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川西高原植被NDVI动态变化特征及对气候因子的响应
谢慧君1, 张廷斌1,2, 易桂花3, 秦岩宾1, 李景吉2,4, 别小娟3, 范馨1
1.成都理工大学 地球科学学院, 四川 成都 610059;2.国家环境保护水土污染协同控制与联合修复重点实验室(成都理工大学), 四川 成都 610059;3.成都理工大学旅游与城乡规划学院, 四川 成都 610059;4.成都理工大学 生态环境学院, 四川 成都 610059
摘要:
[目的] 分析川西高原2001—2017年植被NDVI动态变化特征,研究植被NDVI对气候因子的响应,为区域水土保持和生态环境保护提供科学依据。[方法] 基于MOD09A1数据反演川西高原植被NDVI,结合中国气象科学数据共享服务网提供的气温和降水等资料,利用Theil-Sen media趋势分析、Mann-Kendall统计检验和Hurst指数等方法,分析川西高原2001—2017年植被NDVI的时空分布特征、变化趋势及持续性变化特征,探讨川西高原植被NDVI变化对气候因子的响应。[结果] ①川西高原2001—2017年植被NDVI均值为0.486,呈由西北向东南逐渐升高的趋势,垂直分布上植被NDVI随高程增加呈现先增加后下降趋势;②近17 a川西高原植被NDVI整体以0.01/10 a的速率变化,变化趋势以改善为主,改善和退化面积分别占比83.5%和16.5%;Hurst指数研究表明,川西高原植被NDVI总体变化持续性较强,反持续性较弱;③2001—2017年川西高原气温呈上升趋势,降水上升趋势不明显;整体上植被NDVI对气候的响应存在空间差异,研究区北部主要受气温和降水影响,西南部主要受降水影响。[结论] 川西高原植被的生长受气候、地形和人类活动等因素影响,植被NDVI呈现明显空间异质性。随着生态文明建设的持续推进,近17 a植被NDVI改善面积持续增加,且未来持续性较强。
关键词:  NDVI  趋势分析  Hurst指数  气候变化  川西高原
DOI:10.13961/j.cnki.stbctb.2020.04.039
分类号:S157.2;X87
基金项目:国家自然科学基金项目“气候变化与人类活动对若尔盖湿地景观格局影响的时空定量辨识”(41801099);第二次青藏高原综合科学考察研究(2019QZKK0307)
Dynamic Characteristics of NDVI Values and Its Response to Climatic Factors in Western Sichuan Plateau
Xie Huijun1, Zhang Tingbin1,2, Yi Guihua3, Qin Yanbin1, Li Jingji2,4, Bie Xiaojuan3, Fan Xin1
1.College of Earth Science, Chengdu University of Technology, Chengdu, Sichuan 610059, China;2.State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution(Chengdu University of Technology), Chengdu, Sichuan 610059, China;3.College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu, Sichuan 610059, China;4.College of Ecological Environment, Chengdu University of Technology, Chengdu, Sichuan 610059, China
Abstract:
[Objective] The spatio-temporal characteristics of normalized difference vegetation index (NDVI) values and its response to climatic factors were analyzed from 2001 to 2017 in order to provide a scientific basis for ecological environment protection and regional soil and water conservation in the Western Sichuan Plateau. [Methods] The NDVI of the Western Sichuan Plateau was retrieved from the MOD09A1 data. Combined with air temperature and precipitation data provided by China Meteorological Science Data Sharing Service Network, the spatio-temporal distribution, changing trends and continuous changing characteristics of the NDVI were analyzed by using the methods of Theil-Sen media trend analysis, Mann-Kendall statistical test and Hurst index, and the response of NDVI variations to climate factors was also explored. [Results] ① From 2001 to 2017, the mean value of NDVI in the Western Sichuan Plateau was 0.486, showing a trend of gradual increase from northwest to southeast. In vertical distribution, the NDVI mean value firstly increased and then decreased with the increasing of elevation; ② In nearly 17 years, the NDVI increased at the rate of 0.01/10 a in the Western Sichuan Plateau. The changing trends of NDVI were dominated by improvement, and improved and degraded areas accounted for 83.5% and 16.5%, respectively. According to the study of Hurst index, the overall change of NDVI in the Western Sichuan Plateau had a strong persistence, while its anti-persistence was weak. ③ From 2001 to 2017, the air temperature in the Western Sichuan Plateau showed an upward trend, and no significant trend in precipitation was obvious. On the whole, there were spatial differences in the response of NDVI to climate. The NDVI in the northern region of the study area was mainly affected by air temperature and precipitation, whlie the NDVI in the southwest region was mainly affected by precipitation. [Conclusion] Vegetation growth in the Western Sichuan Plateau was shown to be controlled by climate, topography and human activities. The NDVI presents obvious spatial heterogeneity. With the continuous progress of ecological civilization construction, the improved areas of NDVI continued to increase in nearly 17 years, and has strong sustainability in the future.
Key words:  NDVI  trend analysis  Hurst index  climate change  Western Sichuan Plateau