2000~2019年山西省植被覆盖度时空变化特征及地形因素分析
Spatial and temporal variation characteristics of vegetation coverage and analysis of topographic factors in Shanxi Province from 2000 to 2019
目的 探究山西省植被覆盖度时空变化特征以及地形因子对植被覆盖度的影响,为该地区态环境建设和保护提供依据。 方法 利用年度NDVI数据、DEM影像,运用像元二分模型法、一元线性回归模型并结合空间叠加分析,研究了2000~2019年山西省植被覆盖度在时间和空间上的动态变化及其与地形因子的关系。 结果 山西省植被覆盖度在空间分布上表现出自西北向东南呈现出由低到高再到低的趋势,其中植被覆盖度分布面积较高的有阳泉市、长治市和晋城市等,且2000~2019年植被覆盖度改善的面积要大于退化的面积;2000~2019年山西省植被覆盖度整体呈现上升趋势,增长速率为每年0.196%,由低覆盖、中低覆盖和中覆盖向中高覆盖和高覆盖转变;从地形因素来看,植被覆盖度受坡向的影响较小,但受坡度和高程的影响较大,随着坡度和高程的增加,植被覆盖度呈上升趋势。 结论 2000~2019年植被覆盖度整体表现增加的趋势,植被改善较好。植被覆盖度变化在坡度、高程地形条件下差异显著,在坡向地形条件下差异不明显。
Objective The study aimed to explore the temporal and spatial variation characteristics of vegetation coverage in Shanxi Province and the impact of topographic factors on vegetation coverage,providing,laying a basis for the construction and protection of ecological environment by using the favorable terrain in the region. Method Based on the annual NDVI data and DEM images,the temporal and spatial changes of vegetation coverage in Shanxi Province from 2000 to 2019 and its relationship with topographic factors were analyzed by using pixel binary model method,univariate linear regression and spatial superposition analysis. Result The spatial distribution of vegetation coverage in Shanxi Province showed a trend of low-high-low from northwest to Southeast.Of this region,Yangquan City,Changzhi City and Jincheng city had a larger area of vegetation coverage,where the improved area of vegetation coverage was greater than the degraded area from 2000 to 2019.From 2000 to 2019,the vegetation coverage in Shanxi Province showed an overall upward trend,with a growth rate of 0.196%/a,changing from the low coverage,medium-low coverage and medium coverage to the medium-high or high coverage.From the perspective of topographic factors,the vegetation coverage was less affected by slope aspect,but more affected by slope and elevation,and with the increases of slope and elevation,the vegetation coverage showed an upward trend. Conclusion From 2000 to 2019,the vegetation coverage showed an overall increasing trend,and the vegetation was improved greatly. The change of vegetation coverage was significant under different conditions of slope and elevation terrain,but not significant under different slope-direction and terrain conditions.
vegetation coverage / spatiotemporal variation / topographical factors / Shanxi Province
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