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  • 1
    Electronic Resource
    Electronic Resource
    Spectral Reflectance, Growth and Chlorophyll Relationships for Rice Crop in a Semi-Arid Region of India (1999)
    Springer
    Water resources management 13 (1999), S. 73-84 
    Details
    ISSN: 1573-1650
    Keywords: chlorophyll ; growth ; rice crop ; spectral reflectance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Abstract Relations among spectral reflectance, chlorophyll ‘a’, and growth of rice plants grown on irrigated light textured soil in a semi arid region are presented here. There was a linear relation between spectral reflectance and rice plant height (r = 0.97), for band 1 (0.45–0.52 μm) reflectance values. On the other hand, in bands 2 (0.52–0.60 μm) and 3 (0.63–0.69 μm), reflectance values decreased until 70 days after planting (DAP) and then increased during the reproductive phase of the crop. The near infrared band 4 (0.76–0.90 μm) showed a maximum reflectance at 59 DAP (panicle initiation stage) and a decline in reflectance thereafter through maturity. The peak value of IR/R ratio was 16.39 at 62 DAP during the early reproductive phase; thereafter, it declines gradually with the maturity of the crop. Chlorophyll ‘a’ concentration was high during early growth (vegetative and early reproductive stages) and decreased during the flowering and maturity stages. The rice plant canopy show a high chlorophyll ‘a’ concentration at 64 and 59 DAP for sites A and B, respectively. Chlorophyll ‘a’ concentration is higher in site A plant canopies than it is in site B during the entire crop cycle. A good inverse correlation (r = 0.91) has been found between chlorophyll ‘a’ and band 1, while the IR/R ratio and the normalised difference vegetation index (NDVI) showed a relationship (r = 0.78) with the chlorophyll ‘a’ concentration during the crop cycle. Band 2, 3 and 4 radiance values show a biphasic linear relationship with chlorophyll ‘a’ concentrations, negative for early growth and positive for flowering and maturity stages. Results indicate that the period between 66 to 70 DAP is most suitable for the assessment of rice crop yield, based on chlorophyll ‘a’ concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008056400348
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of environmental parameters on the biomass development ofRuppia drepanensis populations in Doñana National Park: the importance of conditions affecting the underwater light climate (1996)
    Springer
    International journal of salt lake research 5 (1996), S. 157-180 
    Details
    ISSN: 1573-8590
    Keywords: brackish marsh ; growth ; light attenuation ; submerged macrophyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract The development of submerged plant communities dominated byRuppia drepanensis Tineo in the brackish marsh of the Doñana National Park (SW Spain) was coupled to seasonal variation in environmental factors for two consecutive years. Plant biomass increased rapidly in early spring (March), with steady biomass yields (up to 100 g afdw m−2) together with abundant flowering and fruiting in late spring (April–May). Wind-induced sediment resuspension and periphyton growth strongly influenced the light climate experienced by the submerged vegetation, while a phytoplankton effect was generally negligible. Development of the submerged vegetation coincided with a decrease in water extinction coefficient and in bicarbonate concentration. Thus, where dense macrophyte meadows develop, light climate probably is the limiting factor in the early spring, while temperature and bicarbonate levels are so by the end of the season. Interannual variation was found to be very high, both in abundance and distribution of the submerged vegetation, mainly because of differences in rainfall which influenced the inundation cycle. Grazing by waterfowl accounted also for this effect, as in dry years birds concentrate in the few wetlands still containing water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01995828
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  • 3
    Electronic Resource
    Electronic Resource
    The transition from physical infrastructure to infostructure: infrastructure as a modernising agent in Singapore (1999)
    Springer
    GeoJournal 49 (1999), S. 279-288 
    Details
    ISSN: 1572-9893
    Keywords: globalisation ; growth ; information technology ; infrastructure ; knowledge ; modernisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract This study examines the modernising role played by infrastructure and the transition of emphasis from physical infrastructure to knowledge-based infostructure as a source of economic growth in Singapore, noting the factors behind the change in strategy. Occupying a strategic sea route location and serving a resource-rich hinterland, Singapore inherited from the old British empire a well-established infrastructure when it achieved self-government in 1959. Since 1965, Singapore's development has been led by a pro-business developmentalist government, and strongly linked to technological advances in the West on which it also relies heavily for its exports and multinational corporation investments. From the 1980s, the government has launched a series of pro-IT plans to prepare the city-state's transition to an `intelligent island', and a regional hub for high-technology, and international financial transactions, a full-swing state-initiated strategy to leap from a semi-peripheral economy to be part of the developed core, and enhance its status to that of a world city. Despite barriers, some positive results have been observed. In terms of IT's spatial effect, it is largely overshadowed by the predeterministic long-term plans of the state's powerful planning authority.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007051305570
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