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  • 1
    Monograph available for loan
    Monograph available for loan
    New York, NY [u.a.] : Springer
    Call number: PIK N 630-95-0262
    Type of Medium: Monograph available for loan
    Pages: XII, 159 S. , Ill., graph. Darst., Kt.
    Edition: 2. ed., corr. 2. printing
    ISBN: 0387945024 , 0-387-94351-X , 3-540-94351-X
    Branch Library: PIK Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Springer
    Call number: PIK N 630-92-0201
    Type of Medium: Monograph available for loan
    Pages: XI, 253 S. : Ill., graph. Darst.
    ISBN: 0387903216
    Branch Library: PIK Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Chapman and Hall
    Call number: PIK M 370-96-0431
    Type of Medium: Monograph available for loan
    Pages: 153 p.
    ISBN: 0412048116
    Branch Library: PIK Library
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  • 4
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Materiel Command, Cold Regions Research & Engineering Laboratory
    Associated volumes
    Call number: ZSP-202-239
    In: Research report
    Description / Table of Contents: CONTENTS: Preface. - Abstract. - Introduction. - Climate. - Geology. - Methods and procedures. - General description of lakes studied. - Circulation and mixing in lakes. - Heat flow. - Light transmission. - Measurements of primary productivity. - Chemical characteristics. - Summary. - Literature cited. - Appendix A: Limnological measurements.
    Description / Table of Contents: Chemical, physical and biological measurements were made in about 40 lakes and 9 other aquatic habitats in interior Alaska, primarily in the Tanana and Yukon River drainages. The lakes were classified according to circulation patterns, inferred from temperature and chemical profiles, into mononictic (22 to 24 lakes), dimictic (13 to 15 lakes) and meromictic (3 lakes) types. The lake waters were generally very alkaline in both the Yukon and Tanana drainages. Calcium, magnesium, sodium and bicarbonate ions dominated the water chemistry. In several lakes concentrations of sulfate and magnesium exceeded the limits suggested for potable water. The chemistry of surface water from various springs and the Arctic Coastal Plain was contrasted with that of lakes in interior Alaska. Sediment temperatures demonstrated a significant feature of unfrozen lakes in cold regions: a considerable net amount of heat flows from the water to the underlying sediments annually. Light penetration into the lakes varied widely (extinction coefficients of 0.46/m to 3.57/m). A relatively high rate of carbon fixation (764 mg C/m^3 day) was measured in C^14 experiments. It was inferred that nutrients were the more probable limiting factor for primary production in these lakes.
    Type of Medium: Series available for loan
    Pages: V, 41 S. : Ill.
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 239
    Branch Library: AWI Library
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  • 5
    Monograph available for loan
    Monograph available for loan
    Oldendorf : Ecol. Inst.
    Call number: AWI P1-01-0266
    Type of Medium: Monograph available for loan
    Pages: 166 S. : graph. Darst.
    Series Statement: Exellence in Ecology 3
    Branch Library: AWI Library
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  • 6
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Springer
    Call number: M 93.0501 ; AWI G2-94-0155
    Description / Table of Contents: Limnological Analyses, a classic textbook now in its second, thoroughly updated edition, consists of a series of carefully designed and tested field and laboratory exercises representing the full scope of limnology. It provides the student with a solid foundation in this complex multidisciplinary field of ecology covering the physical, chemical, and biological characteristics of standing and running waters. The book illustrates accepted standard methods as well as modern metabolic and experimental approaches and their research applications. Step-by-step exercises cover topics such as major physical components of lakes and streams, important mineral nutrients, cycling of organic matter, benthic fauna, primary productivity of phytoplankton, quantitative methods in biota analysis, diurnal changes, experimental manipulation of model ecosystems, effects of sewage outfall and other human activites, whole ecosystem and community analyses. Each exercise is preceded by an introductory section and concludes with questions for the student and a selection of suggested readings.
    Type of Medium: Monograph available for loan
    Pages: XIII, 391 S.
    Edition: 2nd ed.
    ISBN: 0387973311
    Classification: A.3.12.
    Language: English
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: AWI Library
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  • 7
    ISSN: 1435-0629
    Keywords: Key words: biogeochemistry; calcium; carbon; forest ecology; Hubbard Brook; nitrogen; soil chemistry; soil solution; stream chemistry; weathering.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: ABSTRACT Chemical changes along headwater streams at the Hubbard Brook Experimental Forest in New Hampshire suggest that important differences exist in biogeochemical cycles along an altitudinal gradient within small watershed ecosystems. Using data collected during the period 1982–92, we have constructed element budgets [Ca, Mg, K, Na, Si, Al, dissolved organic carbon (DOC), S, and N] for three subcatchments within watershed 6, a forested watershed last logged around 1917–20. The biogeochemistry of the high-elevation spruce-fir–white birch subcatchment was dominated by processes involving naturally occuring organic compounds. Stream water and soil solutions in this zone had elevated concentrations of organic acidity, DOC, and organically bound monomeric aluminum (Alo), relative to lower-elevation sites. The middle-elevation subcatchment, dominated by hardwood vegetation, had the greatest net production of inorganic-monomeric aluminum (Ali), and exhibited net immobilization of DOC and Alo. The low-elevation subcatchment, also characterized by deciduous vegetation, had the highest rates of net production of base cations (Ca2+, Mg2+, K+, Na+) among the subcatchments. Living biomass of trees declined slightly in the spruce-fir–white birch subcatchment during the study period, remained constant in the middle-elevation zone, and increased by 5% in the low-elevation subcatchment. Coupling the corresponding changes in biomass nutrient pools with the geochemical patterns, we observed up to 15-fold differences in the net production of Ca, Mg, K, Na, and Si in soils of the three subcatchments within this 13.2-ha watershed. Release of Ca, Na, and dissolved Si in the highest-elevation subcatchment could be explained by the congruent dissolution of 185 mol ha−1 y−1 of plagioclase feldspar. The rate of plagioclase weathering, based on the net output of Na, increased downslope to 189 and 435 mol ha−1 y−1 in the middle-elevation and low-elevation subcatchments, respectively. However, the dissolution of feldspar in the hardwood subcatchments could account for only 26%–37% of the observed net Ca output. The loss of Ca from soil exchange sites and organic matter is the most likely source of the unexplained net export. Furthermore, this depletion appears to be occurring most rapidly in the lower half of watershed 6. The small watersheds at the Hubbard Brook Experimental Forest occupy a soil catena in which soil depth and soil-water contact time increase downslope. By influencing hydrologic flowpaths and acid neutralization processes, these factors exert an important influence on biogeochemical fluxes within small watersheds, but their influence on forest vigor is less clear. Our results illustrate the sensitivity of watershed-level studies to spatial scale. However, it appears that much of the variation in element fluxes occurs in the first 10–20 ha of drainage area.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We selected records from high-quality precipitation monitoring stations in North America and Europe with 10 yr of continuous data, and where collection andanalytical methods have been kept consistent over time (Fig. 1). We modelled trends in annual volume-weighted mean (VWM) ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 345 (1990), S. 798-800 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The depletion of calcium in forest ecosystems of the northeastern USA is thought to be a consequence of acidic deposition and to be at present restricting the recovery of forest and aquatic systems now that acidic deposition itself is declining. This depletion of calcium has been inferred from ...
    Type of Medium: Electronic Resource
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