Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Journal of Anhui Agricultural Sciences》 2010-05
Add to Favorite Get Latest Update

Environmental Changes Recorded by Lake Sediments from Hongjiannao Lake during Recent Fifty Years

LI Shuang et al(Key Laboratory of Western China's Environmental System(Ministry of Education),Lanzhou University,Lanzhou,Gansu 730000)  
Particle size,the contents of carbonate and organic matter were analyzed on lake sediments from a short core in Hongjiannao Lake to discuss the environmental changes during the past decades.On the basis of the records,the environmental changes in Hongjiannao Lake was approximately divided into 2 stages.In stage A(1957-1996),the lake evolution and the environmental change were mainly influenced by natural factors.It contains three sub-stages: A1(1957-1969),a period of lake expansion,A2(1969-1990),a stable period with high lake levels,and A3(1990-1996),a period of gradual extraction of the lake.In stage B(1996-2005),the lake area still keeps diminishing.During this period,organic matter increased rapidly due to the input of nutrient elements in the catchment.The carbonate content,however,decreased.As the precipitation was decreasing and the temperature was increasing,the decrease of carbonate content could not be explained by either temperature or precipitation change.
【Fund】: 国家自然科学基金(40871093)
【CateGory Index】: P343.3
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved