WU Yidan,MA Yue,WU Haoran,et al.Characteristics of Temporal and Spatial Evolution and Driving Forces of Vegetation Index in Sichuan Based on MODIS-EVI[J].Research of Soil and Water Conservation,2020,27(05):230-236,243.
基于MODIS-EVI指数的四川省植被指数时空演变特征及驱动力
- Title:
- Characteristics of Temporal and Spatial Evolution and Driving Forces of Vegetation Index in Sichuan Based on MODIS-EVI
- 文章编号:
- 1005-3409(2020)05-0230-07
- 关键词:
- MODIS-EVI指数; 时空演变; 驱动力; 四川省
- Keywords:
- MODIS-EVI; space-time evolution; driving force; Sichuan Province
- 分类号:
- Q948
- 文献标志码:
- A
- 摘要:
- 四川省地形地貌复杂,是长江流域生态屏障的战略要地,探究该区域植被覆盖时空演变规律,以此检验各项水土保持工程的完成度、生态环境建设举措的实施度具有重要意义。研究基于MODIS的增强型植被指数(EVI)数据,运用趋势线分析、莫兰指数分析、热点分析等方法,分析了2001—2018年四川省EVI植被指数的时空变化及其影响因素。结果表明:(1)四川省EVI植被指数空间上明显呈东高西低分布规律,空间异质性显著;(2)2001—2018年EVI指数以0.22%/a的速率波动上升,13.6%研究区域的年际EVI变化率为负值,86.4%为正值。高值集中分布在四川东部广元、达州、宜宾、泸州、乐山、眉山和广安等地市,负值集中分布在甘孜、阿坝州以及成都市; 2001—2018年四川省整体植被改善程度良好,但川西北高原和川西南山地地区的改善度明显低于川东四川盆地;(3)2001—2018年四川省EVI植被指数增长明显,EVI指数变化与气象因子关联度低,与人工生态工程相关性高。生态工程建设是其变化的主要驱动力。
- Abstract:
- Sichuan Province has the complex topography and geomorphology which is a strategic place for ecological barriers in the Yangtze River Basin. It is of great significance to investigate the temporal and spatial evolution of vegetation coverage in this region to test the completion of various soil and water conservation projects and the implementation of ecological and environmental construction measures. Based on the MODIS Enhanced Vegetation Index(EVI)data, the trend-line analysis, Moran index analysis, and hotspot analysis were used to analyze the temporal and spatial changes of the EVI vegetation index and its influencing factors in Sichuan Province from 2001 to 2018. The results showed that:(1)the spatial distribution of the EVI vegetation index in Sichuan Province was obviously high in the east and low in the west, and the spatial heterogeneity was significant;(2)the EVI index fluctuated at a rate of 0.22% per year from 2001 to 2018, the inter-annual EVI change rate was negative in 13.6% of the research region and was positive in 86.4% of the research region; high values concentrated in the cities of Guangyuan, Dazhou, Yibin, Luzhou, Leshan, Meishan, and Guang'an in eastern Sichuan, negative values concentrated in Ganzi, Aba Prefecture, and Chengdu; from 2001 to 2018, the overall vegetation improvement in Sichuan Province was good, but the degree of improvement in the northwestern Sichuan plateau and the mountainous region in southwestern Sichuan was significantly lower than that in the eastern Sichuan Basin;(3)the EVI vegetation index in Sichuan Province had increased significantly from 2001 to 2018, and the change in EVI index had low correlation with meteorological factors and high correlation with artificial ecological engineering, indicating that the ecological engineering construction was the main driving force for its change.
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备注/Memo
收稿日期:2019-11-05修回日期:2019-12-05
资助项目:大学生创新训练项目“基于GWRK的GPM降水数据的融合校正研究”(201910626034); 国家自然科学基金“川中丘陵区小流域侵蚀产沙与土壤营养元素流失对退耕还林的响应研究”(41501291)
第一作者:伍宜丹(1999—),女,四川眉山人,本科生,研究方向为3S技术及其应用。E-mail:wuyidan1119@163.com,15528296659
通信作者:李豪(1980—),男,广西梧州人,博士,讲师,主要从事3S技术及其应用的研究。E-mail:lihao@sicau.edu.cn,15388230351