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- W2391992058 abstract "The LI-6400 Portable Photosynthesis System, produced by USA, was used to study the vertical variation of atmospheric CO 2concentration over desert and oases with different cover. The results showed that atmospheric CO 2concentration was 366 μmol·mol -1 over the southern edge of the Badain Jaran Desert in 2001. In autumn, the CO 2concentration gradient was 0 within 1～10 m height. The CO 2concentration was positively correlated with air temperature (correlative coefficient 0.87). But the CO 2concentration was negatively correlated with air relatively humidity and the coefficient was 0.86. In autumn, the CO 2 concentration over oasis region was higher. The key cause is the CO 2 emission of human activity. The CO 2 concentration gradients over oases with different vegetation cover were conspicuous different. The key factors are human activity, vegetation cover change and meteorological factor. In early autumn, the CO 2 concentration could be decreased by 2.2μmol·mol -1 at 10 m height when photosynthesis of Populus gansuensis was the greatest. Certainly, CO 2 concentration decreased obviously when precipitation." @default.
- W2391992058 created "2016-06-24" @default.
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- W2391992058 date "2002-01-01" @default.
- W2391992058 modified "2023-09-28" @default.
- W2391992058 title "Vertical Variations of Atmospheric CO_2 Concentration over Desert and Oases with Different Cover" @default.
- W2391992058 hasPublicationYear "2002" @default.
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