Applying the Moisture Availability Index NTDI over Vegetated Land in Central Asia: Mongolian SteppeReport as inadecuate




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The intensity ofrecent droughts and the uncertainty of moisture variability in the context ofincreasing temperatures and decreasing precipitation have affected theMongolian grassland. Mongolia typifies the steppe terrain and semiarid to aridcontinental climate that extends across much of Central Asia. In semi-aridareas like Mongolian steppe, vegetation type and distribution are directlyrelate to the amount of water that plants can extract from the soil. An indexfor assessment of moisture availability ma:defined as the ratio of actual to reference evapotranspiration was developed,namely NTDI 1. NTDI Normalized Day-Night SurfaceTemperature Difference Index is defined as the ratio of the difference betweenthe maximum daytime surface temperature and the minimum nighttime surfacetemperature, to the difference between the maximum and minimum surfacetemperatures estimated from meteorological data by applying energy balanceequations. A verification study conducted at Liudaogou River Basin of the LoessPlateau, China, indicated the capability of NTDI to estimate ma accurately, R2=0.97,p. In Bayan Unjuul, Mongolia, application ofNTDI during the growing season showed a significant inverse exponentialcorrelation with ma R2=0.86,p



Author: Abdelmoneim A. Mohamed1*, Reiji Kimura2

Source: http://www.scirp.org/



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