Dynamic Characteristics of NDVI Values and Its Response to Climatic Factors in Western Sichuan Plateau

Xie Huijun; Zhang Tingbin; Yi Guihua; Qin Yanbin; Li Jingji; Bie Xiaojuan; Fan Xin

doi:10.13961/j.cnki.stbctb.2020.04.039

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Dynamic Characteristics of NDVI Values and Its Response to Climatic Factors in Western Sichuan Plateau

- Dynamic Characteristics of NDVI Values and Its Response to Climatic Factors in Western Sichuan Plateau
- Bulletin of Soiland Water Conservation Vol. 40, Issue 4, Pages: 286-294(2020)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2020.04.039
  CLC： X87;S157.2
- Published：2020
- 稿件说明：
移动端阅览
Xie Huijun, Zhang Tingbin, Yi Guihua, et al. Dynamic Characteristics of NDVI Values and Its Response to Climatic Factors in Western Sichuan Plateau[J]. Bulletin of Soiland Water Conservation, 2020, 40(4): 286-294.
DOI：

Xie Huijun, Zhang Tingbin, Yi Guihua, et al. Dynamic Characteristics of NDVI Values and Its Response to Climatic Factors in Western Sichuan Plateau[J]. Bulletin of Soiland Water Conservation, 2020, 40(4): 286-294. DOI： 10.13961/j.cnki.stbctb.2020.04.039.

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。

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.

关键词

Keywords

references

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