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  • 1
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    (Table 2) Geochemistry at DSDP Hole 86-581
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 86-581; Aluminium oxide; Calcium oxide; Carbon dioxide; Cerium; Chromium; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Dysprosium; Erbium; Europium; Glomar Challenger; Iron oxide, Fe2O3; Iron oxide, FeO; Leg86; Magnesium number; Magnesium oxide; Manganese oxide; Mass spectrometry; Neodymium; Nickel; Phosphorus pentoxide; Potassium oxide; Rubidium; Samarium; Sample, optional label/labor no; Sample code/label; Silicon dioxide; Sodium oxide; Strontium; Titanium dioxide; Water in rock; X-ray fluorescence (XRF); Ytterbium; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 299 data points
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  • 2
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    (Table 1) Petrography at DSDP Hole 86-581
    PANGAEA
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    Publication Date: 2023-06-27
    Keywords: 86-581; Deep Sea Drilling Project; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg86; Sample, optional label/labor no; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 39 data points
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  • 3
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    Petrology and geochemistry of basalts at DSDP Hole 86-581
    PANGAEA
    In:  Supplement to: Fountain, John C; Jacobi, Robert D; Fahey, Timothy J (1985): Petrology and geochemistry of basalts from Deep Sea Drilling Project Leg 86, Site 581. In: Heath GR; Burckle LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 86, 691-697, https://doi.org/10.2973/dsdp.proc.86.132.1985
    Details
    Publication Date: 2023-06-27
    Description: Approximately 5 m of aphyric to sparsely phyric basalt was recovered from Hole 581, the only hole on Leg 86 where basement was cored. The occurrence of samples with altered glassy rinds indicates that at least three cooling units (pillows or thin flows) were sampled. The samples were moderately to intensely altered; groundmass crystals are generally fresh, but all glass is altered. Alteration is greatest in vesicular samples, but most of the samples have fractures filled with iron oxyhydroxide, clay, and/or calcite. All 13 samples analyzed are moderately fractionated aluminous N-type mid-ocean ridge basalts. The samples can be divided into two groups based on TiO2 and FeO contents. The least-evolved group may be derived from a more primitive mid-ocean ridge basalt by the crystallization of 18% plagioclase, 24% clinopyroxene, and 3% olivine. The more evolved group may be derived from the first group by the fractionation of 18% plagioclase, 11% clinopyroxene, and 3% olivine. However, higher Ce/Yb ratios in the more evolved group cannot be produced by fractionation and thus we must invoke a more complex process such as dynamic melting to relate the two groups to a common source.
    Keywords: 86-581; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg86
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
    Electronic Resource
    Electronic Resource
    Mycorrhizae and forest ecosystems (1992)
    Springer
    Mycorrhiza 1 (1992), S. 83-89 
    Details
    ISSN: 1432-1890
    Keywords: Fine roots ; Physiology ; Morphology ; Demography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mycorrhizae play an important role in regulating patterns of energy and nutrient flux in terrestrial ecosystems. To conceptualize this role I develop the theory behind a simple index of the efficiency of soil resource acquisition by plant root systems (E). The morphological, physiological and demographic characteristics of mycorrhizae that define E appear to vary with environment and with plant community composition. This theory is elaborated with examples drawn from forest ecology literature. Some inconsistencies among observations of fine root dynamics are particularly revealing: (1) belowground carbon allocation vs soil fertility; (2) causes of root mortality; (3) root longevity vs decomposition rates. A comprehensive theory of mycorrhizal and ecosystem dynamics must await resolution of these inconsistencies and better quantitative information on mycorrhizal features affecting E.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206141
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  • 5
    Electronic Resource
    Electronic Resource
    Ecology (communication arising) Mycorrhizal weathering in base-poor forests (2003)
    [s.l.] : Nature Publishing Group
    Nature 423 (2003), S. 824-824 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Blum et al. reply We identified apatite as an important reservoir of calcium in the soil horizons termed Bs and C at Hubbard Brook experimental forest (HBEF) and suggested that it could exceed the size of the soil-exchange pool. Apatite has high calcium-to-strontium (Ca/Sr) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/423824a
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  • 6
    Electronic Resource
    Electronic Resource
    Mycorrhizal weathering of apatite as an important calcium source in base-poor forest ecosystems (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 417 (2002), S. 729-731 
    Details
    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
    URL: http://dx.doi.org/10.1038/nature00793
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  • 7
    Electronic Resource
    Electronic Resource
    Environmental control of fine root dynamics in a northern hardwood forest (2003)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 9 (2003), S. 0 
    Details
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Understanding how exogenous and endogenous factors control the distribution, production and mortality of fine roots is fundamental to assessing the implications of global change, yet our knowledge of control over fine root dynamics remains rudimentary. To improve understanding of these processes, the present study developed regression relationships between environmental variables and fine root dynamics within a northern hardwood forest in New Hampshire, USA, which was experimentally manipulated with a snow removal treatment. Fine roots (〈 1 mm diameter) were observed using minirhizotrons for 2 years in sugar maple and yellow birch stands and analyzed in relation to temperature, water and nutrient availability. Fine root dynamics at this site fluctuated seasonally, with growth and mortality peaking during warmer months. Monthly fine root production was strongly associated with mean monthly air temperature and neither soil moisture nor nutrient availability added additional predictive power to this relationship. This relationship exhibited a seasonal temperature hysteresis, which was altered by snow removal treatment. These results suggest that both exogenous and endogenous cues may be important in controlling fine root growth in this system. Proportional fine root mortality was directly associated with mean monthly soil temperature, and proportional fine root mortality during the over-winter interval was strongly related to whether the soil froze. The strong relationship between fine root production and air temperature reported herein contrasts with findings from some hardwood forest sites and indicates that controls on fine root dynamics vary geographically. Future research must more clearly distinguish between endogenous and exogenous control over fine root dynamics in various ecosystems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2486.2003.00622.x
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  • 8
    Electronic Resource
    Electronic Resource
    Patterns of rhizosphere carbon flux in sugar maple (Acer saccharum) and yellow birch (Betula allegheniensis) saplings (2005)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 11 (2005), S. 0 
    Details
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Despite its importance in the terrestrial C cycle rhizosphere carbon flux (RCF) has rarely been measured for intact root–soil systems. We measured RCF for 8-year-old saplings of sugar maple (Acer saccharum) and yellow birch (Betula allegheniensis) collected from the Hubbard Brook Experimental Forest (HBEF), NH and transplanted into pots with native soil horizons intact. Five saplings of each species were pulse labeled with 13CO2 at ambient CO2 concentrations for 4–6 h, and the 13C label was chased through rhizosphere and bulk soil pools in organic and mineral horizons for 7 days. We hypothesized yellow birch roots would supply more labile C to the rhizosphere than sugar maple roots based on the presumed greater C requirements of ectomycorrhizal roots. We observed appearance of the label in rhizosphere soil of both species within the first 24 h, and a striking difference between species in the timing of 13C release to soil. In sugar maple, peak concentration of the label appeared 1 day after labeling and declined over time whereas in birch the label increased in concentration over the 7-day chase period. The sum of root and rhizomicrobial respiration in the pots was 19% and 26% of total soil respiration in sugar maple and yellow birch, respectively. Our estimate of the total amount of RCF released by roots was 6.9–7.1% of assimilated C in sugar maple and 11.2–13.0% of assimilated C in yellow birch. These fluxes extrapolate to 55–57 and 90–104 g C m−2 yr−1 from sugar maple and yellow birch roots, respectively. These results suggest RCF from both arbuscular mycorrhizal and ectomycorrhizal roots represents a substantial flux of C to soil in northern hardwood forests with important implications for soil microbial activity, nutrient availability and C storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2486.2005.00959.x
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  • 9
    Electronic Resource
    Electronic Resource
    Management of Sedimentation in Tropical Watersheds (1999)
    Springer
    Environmental management 23 (1999), S. 441-452 
    Details
    ISSN: 1432-1009
    Keywords: KEY WORDS: Tropical watersheds; Sedimentation; Reservoirs; Erosion control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002679900199
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  • 10
    Electronic Resource
    Electronic Resource
    Soil-plant interactions in a neotropical mangrove forest: iron, phosphorus and sulfur dynamics (1998)
    Springer
    Oecologia 115 (1998), S. 553-563 
    Details
    ISSN: 1432-1939
    Keywords: Key words Mangrove species zonation ; Sulfate reduction ; Pyrite formation ; Phosphorus ; Decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We examined soil porewater concentrations of sulfate, alkalinity, phosphorus, nitrogen, and dissolved organic carbon and solid phase concentrations of pyrite in relation to mangrove species distributions along a 3.1-km-long transect that traversed a 47.1-km2 mangrove forest in the Dominican Republic. Iron, phosphorus, and sulfur dynamics are closely coupled to the activity of sulfate-reducing bacteria, the primary decomposers in anoxic soils of mangrove ecosystems. Patterns in the chemistry data suggested that sulfate reduction rates and storage of reduced sulfur were greater in the inland basin forest dominated by Laguncularia racemosa than the Rhizophora mangle dominated forest of the lower tidal region. The distribution of Laguncularia was significantly correlated with concentrations of total phosphorus (r= 0.99) and dissolved organic carbon (r= 0.86), alkalinity (r= 0.60), and the extent of sulfate depletion (r= 0.77) in the soil porewater and soil pyrite concentrations (r= 0.72) across the tidal gradient. Leaf tissue chemistry of Laguncularia was characterized by lower C:N and C:P ratios that could fuel the higher rates of decomposition in the Laguncularia-dominated forest. We suggest that a plant-soil-microbial feedback contributes to the spatial patterning of vegetation and soil variables across the intertidal zone of many mangrove forest communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050553
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