ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Agricultural nitrogen model: A tool for regional environmental management (1983)
    Springer
    Environmental management 7 (1983), S. 177-187 
    Details
    ISSN: 1432-1009
    Keywords: Nitrogen ; Model ; Agriculture ; Mass balance ; Ground-water ; Denitrification ; Immobilization ; Dry deposition ; Nitrogen fixation ; Nitrate ; Florida
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A detailed nitrogen budget was devised for agricultural activities in the Florida peninsula, based on routine data published by state agricultural agencies. The model demonstrates that important unmonitored fluxes of nitrogen can often be calculated by mass balance on individual model compartments, and that the reasonability of poorly quantified fluxes can be assessed. The results of such models can be very useful in designing and assessing the results of field experiments and in prioritizing environmental monitoring programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01867279
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Application of nutrient loading models to the analysis of trophic conditions in Lake Okeechobee, Florida (1984)
    Springer
    Environmental management 8 (1984), S. 109-120 
    Details
    ISSN: 1432-1009
    Keywords: Eutrophication ; Nitrogen loading ; Phosphorus loading ; Nutrient management ; Input-output models ; Lake Okeechobee, Florida
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Lake Okeechobee (surface area = 1830 km2, mean depth = 3.5 m), the largest lake in Florida, is eutrophic and has nitrogen and phosphorus loading rates in excess of nearly all established criteria. The lake is not homogeneous regarding trophic conditions, and spatial and temporal variations occur regarding nutrient limitation. Nonetheless, phosphorus loading rate and trophic state data fit reasonably well to various input-output models developed for temperate lakes. Modification of the models by regression analysis to fit data for Florida lakes resulted in improved predictions for most parameters. Analysis of nutrient management alternatives for the lake indicates that a 75% reduction of phosphorus loading from the largest source (the Taylor Creek-Nubbins Slough watershed) would reduce the average chlorophyll a concentration by less than 20%. Complete elimination of inputs from the largest nitrogen source (the Everglades Agricultural Area) would decrease the average nitrogen concentration in the lake by about 20%. Limitations of nutrient inputoutput models regarding analysis of trophic conditions and management alternatives for the lake are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01866931
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Modern and historic accumulation rates of phosphorus in Lake Okeechobee, Florida (1998)
    Springer
    Journal of paleolimnology 20 (1998), S. 31-46 
    Details
    ISSN: 1573-0417
    Keywords: phosphorus ; Lake Okeechobee ; lead-210 dating ; eutrophication ; phosphorus loading
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Phosphorus accumulation rates in depositional zone sediments of Lake Okeechobee were determined in 11 mud-zone cores and two peat-zone cores dated by 210Pb. Although difficulties were encountered in interpreting 210Pb data from some sites, reliable dating of sediments from the mud zone of this shallow lake is possible. Sediment accumulation rates in this zone have increased during the present century by an average of about twofold, and accumulation of organic sediments in the lake during pre-settlement times apparently was much slower than during the past century. Concentrations of all forms of sedimentary P but especially nonapatite inorganic-P and organic-P also have increased since pre-settlement times and especially since about 1940. Annual P accumulation rates in the lake's sediments have increased about fourfold during the 1900s, with most of the increase occurring in the past 40–50 years. The recent accumulation rate of sedimentary P (past ~ 10 years) agrees within a factor of 1.5 with the net retention of P in the lake calculated from published input-output mass balances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007939714301
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The limnology of selected Guatemalan Lakes (1974)
    Springer
    Hydrobiologia 45 (1974), S. 467-487 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During the summer of 1969, fourteen Guatemalan lakes were sampled, including eight in the lowland northern province of Peten and six in southern Guatemala. The majority of the Peten lakes exhibited thermal stratification and hypolimnetic oxygen depletion. In most cases, pollution tolerant bottom forms were found. Algal species and numbers in general corresponded to a subjective estimate of the degree of nutrient input to the lakes. Lyngbya was usually the organism found when blooms were noted. The lakes in the Peten are predominately calcium bicarbonate and calcium sulfate lakes, but magnesium is also high in several of them. The southern lakes were chemically more variable, with sodium being more important than in the northern lakes. Most of the southern lakes also exhibited thermal stratification and hypolimnetic oxygen depletion, with the flora and fauna dependent upon oxygen and nutrient conditions. The authors conclude that different criteria than those used to assess the trophic status of temperate lakes are needed to classify tropical lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012032
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Seasonal patterns of mercury species in water and plankton from softwater lakes in Northeastern Minnesota (1998)
    Springer
    Biogeochemistry 40 (1998), S. 147-162 
    Details
    ISSN: 1573-515X
    Keywords: ANC ; DOC ; mercury ; labile methylmercury ; water ; zooplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Twelve softwater lakes in NE Minnesota were sampled in spring, summer, and fall of 1992 and 1993 for labile (unextracted) methyl-Hg, total (extracted) methyl-Hg, and total Hg in lake water and net plankton (≥300 µm). The lakes are small (5.6–56 ha), low productivity, headwater drainage or seepage lakes. They are acid-sensitive (ANC ≤200 µeq/L) but not low pH lakes (average pH 6.6). The lakes ranged in color from 8.5 to 70 PCU. Statistical analysis of the water chemistry variables and mercury species support the conclusion that these were a homogeneous set of lakes; therefore, seasonality of mercury forms was analyzed on combined (mean) data from the 12 lakes. Methyl-Hg in water declined throughout the growing season. HgT also declined sharply from spring to summer but increased again in the fall. In contrast to the methyl-Hg and Hg in water, concentrations in plankton were at the lowest levels in spring and rose to higher levels in summer. The mass of mercury in plankton increased from spring to fall, as did the methyl-Hg fraction, which increased from 20% of HgT in spring to 52% in autumn. Bioaccumulation factors (BAF) for methyl-Hg in net plankton increased over the growing season. Overall, log BAF for HgT in net plankton (wet wt.) was 4.45. Log BAF for methyl-Hg in plankton was 4.90 to 5.43 depending on the analytical form of methyl-Hg in water (labile or total). Seasonal patterns of methyl-Hg and HgT did not covary in water, but did covary in plankton. These results support the conclusion that measurement of Hg in water is not adequate in itself to determine the amount of bioavailable Hg (i.e., methyl-Hg) in a lake. Labile (unextracted) methyl-Hg could be a useful measurement of bioavailable Hg. Labile methyl-Hg exhibits the same seasonal patterns as total methyl-Hg, but does not require the extraction steps necessary for measuring total methyl-Hg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005967413585
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Climate confounds detection of chemical trends related to acid deposition in upper Midwest lakes in the USA (1995)
    Springer
    Water, air & soil pollution 85 (1995), S. 1575-1580 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Between 1983–94, as acid deposition rates declined, SO4 2− concentrations decreased in 18 of 28 lakes monitored by the upper Midwest LTM program. The expected recovery of ANC and pH was less common, however. Differences in climate may account for divergent trend patterns across the region. Only in Minnesota, where climatic shifts were less pronounced, did we observe a general pattern of increasing lake ANC and pH accompanying declines in SO4 2−. In contrast, the widespread negative trends in lake SO4 2− in the upper Michigan lakes were generally not associated with recovery of ANC and pH, but with decreases in Ca+Mg. These cation decreases may be linked to decreased groundwater inputs during the drier climatic conditions characterizing the study period and decreases in Ca+Mg in atmospheric deposition. In many of the Wisconsin lakes, an overall decline in SO4 2− was precluded by SO4 2− increases during a 4-year drought midway through the study period. During the drought, declining lake water level and volume caused evaporative concentration of solutes, and may have decreased the areal extent of sulfate reduction. Despite controls on sulfur emissions across the region, recovery of pH and ANC has been hindered by climatic shifts and concurrent decreases in atmospheric deposition of cations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00477205
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Temporal trends in low alkalinity lakes of the Upper Midwest (1983–1989) (1993)
    Springer
    Water, air & soil pollution 67 (1993), S. 397-414 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The Upper Midwest contains a large concentration of low alkalinity lakes located across a west to east gradient of increasing deposition acidity. We present temporal trends in the chemistry of 28 lakes (4 in Minnesota, 13 in Wisconsin, and 11 in Michigan) representative of the acid-sensitive resource of the region. Lakes were sampled three times per year between 1983 and 1989. Temporal trends in SO4 2− were all negative in direction, consistent with a regional decline in SO2 emissions and atmospheric SO4 2− deposition. However, these trends occurred predominantly in higher ANC (100 to 225 Μeq L−1), non-seepage lakes and were associated with increases in ANC and pH in only one of the 8 lakes. ANC decreased in a second group of lakes, usually in concert with decreased [Ca2++Mg2+], a response we associate with a severe drought. Disruptions in hydrologic flowpaths caused one lake to acidify rapidly after inputs of ANC-rich groundwater ceased and appeared to cause ANC and [Ca2++Mg2+] declines in a second lake by reducing stream-water inflow. Our analysis was thus complicated by hydrochemical effects of climatic variability, which confounded trends related to acidic deposition. Periods longer than 6 yr are needed to transcend climatic signals and verify subtle trends related to atmospheric pollutants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00478155
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Nitrogen and phosphorus removal by cypress swamp sediments (1985)
    Springer
    Water, air & soil pollution 24 (1985), S. 207-213 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Removal of nutrients from wastewater (effluent) by sediments in cypress swamps was studied in laboratory leaching columns filled with wet surface sediments. Columns were leached with low-nutrient groundwater, treated wastewater, and treated wastewater amended with nitrate (20 to 30 mg N L−1) and phosphate (9.5 mg P L−1) for 21 mo. From 99 to 100% of the nitrate-nitrite and P was removed from the amended wastewater eluants throughout the investigation; average concentrations of nitrate-nitrite and P in effluent from amended wastewater columns did not exceed concentrations in leachate from columns eluted with groundwater. Ammonium removal was approximately 50% in columns receiving treated wastewater. Sediments of cypress swamps have a large capacity to remove nutrients from secondary effluent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285445
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    facet.materialart.
    Unknown
    Changes in the sultan marshes ecosystem (Turkey) in satellite images 1980–2003 (2008)
    Springer
    Details
    Publication Date: 2008-09-01
    Print ISSN: 0277-5212
    Electronic ISSN: 1943-6246
    Topics: Biology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Dynamic hydrologic model of the Örtülüakar Marsh in Turkey (2006)
    Springer
    Details
    Publication Date: 2006-12-01
    Print ISSN: 0277-5212
    Electronic ISSN: 1943-6246
    Topics: Biology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...