Inferences of the past annual runoff of the early and middle Holocene for Quzhou area, the southern Hebei Plain
Received date: 2003-03-03
Revised date: 2003-09-20
Online published: 2004-04-15
A relationship between mean annual temperature, mean annual precipitation and mean annual runoff was derived with the contemporary data for 30 small catchments in northern China. With the relationship between magnetic susceptibility and climatological variables and between oxygen isotopic compositions and climatological variables established by other investigators, the past annual-temperature and annual-precipitation of the early and middle Holocene were inferred for Quzhou area situated in the southern Hebei Plain from the previously measured magnetic susceptibility and carbonate oxygen isotopic composition of sediments sampled in an inter-channel depression in this area. With the derived relationship between mean annual temperature, mean annual precipitation and mean annual runoff, the corresponding past annual-runoff of the early and middle Holocene was inferred for this area from the so inferred annual-temperature and annual-precipitation. During >10,210-10,000 yr BP, the annual runoff was abundant and apparently more than nowadays. It was relatively spare, being probably less than, roughly the same to or still more than during the contemporary time in 10,000-8,500 yr BP. In 8,500-8,000 yr BP, the annual runoff was again remarkably more than that in the modern time. It was relatively rare again during 8,000-7,200 yr BP. From 7,200 yr BP onwards, the annual runoff tended to increase and was extremely abundant at ～6,700 or 6,500 yr BP when it might be 2.4, 3.4, 4.1 or even 5.0 times more than today. After ～6,000 yr BP, it began to gradually decrease. The general trend of variations in annual runoff inferred for Quzhou area is generally similar to those inferred by other investigators for other parts of the Hebei Plain. However, the comparison of our estimates with those of other investigators indicates that the surface water was much more abundant in Quzhou area than in other parts of the Hebei Plain during the mid-Holocene (7500-5500 yr BP).
Key words： the southern Hebei; Quzhou, the Holocene; annual runoff
WANG Hong-ya, SHI Yuan-chun, WANG Mei-hua, XIE Qiang, HAO Jin-min, LI Liang . Inferences of the past annual runoff of the early and middle Holocene for Quzhou area, the southern Hebei Plain[J]. GEOGRAPHICAL RESEARCH, 2004 , 23(2) : 183 -191 . DOI: 10.11821/yj2004020006
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