基于MODIS像元尺度的成渝地区双城经济圈2000-2023年植被覆盖度时空变化及地形分异特征研究
Study on Spatiotemporal Changes of Vegetation Coverage and Terrain Differentiation Characteristics in Chengdu-Chongqing Twin Cities Economic Circle from 2000 to 2023 Based on MODIS Pixel Scale
周浪 1朱玲 2雷波1
作者信息
- 1. 重庆市生态环境科学研究院,重庆 401336;中国环境科学研究院西南分院,重庆 401336
- 2. 重庆市渝北职业教育中心,重庆 401135
- 折叠
摘要
为研究成渝地区双城经济圈植被覆盖时空变化及地形分异特征,本研究基于MODIS-NDVI数据,采用像元二分模型、Theil-Sen Median趋势分析和Mann-Kendal显著性检验方法,计算了 2000-2023 年成渝地区双城经济圈植被覆盖度(Fractional Vegetation Coverage;FVC)和总结了其变化规律.结果表明:(1)研究区在空间上主要以高植被覆盖为主要特征,高植被覆盖区域面积为 176 857.44 km2,面积占比高达 95.69%;(2)植被覆盖度在 2000-2023 年间整体上以改善区域为主,改善区域面积为 101 880.56 km2,占总面积的 55.12%,退化区域面积为 82 948.56 km2,占总面积的44.88%;(3)地形因子对研究区植被覆盖空间分布有着较为显著的影响,研究区植被覆盖度随海拔的上升,呈现出先增后降的规律;植被覆盖度随坡度的提升而增大;植被覆盖度在不同坡向上表现出阴坡植被覆盖度>半阳坡植被覆盖度>半阴坡植被覆盖度>阳坡植被覆盖度.
Abstract
In order to study the spatiotemporal changes of vegetation coverage and topographic differentiation characteristics in the Chengdu-Chongqing Twin Cities Economic Zone,based on MODIS-NDVI data,the pixel binary model,Theil-Sen Median trend analysis and Mann-Kendal significance test method were used to calculate the fractional vegetation coverage(FVC)of the Chengdu-Chongqing Twin Cities Economic Zone from 2000 to 2023 and summarize its changing rules.The results show that:(1)the study area is mainly characterized by high vegetation coverage in space,with an area of 176,857.44 km2,accounting for 95.69%of the total area;(2)the vegetation coverage is mainly in the improved area from 2000 to 2023,with an area of 101,880.56 km2,accounting for 55.12%of the total area,and the degraded area is 82,948.56 km2,accounting for 44.88%of the total area;(3)the topographic factors have a significant impact on the spatial distribution of vegetation coverage in the study area.The vegetation coverage in the study area increases first and then decreases with the increase of altitude;the vegetation coverage increases with the increase of slope;the vegetation coverage shows that the vegetation coverage of the shady slope is greater than the vegetation coverage of the semi-sunny slope,the vegetation coverage of the semi-shady slope is greater than the vegetation coverage of the sunny slope.
关键词
植被覆盖度/像元二分法/Theil-Sen/Median趋势分析/MK显著性检验/成渝地区双城经济圈Key words
vegetation coverage/pixel dichotomy/Theil-Sen Median trend analysis/MK significance test/Chengdu-Chongqing Twin Cities Economic Circle引用本文复制引用
出版年
2024
NETL
NSTL
万方数据