北京植被时空变化与气候因子相关性

    Correlation between temporal-spatial changes of vegetation and climate factors in Beijing

    • 摘要: 基于北京市2000—2015年SPOT遥感影像归一化植被指数(NDVI),结合气温、降水量、日照时长等气候因子,采用一元线性回归分析法、趋势分析法、变异系数法及二阶偏相关系数法,剖析北京NDVI时空变化与气候因子的相关性:2000—2015年间,北京植被覆盖变化总体呈缓慢波动上升趋势;中心城区多为低植被覆盖区,郊区多为高植被覆盖区;NDVI呈上升趋势的面积占总面积的73.09%,植被覆盖水平有所提升;多数区域NDVI波动较小,波动剧烈区域主要集中于东城区和西城区;由偏相关系数及其显著性可知,降水量对NDVI影响最大,气温次之,日照时长影响居后。

       

      Abstract: Based on the normalized vegetation index (NDVI) data of SPOT remote sensing images in Beijing from 2000 to 2015, combined with the data of climate factors such as temperature, precipitation and sunshine duration, univariate linear regression analysis, trend analysis, coefficient of variation and second-order partial correlation coefficient were used to analyze the correlation between temporal-spatial changes of NDVI and climate factors in Beijing.The change of vegetation cover in Beijing in the past 16 years showed a slow fluctuation and upward trend.The low vegetation coverage area was mainly distributed in the central urban area, and the high vegetation coverage area was mainly distributed in the outer suburbs.The area with increasing NDVI accounted for 73.09% of the total area, and the vegetation coverage level was improved.In most areas, the fluctuation of NDVI was small, and the areas with severe fluctuation were mainly concentrated in Dongcheng District and Xicheng District.According to the partial correlation coefficient and its significance, it is concluded that precipitation had the greatest impact on NDVI, followed by temperature and sunshine duration.

       

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