摘要
近些年来,达里湖的萎缩已经引起了严重的生态问题。为了揭示达里湖萎缩的具体原因,对达里湖进行了沉积岩芯(DL-1)和古湖岸线剖面采集,通过210Pb、137Cs和光释光(OSL)精确定年,基于Mg/Ca和Ti重建了达里湖流域过去200多年环境演变,并结合近40年流域的遥感、气象和社会经济数据等进行了分析。结果表明:达里湖面积从1768年的332.46 km^(2)减少至2016年的185.0 km^(2),减少了44.35%;1800—1906年,达里湖流域处于冷干气候;1906年以后,达里湖流域经历暖湿-暖干交替变化;200多年以来,降雨强度变化与湖面变化具有较好的一致性,说明气候变化是达里湖面积萎缩的主要因素;2009年以来,蒸发量与湖面面积变化呈正相关(P=0.01,R2=0.872),这与强烈蒸发引起湖面萎缩相矛盾,指示了该时期人类活动对湖面萎缩的影响较大。
In recent years,the shrinkage of Dali Lake has caused serious ecological problems.To reveal the reasons for its shrinkage,the sedimentary core(DL-1)and the paleo-lake shoreline profile of Dali Lake were collected.Based on210 Pb,137 Cs,and optically stimulated luminescence(OSL)dating,the environmental evolution of Dali Lake Basin in the past 200 years was reconstructed by Mg/Ca and Ti.Further,combined with remote sensing,meteorological and socio-economic data of the basin over the past 40 years,the lake-level changes were analyzed.The results showed that the area of Dali Lake had decreased by 44.35%,from 332.46 km^(2) in 1768 to 185.0 km^(2) in 2016.There was a cold and dry climate from 1800 to 1906,and then a warm-wet and warmdry alternation.For more than 200 years,the change of rainfall intensity was consistent with the change of lake level,indicating that climate change was the main factor for lake shrinkage.Since2009,there was a positive correlation between evaporation and lake level(P=0.01,R2=0.872),which was contradictory to the expectation that lake level shrinkage is caused by strong evaporation,indicating that human activities have a great influence on the lake level changes in this period.
作者
甄志磊
徐立帅
张俊
王春玲
张鑫
ZHEN Zhi-lei;XU Li-shuai;ZHANG Jun;WANG Chun-ling;ZHANG Xin(College of Urban and Rural Construction,Shanxi Agricultural University,Taigu 030801,Shanxi,China;College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,Shanxi,China;The Management Center of River and Lake System of Shanxi Province,Taiyuan 030002,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2021年第10期3314-3324,共11页
Chinese Journal of Ecology
基金
国家自然科学基金项目(51709162)
山西省优秀博士来晋工作奖励项目(SXYBKY20174)资助。
关键词
沉积岩芯
古湖岸线
遥感数据
面积
达里湖
sedimentary core
ancient shoreline
remote sensing data
lake area
Dali Lake
作者简介
甄志磊,男,1987年生,博士,副教授,主要研究方向为水环境演变和水污染控制。E-mail:zhencheng7666@163.com;通讯作者:徐立帅,E-mail:sdyixu@126.com。
