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Subject: Short rotation coppices ×

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    Neues Prinzip eines Mähhackers für Kurzumtriebsplantagen
    (Darmstadt : KTBL, 2012) Ehlert, Detlef; Pecenka, Ralf; Wiehe, Jens
    Gegenwärtig auf dem Markt verfügbare Mähhacker für Kurzumtriebsplantagen (KUPs) auf Basis von Feldhäckslern haben Nachteile hinsichtlich der Maschinenmasse und der hohen Investitionskosten. Traktorgebundene Geräte sind bisher nur begrenzt leistungsfähig. Um einen Beitrag zur Erweiterung des Angebots kostengünstiger Erntetechnik zu leisten, wurde ein neuartiges Prinzip eines traktorbasierten Mähhackers für einreihige KUPs entwickelt, der sich durch einen einfachen Aufbau und ein breites Einsatzspektrum auszeichnet.
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    Establishment of a Laboratory Scale Set-Up with Controlled Temperature and High Humidity to Investigate Dry Matter Losses of Wood Chips from Poplar during Storage
    (Basel : MDPI, 2022) Hernandez-Estrada, Albert; Pecenka, Ralf; Dumfort, Sabrina; Ascher-Jenull, Judith; Lenz, Hannes; Idler, Christine; Hoffmann, Thomas
    The aim of this work was to improve the understanding of dry matter losses (DML) that occur in wood chips during the initial phase of storage in outdoor piles. For this purpose, a laboratory scale storage chamber was developed and investigated regarding its ability to recreate the conditions that chips undergo during the initial phase of outdoor storage. Three trials with poplar Max-4 (Populus maximowiczii Henry  Populus nigra L.) chips were performed for 6–10 weeks in the storage chamber under controlled temperature and assisted humidity. Two different setups were investigated to maintain a high relative humidity (RH) inside the storage chamber; one using water containers, and one assisted with a humidifier. Moisture content (MC) and DML of the chips were measured at different storage times to evaluate their storage behaviour in the chamber. Additionally, microbiological analyses of the culturable fraction of saproxylic microbiota were performed, with a focus on mesophilic fungi, but discriminating also xerophilic fungi, and mesophilic bacteria, with focus on actinobacteria, in two trials, to gain a view on the poplar wood chip-inhabiting microorganisms as a function of storage conditions (moisture, temperature) and time. Results show that DML up to 8.8–13.7% occurred in the chips within 6–10 storage weeks. The maximum DML were reached in the trial using the humidifier, which seemed a suitable technique to keep a high RH in the testing chamber, and thus, to analyse the wood chips in conditions comparable to those in outdoor piles during the initial storage phase.