| 摘要: |
| 【目的】探明新疆玛纳斯河流域植被净初级生产力（NPP）的时空变化规律及其影响因素。【方法】基于MODIS遥感数据以及地形、气象因子和人类活动数据，运用Slope趋势分析、相关分析和地理探测器，分析玛纳斯河流域2001—2021年NPP的时空变化特征及其驱动因素。【结果】2001—2021年，玛纳斯河流域年平均NPP为125.63 g C/（m2·a），2008年最低，为98.80 g C/（m2·a），2016年最高，为163.98 g C/（m2·a），NPP呈年际上升趋势。玛纳斯河流域NPP的空间分布格局呈北部和南部区域低而中部区域高的特征，近63.84%的区域NPP呈增加趋势，其中26.98%的区域NPP显著增加（P<0.05）；19.31%的区域NPP显著下降（P<0.05）。NPP随着高程和坡度的增加呈上升趋势，最高值出现在玛纳斯河流域的低山林草区；NPP与气温和降水呈正相关。各因子对NPP的影响程度由高到低依次为高程>土地利用>降水>坡度>GDP>气温>人口密度>夜间灯光，其中高程与土地利用的交互作用对NPP的影响最大。【结论】玛纳斯河流域NPP存在明显的时空分异特征，高程、土地利用以及降水对NPP的时空分布格局具有重要影响。 |
| 关键词: 植被净初级生产力；时空变化；驱动因素；地理探测器；玛纳斯河流域 |
| 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 |
