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中国沙漠 ›› 2022, Vol. 42 ›› Issue (4): 229-241.DOI: 10.7522/j.issn.1000-694X.2022.00095

• • 上一篇    

中亚草地植被指数( NDVI )对气候变化及人类活动的响应

朱士华1,2(), 方霞3,4(), 杭鑫1, 谢小萍1, 孙良宵1, 曹良中4,5   

  1. 1.江苏省气候中心/江苏省气象局,江苏 南京 210008
    2.南京大学 国际地球系统科学研究所,江苏 南京 210093
    3.新疆工程学院,新疆 乌鲁木齐 830023
    4.中国科学院新疆生态与地理研究所 荒漠与绿洲生态国家重点实验室,新疆 乌鲁木齐 830011
    5.九江大学,江西 九江 332005
  • 收稿日期:2022-03-22 修回日期:2022-06-01 出版日期:2022-07-20 发布日期:2022-08-29
  • 通讯作者: 方霞
  • 作者简介:方霞(E-mail: xiafangxj@163.com
    朱士华(1989—),男,山东临沂人,博士,主要从事全球变化与生态系统碳循环研究。E-mail: zhu_shihua2021@163.com
  • 基金资助:
    新疆自然科学基金项目(2019D01A31);江苏省气象局青年基金项目(KQ202217);国家自然科学基金项目(41861018);国家重点研发计划项目(2018YFC1506500);江苏省碳达峰碳中和科技创新专项(BE2022612);江苏省气象局重点科研项目(KZ202206);新疆高校科研计划自然科学项目(XJEDU2020Y41)

Normalized difference vegetation indexNDVIdynamics of grassland in Central Asia and its response to climate change and human activities

Shihua Zhu1,2(), Xia Fang3,4(), Xin Hang1, Xiaoping Xie1, Liangxiao Sun1, Liangzhong Cao4,5   

  1. 1.Jiangsu Climate Center / Jiangsu Meterological Bureau,Nanjing 210008,China
    2.International Institute for Earth System Science,Nanjing University,Nanjing 210093,China
    3.Xinjiang Institute of Engineering,Urumqi 830023,China
    4.State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China
    5.Jiujiang University,Jiujiang 332005,Jiangxi,China
  • Received:2022-03-22 Revised:2022-06-01 Online:2022-07-20 Published:2022-08-29
  • Contact: Xia Fang

摘要:

中亚草地植被对气候变化和人类活动响应十分敏感,但气候变化和人类活动对草地植被变化的相对贡献仍不确定。本文基于3套气象数据集及归一化植被指数(Normalized Difference Vegetation Index, NDVI)数据,利用残差分析方法,研究中亚草地NDVI变化格局及气候变化和人类活动的相对贡献。结果表明:1982—2014年中亚草地NDVI增长幅度为0.026/10a;空间上,NDVI与降水变化格局对应,呈现中西部下降而东部丘陵山区上升趋势。残差分析表明气候变化(CFSR数据,Climate Forecast System Reanalysis)相对贡献占71.21%,人类活动相对贡献占28.79%。人类活动对NDVI贡献较大的区域主要分布在阿尔泰山区、天山山区及哈萨克斯坦东南部草原,贡献较小的区域主要分布在南疆地区以及中亚中西部荒漠区。中亚绝大多数地区草地NDVI与降水呈显著正相关,而增温的促进作用主要发生在高纬、高寒山区。NDVI与气温相关性呈逐渐降低趋势,尽管未来全球性增温依然是中亚草地面临的巨大挑战,但随着草地植被抗逆性的提高,增温对草地的影响可能不会如预期那么严重。

关键词: 草地动态, 气候变化, 人类活动, 成因分析, 时空特征

Abstract:

Dryland grasslands in Central Asia are threatened by climate change and human activities, but their relative contribution to grassland changes is still uncertain. Based on three sets of meteorological data and NDVI (Normalized Difference Vegetation Index), this paper uses the residual analysis to study the grassland change pattern in Central Asia and the relative contributions of environmental and human factors. The results showed that the NDVI growth rate of grassland in Central Asia was 0.026/10a during 1982 to 2014. Spatially, the NDVI variations were similar to that of precipitation, showing a downward trend in the central and western regions and an upward trend in the hilly and mountainous regions of the east. The residual analysis shows that the relative contribution of climate change (CFSR, Climate Forecast System Reanalysis) and human activities account for 71.21% and 28.79%, respectively. The areas where man-made disturbances contribute more to NDVI changes are mainly located in the Altay Mountains, Tianshan Mountains and the grasslands of southeastern Kazakhstan, while the less contribution areas are mainly located in the southern Xinjiang and the desert regions of Central Asia. In most areas of Central Asia, grassland has a significant positive correlation with precipitation, and the warming promotion mainly occurs in high-latitude and alpine mountainous areas. The correlation between NDVI and temperature is gradually decreasing. Although global warming is still a huge challenge for Central Asian grasslands in the future, with the improvement of grassland vegetation resistance, the impact of warming on grasslands may not be as severe as expected.

Key words: grassland dynamics, climate change, human activities, driver analysis, temporal and spatial characteristics

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