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[1]TIAN Zhihui,ZHANG Dandan,HE Xiaohui,et al.Spatiotemporal Variations in Vegetation Net Primary Productivity and Their Driving Factors in Yellow River Basin from 2000 to 2015[J].Research of Soil and Water Conservation,2019,26(02):255-262.

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Spatiotemporal Variations in Vegetation Net Primary Productivity and Their Driving Factors in Yellow River Basin from 2000 to 2015

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 02 Page number: 255-262 Column: Public date: 2019-04-28

Title:: Spatiotemporal Variations in Vegetation Net Primary Productivity and Their Driving Factors in Yellow River Basin from 2000 to 2015

Author(s):: TIAN Zhihui¹, ZHANG Dandan², HE Xiaohui¹, GUO Hengliang¹, WEI Haitao¹; 1. Smart City Institute of Zhengzhou, Zhengzhou University, Zhengzhou 450001, China;
2. College of Water Conservancy and Environmental Engineering, Zhengzhou University, Zhengzhou 450001, China

Keywords:: Yellow River Basin; vegetation NPP; spatiotemporal variation; climate factors; land use/cover change

CLC:: Q948;F301.24

DOI:: -

Abstract:: The regional differences are significant and the ecological environment is fragile and sensitive in Yellow River Basin. It is of great significance to study the vegetation net primary productivity (NPP) and to understand the production capacity of ecological environment. We used MOD17A3 NPP data, meteorological data, and land use/cover type data to investigate the spatiotemporal pattern, change trends, and driving factors of vegetation NPP in Yellow River Basin from 2000 to 2015. The data were analyzed using bias analysis, trend analysis, correlation analysis, and Markov transition model. The results showed that: (1) from 2000 to 2015, the average annual vegetation NPP for Yellow River Basin was 228.2 g C/(m²·a), ranging from 179.6 to 258.1 g C/(m²·a), showing the slightly volatile increase; the bias value of vegetation NPP showed the decreasing trend first and then the increasing trend. The average annual NPP decreased in the order: downstream > midstream > upstream, indicating that the ecological environment in the upper and middle reaches was relatively fragile; (2) vegetation NPP had a strong spatial variability in Yellow River Basin, showing a decreasing distribution from south to north; the total amounts NPP in different reaches varied significantly, decreasing in the order: midstream > upstream > downstream, so, it was crucial to strengthen the construction and protection of the ecological environment in the upper and middle reaches: vegetation NPP increased in most areas of the basin; (3) vegetation NPP was most affected by rainfall among the climatic factors. The regions strongly driven by climate factors mainly distributed in the western Sichuan Plateau, the Ordos Plateau, and the North China Plain; conversion of croplands to construction land and conversion of grasslands to desert were the main modes of losses of vegetation NPP in Yellow River Basin; it can be seen that the accelerated expansion of cities and human activities such as excessive reclamation and grazing were the main drivers of vegetation NPP losses. In the recent years, the areas of forests and grasslands have increased, and the overall NPP losses have been reduced. It can be seen that the implementation of Grain for Green Project has obtained initial success.

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