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| DOI：10.13522/j.cnki.ggps.2023247 |
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| Analysis of spatial-temporal changes and driving factors of net primary productivity of vegetation in the Manasi River basin |
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ZHAO Liman, WANG Xuemei
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1. College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China;
2. Xinjiang Laboratory of Lake Environment and Resources in Arid Zone, Urumqi 830054, China
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| Abstract: |
| 【Objective】To investigate the spatial and temporal variation patterns of net primary productivity (NPP) of vegetation and its influencing factors in the Manas River Basin, Xinjiang. 【Method】Based on MODIS remote sensing data as well as topography, meteorological factors and human activity data, the spatial and temporal change characteristics of NPP in the Manas River Basin and its driving factors from 2001 to 2021 were analyzed by using slope trend analysis, correlation analysis and geoprobe. 【Result】From 2001 to 2021, the multi-year average NPP in the Manas River Basin was 125.63 g C/(m2·a), with a minimum of 98.80 g C/(m2·a) in 2008 and a maximum of 163.98 g C/(m2·a) in 2016, and the NPP generally showed an inter-annual increasing trend. The spatial distribution pattern of NPP in the Manas River Basin was characterized by low in the Northern and Southern regions and high in the central region, with nearly 63.84% of the regions showing an increasing trend in NPP, of which 26.98% of the regions showed a significant increase in NPP (P<0.05); and 19.31% of the regions showed a significant decrease in NPP (P<0.05).The NPP showed an increasing trend with the increase of elevation and slope, with the highest values occurring in the low mountain forest and grassland areas of the Manas River basin; NPP was positively correlated with air temperature and precipitation. The degree of influence of each factor on NPP in descending order was elevation > land use > precipitation > slope > GDP > temperature > population density > nighttime light, among which the interaction between elevation and land use had the greatest influence on NPP. 【Conclusion】 The NPP in Manas River Basin has obvious spatial and temporal differentiation characteristics, and elevation, land use and precipitation have important effects on the spatial and temporal distribution pattern of NPP. |
| Key words: net primary productivity of vegetation; spatial-temporal variation; driving factors; geographic detector; Manasi River Basin |
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