1.Lanzhou Institute of Arid Meteorology, China Meteorological Administration/Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, China Meteorological Administration, Lanzhou 730020, China
2.Dingxi Meteorological Bureau, Dingxi 743000, China
3.Baiyin Meteorological Bureau, Baiyin 730900, China
Based on daily surface meteorological observations from the source area of the Yellow River from 1970 to 2019, the vegetation net primary productivity (NPP) was calculated using the corrected Thornthwaite Memorial model and the interannual variation patterns and regional distribution features were also analyzed. The results show that from 1970 to 2019, the precipitation in the source area of the Yellow River showed an increasing trend with an average growth rate of 9.057 mm·(10 a)-1. Simultaneously, temperatures have continued to rise with an average increase rate of 0.379 ℃·(10 a)-1. Since 1978, the temperature has continued to rise, and the maximum evapotranspiration in the river source area has also shown increasing trend with an average maximum evapotranspiration rising rate of 4.945 mm·(10 a)-1; the vegetation NPP was 5 993.7~10 534.5 kgˑ(hm2ˑa) -1, and the regional average vegetation NPP increased at a rate of 131.4 kgˑ(hm2ˑ10 a) -1. The decadal climate changes in the source area alternated between "warm-dry" and "warm-wet" phases. The 1970s, 1990s and 2000s were characterized as warm dry periods, while the 1980s and 2011-2019 were warm wet periods. Changes of the vegetation NPP were influenced by natural factors and human activity, and NPP reached its lowest point in the 1990s, but increased after the start of the 21st century.
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