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All Library Books, journals and Electronic Records Telegrafenberg

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  • Articles  (7)
  • Articles: DFG German National Licenses  (7)
  • Agriculture  (4)
  • biomass
  • diversity
  • 2010-2014
  • 1980-1984  (7)
  • 1950-1954
  • Energy, Environment Protection, Nuclear Power Engineering  (7)
  • Ethnic Sciences  (5)
  • History
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  • Articles  (7)
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  • Articles: DFG German National Licenses  (7)
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  • 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
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  • 2
    Electronic Resource
    Electronic Resource
    Agriculture and stream water quality: A biological evaluation of erosion control practices (1984)
    Springer
    Environmental management 8 (1984), S. 333-343 
    Details
    ISSN: 1432-1009
    Keywords: Agriculture ; Benthic macroinvertebrates ; Erosion control ; Sediment ; Water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Agricultural runoff affects many streams in North Carolina. However, there is is little information about either its effect on stream biota or any potential mitigation by erosion control practices. In this study, benthic macroinvertebrates were sampled in three different geographic areas of North Carolina, comparing control watersheds with well-managed and poorly managed watersheds. Agricultural streams were characterized by lower taxa richness (especially for intolerant groups) and low stability. These effects were most evident at the poorly managed sites. Sedimentation was the apparent major problem, but some changes at agricultural sites implied water quality problems. The groups most intolerant of agricultural runoff were Ephemeroptera, Plecoptera and Trichoptera. Tolerant species were usually filter-feeders or algal grazers, suggesting a modification of the food web by addition of particulate organic matter and nutrients. This study clearly indicates that agricultural runoff can severely impact stream biota. However, this impact can be greatly mitigated by currently recommended erosion control practices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868032
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Does the Swidden Ape the Jungle? (1983)
    Springer
    Human ecology 11 (1983), S. 1-12 
    Details
    ISSN: 1572-9915
    Keywords: Agriculture ; cultural ecology ; South America ; intercropping ; diversity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract Results of recent ethnographic research in indigenous agricultural systems in the South American tropical forests indicate that the Geertzian model of the highly intercropped swidden that mimics the tropical forest it replaces is not the appropriate description of the agricultural regimes of several rainforest peoples. A model is proposed relating degree of intercropping to amount of agricultural labor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00891227
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  • 4
    Electronic Resource
    Electronic Resource
    Ecological succession in new and old swiddens of montane Papua New Guinea (1981)
    Springer
    Human ecology 9 (1981), S. 359-377 
    Details
    ISSN: 1572-9915
    Keywords: succession ; cultural ecology ; shifting cultivation ; biomass ; net productivity ; swidden
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract Fieldwork conducted in new and old swiddens in the Maring territory of the Bismarck Mountains of Papua New Guinea indicated a successional sequence of crop composition, diversity, and biomass regulated by human and ecological processes. With increasing swidden age, the number of cultivated species, individuals, varieties, and net productivity decreased. In contrast to new swiddens, old swiddens were characterized by a simplified crop composition and a distinct vertical stratification. While a 3-month-old garden contained 10 cultivar species, 43.5 plantings of taro, a cultivar biomass content of 2.54 kg/25 m2, and a net productivity of 1.13 gm/m2/day, a 2-year-old garden contained six cultivar species, no taro plantings, a cultivar biomass content of 13.80 kg/25 m2, and a net productivity of 0.77 gm/m2/day. Differences in the life histories of cultivars help determine cultivar succession. This study quantitatively defines these changing characteristics of old and new swiddens. It concludes that the Kauwatyi system of subsistence, which emphasizes diversity and conservation practices, such as the planting and protection of certain forest regrowth species, ensures the regeneration of forest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00890742
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  • 5
    Electronic Resource
    Electronic Resource
    A comparison of the diversity of Jivaroan Gardens with that of the tropical forest (1983)
    Springer
    Human ecology 11 (1983), S. 47-68 
    Details
    ISSN: 1572-9915
    Keywords: Intercropping ; manioc ; Jivaro ; diversity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract The proposition that tropical polycultural gardens simulate the structure and dynamics of the surrounding forest is examined in the light of research on Jivaroan manioc cultivation. Garden transects were used to measure the diversity of intercropped species and of locally recognized varieties of manioc. Huambisa and Aguaruna Jivaro gardens have much lower species diversities than the surrounding forest, even though crop compositions reflect the age, topography, and soil type of the swiddens. Furthermore, the number of manioc varieties is far greater than that of all other crop species combined. It is argued that a pure stand of Jivaroan manioc can itself be considered a polycrop of distinct cultivars with differing branching patterns, leaf shapes, and growth periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00891230
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  • 6
    Electronic Resource
    Electronic Resource
    Barí Swidden gardens: Crop Segregation patterns (1983)
    Springer
    Human ecology 11 (1983), S. 85-101 
    Details
    ISSN: 1572-9915
    Keywords: Agriculture ; swidden ; diversity ; intercropping ; South America
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract The proposition that tropical forest swidden gardens mimic the extraordinary species diversity of the forest by the use of extensive intercropping is examined in the light of the field architecture of the Barí, a people of the Maracaibo basin. Barí fields manifest annular zonation rather than intercropping. It is concluded that Barí horticulture is an inversion of the jungle rather than an imitation of it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00891232
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  • 7
    Electronic Resource
    Electronic Resource
    Agriculturally induced vegetation change, 1950–1975 (1980)
    Springer
    Human ecology 8 (1980), S. 105-116 
    Details
    ISSN: 1572-9915
    Keywords: agriculture ; biomass ; biomass distribution ; biomass change ; net primary productivity ; vegetation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract Changes in worldwide grain production area are analyzed to assess the impact of major agricultural activity onglobal biomass. During the 26-year study period, nearly 1% of the earth's ice-free land surface was converted to grain production. This increase in agricultural area reduced the planetary biomass; however, it had minimal effect on net primary productivity. Geographically, the overall change caused by increased grain production has been to redistribute the planetary biomass poleward.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01531437
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