitung des Sturmholzes entfernt. Diese Strukturelemente leisten jedoch einen entscheidenden Beitrag für den Eintrag von Baumsamen durch Vögel. Doch welche Strukturelemente erfüllen die Funktion als Sitz- und Rastplätze für Vögel besonders gut? Welchen Einfluss hat in diesem Zusammenh...

In 1996 a long-term trial was initiated by the German branch of IUFRO "Deutscher Verband Forstlicher Forschungsanstalten" (DVFFA, Silviculture Division) to move away from monocultures by artificially establishing European beech (Fagus sylvatica L.) underneath the canopy of pure Norway spruce stands (Picea abies (L.) Karst.). As sowing is considered...

Introduction: Knowledge about the regeneration ecology of silver birch (Betula pendula Roth), a key species of early woodland development stages, is fundamentally important to establish strategies for developing near-natural woodlands in post-mining landscapes. On 119 plots covering three former open cast lignite mining areas, we studied the effect...

At the moment experience with Tsuga heterophylla outside of the natural area is too scarce to give a well-grounded evaluation of its growth and ecological behaviour in landscapes within central Europe. Plantings close to general forestry praxis are present occasionally (with Thuringia as an example here) and give evidence for it being a highly prod...

An den unvermittelten Verlust großflächiger Nadelwälder durch wiederholt auftretende Sturmereignisse sind oftmals zeit- und kostenintensive Wiederaufforstungsmaßnahmen gebunden. Eine kostensparende Alternative bieten dagegen Vorwaldstrukturen von Pionierbaumarten, die sich infolge von Sukzessionsprozessen bei ausreichender Samenbaumanzahl natürlich...

The forests of North Mongolia are largely dominated either by larch (Larix sibirica Ledeb.) or birch (Betula platyphylla Sukaczev). The increasing demand for timber and firewood is currently met by removal of wood from these forest stands. Therefore, silvicultural approaches that account for both utilization and protection are needed. Thinning tria...

Black cherry (Prunus serotina EHRH.) is one of the most invasive plant species of Central Europe. Its presence is causing huge silvicultural and nature conservative challenges in the pine forests of northern Germany. The actions that have been taken in the past to reduce the massive dispersal were very labor and cost intensive. But what would in co...

Schlussfolgerungen: Biologische Vielfalt stellt ein öffentliches Gut dar, das in den heute vorherrschenden landwirtschaftlichen Produktionssystemen unehmend bedroht ist. Es ist die Aufgabe der Politik, durch Produktions- und Nutzungsauflagen oder Anreizsysteme den Rahmen für die Wirtschaftsbeteiligten so zu setzen, dass dieses öffentliche Gut gesch...

Quality of advanced planted European beech (Fagus sylvatica L.) areas of various sizes under Norway spruce (Picea abies (L.) Karst.) shelter Summary: Since the 1980s, single-layered conifer forests are being restored to natural mixed stands by introducing European beech (Fagus sylvatica L.) in keeping with the goal of sustainable forest management...

The understanding of habitat demands of single species needs an explicit habitat element approach which includes both the effect of intensity of the habitat element on the species population and the spatial effect of that habitat element in a given matrix (e.g., forest or water). An established tool in ecological research for this purpose is the po...

Abschlussbericht zum DBU-Forschungsvorhaben, Juli 2014

Conservation of Wild Apple in the Floodplains around Leipzig, Final Meeting 'AG Stadtwald Leipzig', Leipzig 12.05.2015

A major argument for incorporating deciduous tree species in coniferous forest stands is their role in the amelioration and stabilisation of biogeochemical cycles. Current forest management strategies in central Europe aim to increase the area of mixed stands. In order to formulate statements about the ecological effects of mixtures, studies at the...

A major argument for incorporating deciduous tree species in coniferous forest stands is their role in the amelioration and stabilisation of biogeochemical cycles. Current forest management strategies in central Europe aim to increase the area of mixed stands. In order to formulate statements about the ecological effects of mixtures, studies at the...

Nach wie vor steht auf großer Fläche der Landeswälder Thüringens und Sachsens ein Waldumbau von Nadelholz-Reinbeständen auf typischen Buchenstandorten bevor. Mit Blick auf die Ergebnisse einer Untersuchung zur " Qualität von Buchen-Voranbauten nach Schirmverlust " ist die bisherige Praxis des Buchenvoranbaus zu überdenken. D ie Ergebnisse des vorge...

Geht der Fichtenschirm in vorangebauten Beständen durch Sturm verloren, so ändern sich die Wuchsbedingungen der Buchenverjüngung drastisch. Die Auswirkungen für die Qualität des Buchenvoranbaus wurden auf mehreren Sturmwurffl ächen des Orkans " Kyrill " im Thüringer Wald und im sächsischen Erzgebirge untersucht. Wie die Ergebnisse zeigen, geht eine...

• Flächendeckende Unterschicht von Spätblühender Traubenkirsche in Kiefernbeständen entspricht nicht dem Ziel einer Renaturierung • Schattentolerante Klimaxbaumarten können Spätblühende Traubenkirsche unterwandern und später ausdunkeln • Spätblühende Traubenkirsche verhindert ihrerseits Ausbreitung von Reitgras • Schalenwild muss reguliert werden

Storm events, insect calamities or snow breaks are causes of large-scale disturbances in Norway spruce and Scots pine forests in Germany. In most cases the damaged forest are reforested after such events. However natural disturbances provide the opportunity to convert these unstable coniferous forests to stable, unevenly-aged mixed stands. Due to t...

In Germany, the conversion of unstable non-natural Norway spruce forests to near-natural mixed forests has been in progress for over 2 decades. Here European beech (Fagus sylvatica L.) plays a key role. European beech has often been planted under the shelter of Norway spruce with the aim of producing quality timber. This investigation examines the...

Biological legacies are important for ecosystem recovery following disturbance as demonstrated by studies in the northern hemisphere. Southern bog forests dominated by the conifer Pilgerodendron uviferum in Northern Patagonia are a typical case of an ecosystem with low resilience to disturbance by fire, which kills most trees and seeds, on which th...

The issue of rapid change in environmental conditions under which ecosystem processes and human interventions will take place in the future is relatively new to forestry, whereas the provision of ecosystem services, e.g., timber or fresh water, is at the very heart of the original concept of forest management. Forest managers have developed ambitio...

The study focused on the growth of four-year-old sown silver fir (Abies alba MILL.) seedlings in old Norway spruce forests (Picea abies L.) in the Ore Mountains, Saxony (Marienberg and Eibenstock forest districts). Sites of different altitudes and aspects were included in the investigation, as well as different dominant ground cover vegetation comp...

In Germany, the conversion of unstable non-natural Norway spruce forests to near-natural mixed forests has been in progress for over 2 decades. Here European beech (Fagus sylvatica L.) plays a key role. European beech has often been planted under the shelter of Norway spruce with the aim of producing quality timber. This investigation examines the...

The study focused on the growth of four-year-old sown silver fir (Abies alba Mill.) seedlings in old Norway spruce forests (Picea abies L.) in the Ore Mountains, Saxony (Marienberg and Eibenstock forest districts). Sites of different altitudes and aspects were included in the investigation (Tab. 2), as well as different dominant ground cover vegeta...

Management strategies to control invasive species need information about dispersal distances to predict establishment potential. Fraxinus pennsylvanica is a North American anemochorous tree species that is invasive in many Central European floodplain forests. To predict seed-dispersal potential, the stochastic model WaldStat was used, which enables...