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| DOI：10.13522/j.cnki.ggps.2024194 |
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| Spatiotemporal patterns and driving factors of terrestrial ecosystem gross primary productivity in the Henan Section of the Yellow River Basin |
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CUI Mengyang, CAO Yanping, WANG Shaokun, YANG Kang
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1. Faculty of Geographical Science and Engineering, Henan University, Zhengzhou 450046, China; 2. Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Ministry of Education, Henan University, Kaifeng 475004, China
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| Abstract: |
| 【Objective】This study investigates the spatiotemporal dynamics of gross primary productivity (GPP) in the Henan Section of the Yellow River Basin, identify its extent and driving factors, and to provide a scientific basis for ecosystem conservation and management.【Method】We used Theil-Sen median trend analysis and the Mann-Kendall test to assess long-term GPP trends from 2001 to 2022. The GeoDetector model was used to evaluate the influence of climatic, topographic, and anthropogenic factors on spatial variation in GPP.【Result】From 2001 to 2022, the overall GPP in the region showed a fluctuating yet upward trend. Spatially, GPP distribution was highly heterogeneous, with clusters of high values primarily in the Southwest and lower values in central and Northern areas. Regions with increasing GPP accounted for 89.23% of the total area, concentrated in Sanmenxia, Luoyang, Jiyuan, and Xinxiang. Although the total area of cropland, grassland, and forestland declined during this period, their respective annual GPP levels increased. Slope aspect, elevation, and population size emerged as the primary factors influencing spatial variation in GPP. Interaction analysis indicated that the combined effects of slope gradient and elevation had the strongest influence on GPP. Furthermore, ecological factor analysis highlighted slope aspect, elevation, population density, and cropland area as significant contributors to GPP variation. Risk assessment revealed that areas with stable temperature, increased precipitation, and gentle terrain supported higher GPP growth.【Conclusion】The Henan Section of the Yellow River Basin has seen GPP improvement in the past two decades, despite reductions in vegetated land area. Topographic and climatic factors, especially elevation and slope-related variables, play the dominant role in shaping GPP patterns, while anthropogenic factors have a moderate influence. These findings underscore the need to consider terrain and climate stability in regional ecological management and suggest that targeted conservation in high-growth areas may further enhance ecosystem productivity. |
| Key words: gross primary productivity; geodetector; climate change; human activity; Henan Section of the Yellow River Basin |
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