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  • Incidence
  • root respiration
  • 2000-2004  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    On the assessment of root and soil respiration for soils of different textures: interactions with soil moisture contents and soil CO2 concentrations (2000)
    Springer
    Plant and soil 227 (2000), S. 215-221 
    Details
    ISSN: 1573-5036
    Keywords: citrus ; Citrus volkameriana ; root respiration ; soil CO2 efflux ; soil CO2 concentration ; soil water relations ; Volkamer lemon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Estimates of root and soil respiration are becoming increasingly important in agricultural and ecological research, but there is little understanding how soil texture and water content may affect these estimates. We examined the effects of soil texture on (i) estimated rates of root and soil respiration and (ii) soil CO2 concentrations, during cycles of soil wetting and drying in the citrus rootstock, Volkamer lemon (Citrus volkameriana Tan. and Pasq.). Plants were grown in soil columns filled with three different soil mixtures varying in their sand, silt and clay content. Root and soil respiration rates, soil water content, plant water uptake and soil CO2 concentrations were measured and dynamic relationships among these variables were developed for each soil texture treatment. We found that although the different soil textures differed in their plant-soil water relations characteristics, plant growth was only slightly affected. Root and soil respiration rates were similar under most soil moisture conditions for soils varying widely in percentages of sand, silt and clay. Only following irrigation did CO2 efflux from the soil surface vary among soils. That is, efflux of CO2 from the soil surface was much more restricted after watering (therefore rendering any respiration measurements inaccurate) in finer textured soils than in sandy soils because of reduced porosity in the finer textured soils. Accordingly, CO2 reached and maintained the highest concentrations in finer textured soils (〉 40 mmol CO2 mol−1). This study revealed that changes in soil moisture can affect interpretations of root and soil measurements based on CO2 efflux, particularly in fine textured soils. The implications of the present findings for field soil CO2 flux measurements are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026502414977
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    Paper (German National Licenses)
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  • 2
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    Cholera dynamics and El Nino-Southern Oscillation (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-09-08
    Description: Analysis of a monthly 18-year cholera time series from Bangladesh shows that the temporal variability of cholera exhibits an interannual component at the dominant frequency of El Nino-Southern Oscillation (ENSO). Results from nonlinear time series analysis support a role for both ENSO and previous disease levels in the dynamics of cholera. Cholera patterns are linked to the previously described changes in the atmospheric circulation of south Asia and, consistent with these changes, to regional temperature anomalies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pascual, M -- Rodo, X -- Ellner, S P -- Colwell, R -- Bouma, M J -- New York, N.Y. -- Science. 2000 Sep 8;289(5485):1766-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center of Marine Biotechnology, University of Maryland Biotechnology Institute, 701 East Pratt Street, Suite 236, Columbus Center, Baltimore, MD 21202, USA. mercedes@pampero.umbi.umd.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10976073" target="_blank"〉PubMed〈/a〉
    Keywords: Bangladesh/epidemiology ; Cholera/*epidemiology/transmission ; *Climate ; Endemic Diseases ; Forecasting ; Humans ; Incidence ; *Models, Statistical ; Neural Networks (Computer) ; Nonlinear Dynamics ; Seasons ; Statistics, Nonparametric ; Temperature ; Weather
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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