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草业学报 ›› 2018, Vol. 27 ›› Issue (3): 13-23.DOI: 10.11686/cyxb2017372

• 研究论文 • 上一篇    下一篇

柴达木盆地气候变化对植被的影响分析

李红梅   

  1. 青海省气候中心,青海 西宁 810001;
  • 收稿日期:2017-09-06 修回日期:2017-11-02 出版日期:2018-03-20 发布日期:2018-03-20
  • 作者简介:李红梅(1976-),女,山东曹县人,高级工程师,硕士。E-mail: 88104686@qq.com
  • 基金资助:
    国家重点研发计划项目(2016YFC0501903)资助

Analysis on the impact of climate change on vegetation in the Qaidam Basin

LI Hong-mei   

  1. Qinghai Climate Center, Xining 810001, China;
  • Received:2017-09-06 Revised:2017-11-02 Online:2018-03-20 Published:2018-03-20

摘要: 柴达木盆地地处青藏高原,全区年降水量仅为110 mm左右,生态环境比较脆弱。近年来受全球气候变暖的影响,柴达木盆地气温大幅升高,降水量明显增加,气候逐渐向暖湿化方向发展。基于柴达木盆地10个气象观测站1961-2016年逐月气温、降水等观测资料、GIMMS和MODIS 1982-2016年卫星遥感资料,利用线性趋势、综合顺序分类法等方法,分析了该地区不同区域和主要类型植被NDVI值多年变化趋势及其植被演替特征,结果表明,1982-2016年柴达木盆地四周高寒区和盆地内干旱荒漠区植被NDVI值均呈显著上升趋势,趋势系数分别为0.0090/10年、0.0011/10年;温性荒漠类、低地草甸类植被NDVI呈微弱增加趋势,趋势系数分别为0.0011/10年、0.0036/10年,而高寒草原类植被NDVI指数呈显著增加趋势,趋势系数为0.0058/10年。柴达木盆地气候极其干旱,水分是限制植被生长发育的主要因子,植被NDVI值与年降水量呈显著的正相关关系,与蒸发量呈显著的负相关关系。以气温发生突变的1987年为界,植被主要朝着温暖化和湿润化的方向发展。随着年代变化,寒温带植被类型逐渐减少,微温带植被类型逐渐增多,同时湿润度级别有所升高,尤其是进入21世纪以来,出现了微温微干和微温微润的植被类型。

Abstract: The Qaidam Basin is located on the Qinghai-Tibetan Plateau. The annual average precipitation is only about 110 mm. The ecological environment is extremely vulnerable. Under the context of global warming, temperature and precipitation have significantly increased in recent years, so the climate is gradually becoming warmer and more humid. The purpose of this study was to analyze vegetation dynamics using the NDVI (Normalized Difference Vegetation Index) and vegetation succession based on monthly temperature, precipitation, etc. in 10 meteorological stations in Qaidam Basin during 1961-2016, satellite remote sensing data from GIMMS (Global Inventory Modelling and Mapping Studies), and MODIS (Moderate-Resolution Imaging Spectroradiometer) data from 1982 to 2016. The linear trend analysis and comprehensive sequence classification methods were used to assess trends. The results showed that the NDVI increased significantly in the alpine area around the basin and the arid desert area in the basin during the period between 1982 and 2016 by 0.0090/10 yrs and 0.0011/10 yrs, respectively. The NDVI showed a slight increasing trend in temperate desert and lowland meadow vegetation; 0.0011/10 yrs and 0.0036/10 yrs, respectively, while the NDVI increased significantly in alpine meadow vegetation (0.0058/10 yrs). The climate is extremely arid in Qaidam Basin with water being the main factor limiting vegetation growth and development. The vegetation NDVI had a significant positive correlation with precipitation and a negative correlation with evaporation. The vegetation is gradually changing to species adapted to warm and moist conditions after the abrupt temperature increase in 1987.