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The overall NPPp of alpine grassland demonstrated a downward trend, and precipitation is regarded as the major influencing factor. The results reveal that the temperature of alpine grassland in Qinghai Province has a slight upward trend from 2005 to 2018, and precipitation displays a downward trend. Finally, the driving factors of NPP change in alpine grassland and the reasonable stocking rate are clarified in Qinghai Province during 2005–2018. Second, using the NPPh and actual grassland productivity consumed by livestock (NPPac), the reasonable stocking rate is obtained. First, climate change is quantified by potential net primary productivity (NPPp) and measured by adopting the Zhou Guangsheng model, and the NPP generated by anthropogenic activities (NPPh) is estimated by the distinction between NPPp and actual NPP (NPPa) calculated with the application of the Carnegie–Ames–Stanford Approach (CASA) model. A new scenario design method to evaluate the reasonable stocking rate is presented in the current work. The results of the CCA ordination reflected that slope and aspect are the dominant factors among microtopography in the species distribution of sandy alpine grassland.Īn accurate assessment of the stocking rate is crucial for maintaining the stable function and the sustainable use of the alpine grassland ecosystem. The distribution of the seven associations in the DCA ordination graph showed certain regularity. secalinus+Elymus dahuricus+Ajania tenuifolia, Ass IV. We identified seven associations through TWINSPAN: Ass I. Species standard frequency distribution varied with different microtopography, the proportion of dominant species was generally lower than that of rare species, and the vegetation community was in a highly successional stage. The occurrence of Leymus secalinus, Heteropappus altaicus, and Corispermum declinatum indicated that desertification of alpine grassland is in progress, and the vegetation community was successional to the direction of xeric. The species composition of the investigated community was simple, with 29 species grouped into 27 genera and 16 families. Analyses were performed by using winTwin 2.3, Canoco 5.0, and Excel 2013 software.
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Typical sandy alpine grassland distributed in hilly sloped lands, floodplains, foothills, and gully areas were selected as four sampling locations and sampled using four sampling lines for a total of 60 samples. Our objective was to determine sandy alpine grassland characteristics and the relationship between plant distribution and microtopography. Sandy alpine grasslands are an important community type in source regions of the Yangtse and Yellow rivers, which affect the progress and reversal of desertification.