Distribution pattern of NDVI and hydrothermal conditions in the Yellow River Headwaters based on elevation section
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Abstract:
Different datasets ( MODIS13Q1 NDVI, DEM, LULC, and meteorological data) were used to study the regional differences of the spatial distribution pattern of NDVI and hydrothermal conditions in the Yellow River Headwaters. The distribution pattern of vegetation and hydrothermal conditions and the correlation between NDVI and hydro thermal fact ors were analyzed and investig ated based on three elevation sections ( section I< 3 400 m, section II 3 400 m~ 4 200 m, section III> 4 200 m) , respectively. The results showed that the maintype of vegetation in the Yellow River Headwaters was grassland, which accounted for 75% of the to tal area. However, forest and farmland areas accounted for 7% and 1% , respectively. Farmland was mainly distributed in sect ion ? and the forest was mainly distributed in section ò , while grass grows in all three sections. The average NDVI of different vegetation types ranks in this order: forest, grassland, and farm land. Moreover, the temperature displayed a spatial distribution pattern of decline gradient, and the precipitation represented a declining trend from southeast to northwest. The three partitions have different hydrothermal conditions. Section I belonged to the arid region, section II belonged to the moistheat region, and section ó belonged to the dry region, respectively. Section ò had the relatively best hydrot hermal combination conditions, which was followed by section ? , while section ó had the worst of three partitions. The results also revealed that NDVI was driven by different hydrothermal factors indifferent sections. The main factor that affected the growth of vegetation in section I and ó was precipitation, while in section II, the temper ature is the main factor while the rainfall was abundant .
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