As the first large scale reservoir, Guanting Reservoir plays a key role on water supply for BeijingThe reservoir kept healthy in the first decade and water quality has deteriorated since 1972 graduallyIn the following three decades, the water body undertook series pollutions, and dropped out from the source region of drinking water in 1997 The evolution of water quality in Guanting Reservoir in the past three decades was summarized based on the previous studiesSources and characteristics of the water pollution in Guanting Reservoir were discussed by stagesAt the same time, variations of main pollutants were also discussed The results show that the evolution process of water quality in Guanting Reservoir could be roughly divided into four stagesThe feature of first stage was organic toxicants and heavy metals pollution during 1972~1975The following stage was from 1981 to 1992,in which organic pollution played a main roleThe water pollution in third stage was a kind of complex pollution, which added bacteria pollutants during 1992~1995From 1996 till now, nitrogen and phosphorous pollution were the key features in Guanting ReservoirContents of COD and main heavy metals increased slowly during the past three decades, while contents of phenol varied In addition, contents of nitrogen and phosphorous increased steadily and significantly.
LIANG Tao, WANG Hao, DING Shi ming, XUE Jin feng, CAI Chun xia, ZHANG Xiu mei
. An Evolution of Water Quality in Guanting Reservoir During the Past Three Decades[J]. PROGRESS IN GEOGRAPHY, 2003
, 22(1)
: 38
-44
.
DOI: 10.11820/dlkxjz.2003.01.005