Shoal exposure caused by water level drop in the middle reaches of the Yangtze River and its potential impact on stickiness spawning fish： a case study in spring 2020
YANG Fan1， 2， HE Baoyin1， 2， FENG Qi1， 2， XIAO Fei1， 2， BAN Xuan1， 2， TU Shiping3， SHU Wei4
(1.Innovation Academy for Precision Measurement Science and Technology， Chinese Academy of Sciences， Key Laboratory of Environment and Disaster Monitoring and Evaluation， Wuhan 430071， China；2.University of the Chinese Academy of Sciences， Beijing 100049， China；3.Wuhan Ecological Environment Bureau， Wuhan 430022， China；4.Qingdao Economic and Technological Development Zone Management Committee， Qingdao 266425， Shandong， China)
Abstract：In the spring of 2020， there was an abnormal phenomenon of low water level in the middle and upper reaches of the Yangtze River. By collecting the precipitation in the middle and upper reaches of the Yangtze River and the hydrological information of the Three Gorges Reservoir， the process and reason of the water level decline in the middle reaches of the Yangtze River in the spring of 2020 wer analyzed. At the sametime， satellite remote sensing technology is used to investigate the large area of shoal exposure in the Chenglingji reach， Poyang Lake and Dongting Lake caused by the water level decline of the Yangtze River. Finally， the potential effects of these changes on the reproduction of stick-producing fish were discussed. The results are shown as follows. 1) The decrease of rainfall in the spring of 2020 in the middle and upper reaches of the Yangtze River is the main reason for the water level decrease. 2) The decrease of water level in the main stream of the middle reaches of the Yangtze River resulted in the shoal outcrop area of Poyang Lake and Dongting Lake reaching 670 km2 and 480 km2 respectively， which might have a systematic and profound effect on the reproduction of fishes. 3) It's suggested that related departments should pay close attention on the dynamic changes of the viscid egg spawing fish resources and strengthen the monitoring and evaluation. At the same time， the joint scheduling of the Three Gorges of the Yangtze River and the upstream cascade reservoirs need take into full account the natural breeding habits of viscid egg spawing fish in the middle and lower reaches and develop a more reasonable scheme is required to be devoloped in order to maximize the protection of fish resourses in the Yangtze River.
杨 帆,何报寅,冯 奇,肖 飞,班 璇,涂世平,舒 炜. 长江中游水位下降引起的浅滩出露及其对产粘性卵鱼类繁衍的潜在影响探讨——以2020年春季为例[J]. 华中师范大学学报(自然科学版), 2022, 56(2): 354-362.
YANG Fan,HE Baoyin,FENG Qi,XIAO Fei,BAN Xuan,TU Shiping,SHU Wei. Shoal exposure caused by water level drop in the middle reaches of the Yangtze River and its potential impact on stickiness spawning fish： a case study in spring 2020. journal1, 2022, 56(2): 354-362.
2022, Vol. 56 
