Perspectieven voor hoogveenherstel in Nederland

Het hoogveenareaal in Nederland is door turfwinning, boekweitbrandcultuur en verdroging gedecimeerd en bestaat grotendeels uit ontwaterde en vergraven hoogveenrestanten, die het karakter van een hoogveensysteem nagenoeg geheel hebben verloren. In de hoogveenrestanten treedt een ongewenste dominantie op van Pijpenstrootje, Berk en Slank veenmos. Al decennia lang worden vernattingsmaatregelen uitgevoerd om delen van het sterk gedegradeerde hoogveenlandschap te herstellen. Hoogveenvorming komt echter op slechts enkele locaties op gang. Daarom is in het kader van het OBN onderzoek gestart naar de perspectieven voor hoogveenherstel in Nederland. Centrale vragen daarbij zijn of bij de huidige hoge atmosferische stikstofdepositie hoogveenherstel mogelijk is en wat de randvoorwaarden zijn voor herstel van de karakteristieke flora en fauna

Preadvies voor herstel en ontwikkeling van vochtige bossen op de pleistocene zandgronden

Dit preadvies geeft inzicht in de sleutelprocessen en factoren die bepalend zijn voor behoud en ontwikkeling van natuurwaarden in vochtige bossen. Ook zijn de mogelijkheden in kaart gebracht om via herstelbeheer, regulier beheer en omvormingsbeheer te komen tot herstel van natuurwaarden in het geval sleutelprocessen en factoren verminderd of niet meer werkzaam of aanwezig zijn

Lessons learned from rapid environmental risk assessments for prioritization of alien species using expert panels

Limiting the spread and impacts of invasive alien species (IAS) on biodiversity and ecosystems has become a goal of global, regional and national biodiversity policies. Evidence based management of IAS requires support by risk assessments, which are often based on expert judgment. We developed a tool to prioritize potentially new IAS based on their ecological risks, socio-economic impact and feasibility of management using multidisciplinary expert panels. Nine expert panels reviewed scientific studies, grey literature and expert knowledge for 152 species. The quality assessment of available knowledge revealed a lack of peer-reviewed data and high dependency on best professional judgments, especially for impacts on ecosystem services and feasibility of management. Expert consultation is crucial for conducting and validating rapid assessments of alien species. There is still a lack of attention for systematic and methodologically sound assessment of impacts on ecosystem services and weighting negative and positive effects of alien species.Peer reviewe

UV and EUV Instruments

We describe telescopes and instruments that were developed and used for astronomical research in the ultraviolet (UV) and extreme ultraviolet (EUV) regions of the electromagnetic spectrum. The wavelength ranges covered by these bands are not uniquely defined. We use the following convention here: The EUV and UV span the regions ~100-912 and 912-3000 Angstroem respectively. The limitation between both ranges is a natural choice, because the hydrogen Lyman absorption edge is located at 912 Angstroem. At smaller wavelengths, astronomical sources are strongly absorbed by the interstellar medium. It also marks a technical limit, because telescopes and instruments are of different design. In the EUV range, the technology is strongly related to that utilized in X-ray astronomy, while in the UV range the instruments in many cases have their roots in optical astronomy. We will, therefore, describe the UV and EUV instruments in appropriate conciseness and refer to the respective chapters of this volume for more technical details.Comment: To appear in: Landolt-Boernstein, New Series VI/4A, Astronomy, Astrophysics, and Cosmology; Instruments and Methods, ed. J.E. Truemper, Springer-Verlag, Berlin, 201

Perspectieven voor hoogveenherstel in Nederland

Contains fulltext : 32840.pdf (publisher's version ) (Open Access

New records of Odonata from Estonia, with notes on breeding in the Baltic sea and on species assemblages of raised bog systems.

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Changes in macroinvertebrate richness and diverity following large scale rewetting measures in a heterogeneous bog landscape.

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Lasodiamesa gracillis (Chironomidae: Podonominae) new for the Dutch fauna.

Contains fulltext : 121874.pdf (Publisher’s version ) (Open Access