Winfried Riek

To cope with the challenges in forest management that are contemporarily caused by climate change, data on current chemical and physical soil properties are more and more necessary. For this purpose, we present a further amalgam of depth functions and SCORPAN modelling to provide data at arbitrary depth layers. In this concept, regionalisation is split up into the modelling of plot totals and the estimation of vertical distributions. The intended benefits by splitting up are: consistency between estimates on plot level and depth layer level, avoidance of artificial depth gradients, straightforward interpretation of covariates in the sense of pedogenetic processes, and circumnavigation of the propagation of uncertainties associated with separation between horizons during field sampling. The methodology was tailored to the circumstances within the north-eastern lowlands and the utilisation of current inventory data of the National Forest Soil Inventory (NFSI) in Brandenburg (Germany)....

... Wasserhaushalt und Dickenwachstum von Kiefern in Abhangigkeit des GrundwasserflurabstandesGerd Wessolek'), Winfried Rick'), Angela yon Luhrte2) und Michael Facklam') 1) Institut fur Okologie/FG Bodenkunde, Technische Universitat Berlin, Salzufer 12, D-10587 Berlin ...

ABSTRACT Between the first and second national forest soil inventory in the northeastern German lowlands a significant soil acidification took place with regionally varying intensity. It manifests itself in a reduced base saturation in the whole rooting zone. This applies to the base cations magnesium and calcium. For potassium, however, no significant changes were detected. The acidification dynamic is the strongest in the southern part of Brandenburg. The specific immission situation in this region during the past four decades explains this. Particularly in southern Brandenburg high dust depositions (fly ashes from brown coal-fired power stations) buffered the acid components and enriched the soil with base cations in the 1970s and 1980s. Since the reduction of these atmospheric depositions, the bases were obviously totally incorporated in the biomass or leached out with seepage water. Currently, the majority of the forest sites in Mecklenburg-Vorpommern and Brandenburg are poor in basic nutrient elements (Ca, Mg, K). Especially the element magnesium is assumed to be lacking. This paper presents an assessment of the long-term availability of the nutrients Ca, Mg und K on the basis of calculated nutrient balances for various forest management scenarios (e.g. full-tree harvest). The results show that the sustainable supply is critical especially for intensive forest use on numerous sites.

ABSTRACT Es wurde ein Ansatz zur Regionalisierung der bodenkundlichen Basiskennwerte Skelettanteil und Bodenart des Feinbodens für die Waldfläche Brandenburgs auf Grundlage der forstlichen Standortskarte entwickelt. Die Regionalisierung gliedert sich in drei aufeinander aufbauende Schritte: räumliche Disaggregierung in Gebieten mit unklarer Zuordnung der Standortsformen, Prognose forstlicher Standortsformen für bisher nicht kartierte Gebiete sowie Ableitung von Tiefenprofilen zu Bodenart und Grobbodengehalt für die Standortsformen. In der forstlichen Standortskartierung werden im nordostdeutschen Tiefland gegenwärtig ca. 970 unterschiedliche Feinbodenformen unterschieden, von denen bisher 544 in Brandenburg kartiert werden konnten. Für sämtliche der 970 Feinbodenformen wurden Profilabfolgen zu Bodenart, Skelett- und CaCO3-Gehalten abgeleitet.

1)Institut fur Okologie / FG Bodenkunde, TU Berlin, Salzufer 12, D-10587 Berlin; IIZALF, Institut fur Bodenforschung, Dr. Zinn-Weg, D-16225 Eberswalde-Finow ... Die vorliegende Auswertung basiert auf mehr als 6MXl Aodenhorizont-daten, die den Labordatenbanken der ...

For the determination of element stocks the bulk density of the fine earth (<2mm) respectively the fine earth stock must be known. Especially in the case of parent materials with a high content of coarse fragments, the exact determination of the amount of fine earth is problematic. Against this background a combined approach is presented, which is based on the combination of i) (mini-)sample rings , ii) a large non-volume-based soil sample (shovel sample) and iii) estimation of coarse fraction at the soil profile. The method was included in the Handbuch Forstliche Analytik and the ICP forests Manual. Für die Ermittlung von Elementvorräten ist die Kenntnis des Feinbodenvorrates notwendig. Besonders im Falle von Ausgangsmaterialien mit hohem Grobbodenanteil ist die Ermittlung der Feinbodenmenge problematisch, da mit der gängigen Stechzylinderbeprobung der Grobbodenanteil oft nicht repräsentativ erfasst werden kann, Volumenersatzverfahren für Serienuntersuchungen zu aufwändig und Sc...