干旱气象 ›› 2023, Vol. 41 ›› Issue (5): 697-704.DOI: 10.11755/j.issn.1006-7639(2023)-05-0697

• 论文 • 上一篇    下一篇

石羊河流域干湿气候变化特征及对NDVI的影响

张金丹1,2(), 刘明春2, 李兴宇2, 丁文魁2, 杨华2, 蒋菊芳2()   

  1. 1.中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室/中国气象局干旱气候变化与减灾重点实验室,甘肃 兰州 730020
    2.甘肃省武威市气象局/武威国家气候观象台,甘肃 武威 733000
  • 收稿日期:2023-03-28 修回日期:2023-07-06 出版日期:2023-10-31 发布日期:2023-11-03
  • 通讯作者: 蒋菊芳(1979—),女,硕士,高级工程师,主要从事农业与生态气象业务和科研工作。E-mail: wwqxjjf@163.com
  • 作者简介:张金丹(1995—),女,硕士,助理工程师,主要从事农业与生态气象业务和科研工作。E-mail: zhangjd9522@163.com
  • 基金资助:
    国家自然基金项目(42175192);甘肃省气象局重点项目(Zd2021-02);干旱气象科学研究基金项目(IAM202213);科技特派员专题项目(WW2201RPT050);甘肃省自然科学基金“基于干旱过程的甘肃省干旱危险性及其传递阈值研究”(21JR7RA698)

Characteristics of dry-wet climate change and its influence on NDVI in Shiyang River Basin

ZHANG Jindan1,2(), LIU Mingchun2, LI Xingyu2, DING Wenkui2, YANG Hua2, JIANG Jufang2()   

  1. 1. Institute of Arid Meteorology, China Meteorological Administration/ Gansu Province Key Laboratory of Arid Climate Change and Disaster Reduction/Key Open Laboratory of Arid Climate Change and Disaster Reduction, China Meteorological Administration, Lanzhou 730020, China
    2. Wuwei Meteorological Bureau of Gansu Province/Research Project of Wuwei National Climatological, Wuwei 733000, Gansu, China
  • Received:2023-03-28 Revised:2023-07-06 Online:2023-10-31 Published:2023-11-03

摘要:

全球变暖背景下,研究石羊河流域干湿气候变化特征及对植被覆盖度的影响对该流域的生态环境建设具有重要参考价值。基于1971—2020年石羊河流域的降水温度均一化指数(S),从干旱站次比、干旱频率等方面分析该流域干湿气候的时空变化,并结合归一化植被指数(Normalized Differential Vegetation Index,NDVI)遥感数据,分析干湿变化对NDVI的影响。结果表明:近50 a来石羊河流域年际和季的S指标呈波动上升趋势,四季中,夏季湿润化速度最快。流域干旱程度、干旱发生区域均呈减小趋势;中下游地区干旱强度高于上游地区,下游地区干旱频率高于中上游地区;年NDVI随着1—10月干旱减轻、降水量增多和气温降低而增加,其中,植被生长前期和中期降水量、生长中期气温对年NDVI影响较大。2月、5月和7月,NDVI对干旱存在滞后效应。

关键词: 降水温度均一化指数, 干湿气候特征, 归一化植被指数, 石羊河流域

Abstract:

Under the background of global warming, studying the characteristics of dry-wet climate changes in the Shiyang Rive Basin and their influence on vegetation coverage has significant importance for the ecological environment construction of the basin. Based on the precipitation temperature homogenization index (S) in the Shiyang River Basin from 1971 to 2020, the spatial-temporal changes of the dry-wet climate in the basin were analyzed from the aspects of drought station frequency ratio, drought frequency, and more. Combined with the Normalized Differential Vegetation Index (NDVI) remote sensing data, the influence of dry-wet change on NDVI was analyzed. The results showed that the inter-annual and seasonal S indices showed an increasing trend in the Shiyang River Basin over the past 50 years, with the most pronounced increase in summer. The drought degree and drought occurrence area have shown a decreasing trend in the basin. The intensity of drought in the midstream and downstream were more severe compared to the upstream, with higher drought frequencies in the downstream. The annual NDVI increased with the alleviation of drought, the increase of precipitation and decrease of temperature. The precipitation in the early and middle period of growth, as well as the temperature in the middle period had a great influence on the annual NDVI. In February, May and July, the NDVI had a lag effect in response to drought.

Key words: precipitation temperature homogenization index, characteristics of dry-wet climate, NDVI, the Shiyang River Basin

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