地理科学进展 ›› 2019, Vol. 38 ›› Issue (11): 1783-1792.doi: 10.18306/dlkxjz.2019.11.013

• 研究论文 • 上一篇    下一篇

黔桂喀斯特山区年NDVI变化的影响因素研究

刘梁美子1,2, 占车生1,*(), 胡实1, 张琦1,2   

  1. 1. 中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室,北京 100101
    2. 中国科学院大学,北京 100049
  • 收稿日期:2019-01-07 修回日期:2019-04-25 出版日期:2019-11-28 发布日期:2019-11-28
  • 通讯作者: 占车生 E-mail:zhancs@igsnrr.ac.cn
  • 作者简介:刘梁美子(1995— ),女,湖北黄冈人,硕士生,主要研究水文与水资源学。E-mail:liuliangmeizi17@mails.ucas.ac.cn
  • 基金资助:
    国家重点基础研究发展计划973计划项目(2015CB452701);国家自然科学基金项目(41571019);国家自然科学基金项目(51779009)

Impact factors of annual NDVI change in karst mountain areas of Guizhou and Guangxi Provinces

LIU Liangmeizi1,2, ZHAN Chesheng1,*(), HU Shi1, ZHANG Qi1,2   

  1. 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-01-07 Revised:2019-04-25 Online:2019-11-28 Published:2019-11-28
  • Contact: ZHAN Chesheng E-mail:zhancs@igsnrr.ac.cn
  • Supported by:
    National Key Basic Research Program of China (973 Program), No(2015CB452701);National Natural Science Foundation of China, No(41571019);National Natural Science Foundation of China, No(51779009)

摘要:

喀斯特山区是中国典型的生态脆弱区,区内的植被极易发生退化,且退化后难以恢复。论文采用逐步多元回归、相关性分析和残差分析等方法,探讨了黔桂喀斯特山区气候变化特征及其NDVI变化的影响因素。结果表明:2002—2015年研究区气候变化呈现暖湿化趋势,但变化并不显著,年降水量和年均温变化分别介于-15.6~25.6 mm/a和-0.08~0.06 ℃/a之间,年均增速分别为7.9 mm/a和0.000 35 ℃/a。过去14 a内,气候变化是影响NDVI变化的关键因素(贡献率约95%),其中降水对植被NDVI的影响大于气温。残差分析表明,近14 a来黔桂喀斯特山区NDVI残差和NDVI残差趋势的均值分别为0.03和0.0007/a,说明人类活动的正效应呈上升趋势。城市化的进程使得大量耕地、林地被建设用地占用,在毕节、安顺、贵阳以及河池、柳州、百色一带,人类活动对植被NDVI变化呈较明显的负效应,但是在六盘水、黔西南自治州、遵义和来宾,由于一系列生态还林工程的实施,人类活动则表现为正向影响。

关键词: 植被变化, 气候因子, 人类活动, 喀斯特山区

Abstract:

The karst mountain areas are typical ecologically fragile regions in China. The vegetation is highly prone to degradation and is difficult to recover after that. In this study, we explored the change trend of climatic factors and distinguished the impact factors of annual NDVI change in karst mountain areas, by using stepwise regression, correlation analysis, and residual analysis. From 2002 to 2015, a warm and humid trend was found in the study area, but not significant at the P=95% level. The average annual changes of precipitation and temperature are in the range of -15.6-25.6 mm/a and -0.08-0.06 ℃/a, with an increasing rate of 7.9 mm/a and 0.00035 ℃/a respectively at the regional scale. During the study period, climate variability was the dominating factor of NDVI changes, which accounted for 95% of the annual variations, and the impact of precipitation on NDVI was slightly greater than that of temperature. The residual analysis of NDVI showed that the mean values of NDVI residual and its trend were 0.03 and 0.0007/a in the last 14 years, indicating that the positive effects of human activities were present. Human activities such as urbanization caused a large amount of cultivated land and forest to be occupied by construction land, thus had obvious negative effects on NDVI changes in Bijie, Anshun, Guiyang, Hechi, Liuzhou, and Baise. However, due to the implementation of ecological rehabilitation and reforestation projects, human activities had positive effects on NDVI changes in Liupanshui, Qianxinan, Zunyi, and Laibin.

Key words: vegetation change, climatic factors, human activities, karst mountain areas