2000—2019年若尔盖高原植被净初级生产力时空动态变化及其与气候因子的关系

Spatiotemporal Dynamics of Vegetation Net Primary Productivity on the Zoige Plateau from 2000 to 2019 and Its Relationship with Climate Factors

  • 摘要: 基于2000—2019年逐年MODIS–NPP数据和逐月气温、降水数据,采用一元线性回归和偏相关分析等方法,研究了若尔盖高原植被NPP的时空变化特征及其与气候因子的关系。结果表明:若尔盖高原植被多年平均NPP为366.55 gC/(m2·a),呈东高西低的态势;2000—2019年植被平均NPP总体上以1.66 gC/(m2·a)的增加速率呈波动上升的趋势,植被NPP呈上升趋势的面积占整个高原面积的95.75%。不同生态系统类型间植被多年平均NPP存在差异,森林生态系统>湿地生态系统>草地生态系统;年际增长速率也有所不同,湿地生态系统>草地生态系统>森林生态系统。若尔盖高原植被NPP与降水量总体上呈现弱的负相关关系,表明降水量并不是影响若尔盖高原植被NPP的主导气候因子;若尔盖高原植被NPP变化主要受气温的影响,气温是若尔盖高原植被NPP变化的主要驱动因子。此外,还发现年均最高温、年均最低温对若尔盖高原植被NPP变化的影响不同,年均最高温对若尔盖高原植被NPP的影响更为显著。

     

    Abstract: Based on annual MODIS–NPP data and monthly temperature and precipitation data from 2000 to 2019, the temporal and spatial variation characteristics of vegetation NPP and its relationship with climate factors in Zoige Plateau were analyzed by means of univariate linear regression and partial correlation analysis. The results showed that the average annual NPP of vegetation in Zoige Plateau was 366.55 gC/(m2·a), with a trend of higher in the east and lower in the west; the average vegetation NPP increased at a rate of 1.66 gC/(m2·a) from 2000 to 2019, and the area of vegetation NPP increased was 95.75% of the whole plateau. The average annual NPP of vegetation was different among different ecosystem types, forest ecosystem > wetland ecosystem > grassland ecosystem; the interannual growth rate is also different, wetland ecosystem > grassland ecosystem > forest ecosystem. There was a weak negative correlation between vegetation NPP and precipitation in the Zoige Plateau, indicating that precipitation was not the dominant climate factor affecting NPP in the Zoige Plateau; the variation of vegetation NPP in Zoige Plateau was mainly affected by temperature, which was the main driving factor of NPP variation in Zoige Plateau. In addition, it was found that maximum temperature and minimum temperature had different effects on vegetation NPP in Zoige Plateau, and the effect of maximum temperature on vegetation NPP in Zoige Plateau was more significant.

     

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