摘要
利用石羊河流域1959-2018年气象、水文和卫星遥感资料,采用线性倾向率、滑动t检验和相关系数(Pearson)等方法,分析石羊河流域内生态环境因素的变化事实及相互关系,得到气候变化对流域生态环境的影响程度。结果表明:石羊河流域气温呈显著上升趋势,增温速度为下游0.42℃·(10 a)>中游0.36℃·(10 a)>上游0.35℃·(10 a),近10 a增温最显著,较20世纪60年升高了1.67℃。四季气温均呈显著上升趋势,增温速度为冬季>秋季>春季>夏季。降水呈缓慢增加趋势,增幅为上游8.3 mm·(10 a)>中游7.0 mm·(10 a)>下游4.1 mm·(10 a),近10 a增加最显著,较20世纪60年代增加了17%。四季降水呈弱增加趋势,增加幅度为夏季>春季>秋季>冬季。河流流量基本持平,植被覆盖面积和归一化植被指数(NDVI)显著增大。近20 a流域气候暖湿化较显著,气候变化有利于增加本地水资源总量、提高地表植被覆盖率,对生态环境改善有积极作用。
Using meteorology,hydrology and satellite remote sensing data from the Shiyang River Basin during 1959-2018,by means of linear trend rate,moving t test and Pearson correlation coefficient methods,the changing facts and correlations of ecological environment factors were analyzed.The results showed that the temperature had a significant upward trend,with a warming rate of 0.42℃·(10 a)^(-1) in downstream,0.36℃·(10 a)^(-10 in midstream,and 0.35℃·(10 a)^(-1 )in upstream,respectively.The most significant warming occurred in the last 10 years,in which it was 1.67℃higher than the 1960s.The seasonal temperature showed a significant upward trend,and the warming rate was the fastest in winter,followed by autumn,spring and summer.The precipitation increased slowly,which was 8.3 mm·(10 a)^(-1) in upstream,7.0 mm·(10 a)^(-1) in midstream and 4.1 mm·(10 a)^(-1) in downstream,respectively.Precipitation in the last 10 years was 17%more than that in the 1960s.The increasing rate of seasonal precipitation was the fastest in summer,followed by spring,autumn and winter.The river flow was basically stable and the vegetation coverage and the normalized difference vegetation index(NDVI)increased significantly.The significant warming and humidification in the basin in the past 20 years was conducive to enhancing the total amount of local water resources,increasing the coverage of surface vegetation,and improving the ecological environment.
作者
罗晓玲
丁思聪
杨梅
李岩瑛
刘明春
LUO Xiaoling;DING Sicong;YANG Mei;LI Yanying;LIU Mingchun(Wuwei Meteorological Bureau,Wuwei 733000,China;School of Resources and Environment,Northeast Agricultural University,Haerbin 150006,China;Institute of Arid Meteorology,China Meteordogical Administration,Lanzhou 730020,China)
出处
《沙漠与绿洲气象》
2022年第4期49-56,共8页
Desert and Oasis Meteorology
基金
武威市市列科技计划项目(WW2101102)
国家自然科学基金面上项目(41975015)。
关键词
石羊河流域
气候变化
生态环境
水资源
植被覆盖
Shiyang River Basin
climate change
ecological environment
vegetation coverage
water resources
