All rivers in the Hexi inland region of Gansu Province, China, originate from the northern slope of the Qilian Mountains. They are located in the southern portion of the region and respectively belong to the three lar...All rivers in the Hexi inland region of Gansu Province, China, originate from the northern slope of the Qilian Mountains. They are located in the southern portion of the region and respectively belong to the three large river systems from east to west, the Shiyang, Heihe and Shule river basins. These rivers are supplied by precipitation, snowmelt and ice-melt runoff from the Qilian Mountain area. Therefore, changes of precipitation and temperature in the upstream watersheds of these rivers have an important effect on changes of mountainous runoff and reasonable utilization of water resources in this region. For this reason, the Qilian Mountain area, upstream watersheds and runoff forming areas of these rivers are chosen as the study area. The change characteristics and variation trend of temperature and precipitation in this area under the backdrop of global warming axe analyzed based on observa- tional data of relational weather and hydrologic stations in the area. Results show that temperatures in the upriver mountain areas of these three large river basins have been increasing, although the increasing degree is differentially affected by global warming. The rising extent of annual and seasonal temperatures in the upstream mountain area of the Shule river basin located in the west- em Qilian Mountains, were all largest over the past 50 years. Precipitation in the upstream mountain areas of Hexi region＇ three river basins located respectively in the western, middle and eastern Qilian Mountains have been presenting an increasing trend to varying degrees as a whole for more than 50 years. This means that climate in the upstream mountain areas of Hexi region＇ three river basins are becoming increasingly warmer and moister over the past 50 years, which will be very good for the ecological en- vironment and agricultural production in the region.展开更多
文章通过对河西地区最近150 ka河流阶地年龄数据的处理,发现存在7个明显的河流阶地发育时期,即150、100、70、40、30、12和6 ka B.P.。经过相关构造和气候资料的论证,文章认为,在150和70 ka B.P.附近形成的两级河流阶地代表了河西地区...文章通过对河西地区最近150 ka河流阶地年龄数据的处理,发现存在7个明显的河流阶地发育时期,即150、100、70、40、30、12和6 ka B.P.。经过相关构造和气候资料的论证,文章认为,在150和70 ka B.P.附近形成的两级河流阶地代表了河西地区两期主要的构造抬升,而在100、40、30、12和6 ka B.P.附近形成的5级河流阶地则对应于河西地区5期气候变化事件。展开更多
基金supported by the Open Foundation of Key Laboratory of Ecohydrology in Inland River Basin, Chinese Academy of Sciences and National Nature Science Foundation of China (No. 9112502)The Coupling and Modeling of Eco-hydrological Processes in the Upper Reaches of Heihe River (No. 91225302)+1 种基金Research of Eco-hydrological Response Units in Heihe River Basin Based on the Method of Concept Lattice (No. 41240002)System Behaviors and Regulation of Ecohydrological Processes in the Middle and Lower Heihe River Basin (91225301)
文摘All rivers in the Hexi inland region of Gansu Province, China, originate from the northern slope of the Qilian Mountains. They are located in the southern portion of the region and respectively belong to the three large river systems from east to west, the Shiyang, Heihe and Shule river basins. These rivers are supplied by precipitation, snowmelt and ice-melt runoff from the Qilian Mountain area. Therefore, changes of precipitation and temperature in the upstream watersheds of these rivers have an important effect on changes of mountainous runoff and reasonable utilization of water resources in this region. For this reason, the Qilian Mountain area, upstream watersheds and runoff forming areas of these rivers are chosen as the study area. The change characteristics and variation trend of temperature and precipitation in this area under the backdrop of global warming axe analyzed based on observa- tional data of relational weather and hydrologic stations in the area. Results show that temperatures in the upriver mountain areas of these three large river basins have been increasing, although the increasing degree is differentially affected by global warming. The rising extent of annual and seasonal temperatures in the upstream mountain area of the Shule river basin located in the west- em Qilian Mountains, were all largest over the past 50 years. Precipitation in the upstream mountain areas of Hexi region＇ three river basins located respectively in the western, middle and eastern Qilian Mountains have been presenting an increasing trend to varying degrees as a whole for more than 50 years. This means that climate in the upstream mountain areas of Hexi region＇ three river basins are becoming increasingly warmer and moister over the past 50 years, which will be very good for the ecological en- vironment and agricultural production in the region.
文摘文章通过对河西地区最近150 ka河流阶地年龄数据的处理,发现存在7个明显的河流阶地发育时期,即150、100、70、40、30、12和6 ka B.P.。经过相关构造和气候资料的论证,文章认为,在150和70 ka B.P.附近形成的两级河流阶地代表了河西地区两期主要的构造抬升,而在100、40、30、12和6 ka B.P.附近形成的5级河流阶地则对应于河西地区5期气候变化事件。
