16 29 km ,, t, 1.56 t 71.2%, ( 1) 4511km , 144 /km %,, t [16],, t,, t, 9.2 km 2

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1 PROGRESS IN GEOGRAPHY Vol.29, No.1 Jan., ,2 1 1,2 1,2 ( ; ) : , : t/a 91.2% ; t/a 14.1%, 39.8% 46.2% t/a 74.7% ; t/a t/a 81.4% ; t/a 29.6% 42.1%, 23.4% 4.9% : ; ; ; 1,,,, ; 1984,,, [1-4] [5-6] [7-9], [10-12], [13-15] 1982, : ; : (2007SHZ ) : (1983-), : (1963-) shicx@igsnrr.ac.cn 015~022

2 16 29 km ,, t, 1.56 t 71.2%, ( 1) 4511km , 144 /km %,, t [16],, t,, t, 9.2 km t( ) 10.3% t 43.7% 26.1% ( ) 35.1% 94.6%,, ;, %,, ( ) % % t 92% 8% km 2, t( ) , Mann-Kendall 0.01,,, , t, 58.4%, % 1.79 t 81%, 1, Fig.1 The upper Yangtze River drainage basin

3 1 : 17 Mann-Kendall, , 3a ,, -,, -, ; 1982, [13-14], 2000, 40-50, 2000 [17-19]

4 , , , , (Qw)- (Qs), P 0.05 P 0.01: 3 b ( ): c -, Q s =3586.2e Q w R 2 = ( ): - ( 3 ), Q s =1018.5e Q w R 2 =0.7484

5 1 : 19 ( ): Q s =221.11e Q w R 2 = ( ): Q s =3864.6e Q w R 2 = ( ): Q s =7370.4e Q w R 2 = ( ): Q s =2536.3e Q w R 2 = ( ): Q s =13297e Q w R 2 = ( ): Q s =5389.3e Q w R 2 = ( ): Q s =13.691e Q w R 2 =0.9426,, t/a , %, [22] ;, 2000 ( 21.25%, ), 1989 ;, ( ) ;, ( ) 4%(56.4 m 3 /a), 20.3% (0.480 t/a) 25.3% [13-14,20-21] ( ) 5%(74.9 m 3 /a), , t [21] 10.7% 1 ( t/a %) Tab.1 Sediment decrease in monitoring periods at main hydrological stations in the upper Yangtze River (Unit: 100 million tons per year, %)

6 , t, 23.4% 21, 5410 t 42.1% km % 4.3.3,90 ( ) 1.43 t ( ) t 27.7% ( ) 21.4% %(51.7 m 3 /a) 53.0%(0.827 t/ a) ; ( ), 82.5%(1.285 t/a), 8050 t 56.3%; ( ) t [26] 34.5%, 80, t, [23] %; 15.7% - 7.6%, 8.8%, 81.4% 70.4% 4.7% 4.9%, 39.8%; %, ; t/a [24] 18.9% ; , , 36.0% 21.6% : 42.4%, - [25] ( ) t/a ; ( ) 4.50 t/a, 3010

7 1 : , 263: ( ) [9] Chen Zhongyuan, Li Jiufa, Shen Huanting. Yangtze River 0.48 t/a of China: historical analysis of discharge variability and sediment flux. Geomorphology, 2001, 41(2-3): ( ) t/a [10] Walling DE, Fang D. Recent trends in the suspended sediment loads of the world s rivers. Global and Planetary Change, 2004, 39(1-2): ( ) [11] Zhang Qiang, Xu Chongyu, Becker Stefan. Sediment and t/a runoff changes in the Yangtze River basin during past 50, years. Journal of Hydrology, 2006, 331: ( ) [12]., 2008, 27 (4): [13]..,2002, 4: [14]..,2008, 27(2): [1] Zhu Y M, Lu X X, Zhou Y. Sediment flux sensitivity to [15]. climate change: A case study in the Longchuanjiang., 2004, 15(4): catchment of the upper Yangtze River, China. Global and [16]. Planetary Change, 2008, 60(3-4): ( ). : [2] Wilkinson, B H, McElroy, et al. The impact of humans on, continental erosion and sedimentation. Geological Society [17],. of America Bulletin, 2007, 119(1-2): ,2005, 36(1): [3] Xu J X. The water fluxes of the Yellow River to the sea in [18],. the past 50 years, in response to climate change and human activities. Environmental Management, 2005, 35 (5):., 2008, 25(2): [19] , 2005,14(5): [4] Dai S B, Yang S L, Li M. The sharp decrease in suspended sediment supply from China's rivers to the sea: anthro- [20] Lu X X. Spatial variability and temporal change of water discharge and sediment flux in the lower Jinsha tributary: pogenic and natural causes. Hydrological Sciences Journal-Journal -des Sciences Hydrologiques, 2009, 51 (1): impact of environmental changes. River research and applications, 2005, 21: [21]. [5] Lu X X, Higgitt D L. Recent Changes of Sediment Yield., 2008,19(4): in the Upper Yangtze, China. Environmental Management, [22]. 1998, 22(5): ( ), [6] Lu X X, Higgitt. D L. Sediment yield variability in the 2008, 40(6): upper Yangtze, China. Earth Surface Process and Land- [23],.. forms, 1999, 24(12): [7] Xu Kehui, Milliman J D. Seasonal variations of sediment discharge from the Yangtze River before and after impoundment of the Three Gorges Dam. Geomorphology, 2009, 104(3-4): 1-8. [8] Yang Shilun, Zhao Qingying, Belkin IgorM. Temporal variation in the sediment load of the Yangtze River and the influences of human activities. Journal of Hydrology,, 2007, 25(2): [24],,,.., 2008, 4(2): 1-8. [25].., 2006, 24(4): 385~394. [26],,.., 2006, 61(5):

8 22 29 Impact of Human Activities on Recent Changes in Sediment Discharge of the Upper Yangtze River DU Jun 1,2, SHI Changxing 1, ZHANG Shouhong 1,2, ZHANG Luan 1,2 (1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing , China; 2. Graduate School of Chinese Academy of Sciences, Beijing , China) Abstract: The upper Yangtze River is the main sediment source of the Yangtze River basin and its sediment yield is closely related with its ecological environment. In recent decades, as human activities intensified strongly, sediment yield in the upper Yangtze River underwent profound changes. Using annual runoff-sediment records in the period of , this paper made a quantitative analysis of characteristics and causes of changes in sediment discharge of main stream and tributaries of the upper Yangtze River in different periods based on double mass curves and empirical models. Our findings are: 1. The relationship between runoff and sediment load of the main stream and tributaries of the upper Yangtze River had obvious phase characteristics, which reflected the impacts of different kinds and intensities of human activities on fluvial sediment yield and transport. The sediment discharge of the upper Yangtze River in reduced 143 million tons per year and the contribution from human activities accounted for 91.2%. The main decrease was from the Jialing River. The sediment load in was lowered by 450 million tons per year, of which 14.1% was induced by the reduction of runoff, 39.8% by sustaining human activities appearing in the earlier period, and 46.2% by sediment trapping in the Three Gorges Reservoir and by the decrease of sediment load in the Jinsha River. 2. The sediment discharge of the Jinsha River in the period of increased by 48 million tons per year, of which 74.7% was associated with human activities, mainly construction of projects. In the period of , the annual sediment load of the Jinsha River was reduced by million tons per year, all due to human activities, including various types of reservoirs among which Ertan Reservoir was the biggest one, soil and water conservation practices and decrease of sediment yield from construction projects. 3. The sediment load of the Jaling River decreased by 82.7 million tons per year in , of which 81.4% was related to human activities, such as the changes in rural socio-economic factors and construction of reservoirs. The reduction of sediment load reached million tons per year in the period of , of which the decrease of natural runoff accounted for 29.6%, the sustaining human activities appearing in the earlier period for 42.1%, the newly-built reservoirs, such as Baozhusi reservoir, and soil and water conservation project for 23.4%, and human-induced runoff reduction for 4.9%. Key words: upper Yangtze River; sediment discharge variation; period division;influencing factors :.., 2010,29(1):15-22.

m 3 /a t /a m 3 /a t /a 4 t 6 t 8 t t 10 t 8 t 3

m 3 /a t /a m 3 /a t /a 4 t 6 t 8 t t 10 t 8 t 3 2010 4 SHUILI XUEBAO 41 4 0559-9350 2010 04-0379-11 Ⅱ 100048 2050 20082050 10. 22 ~ 18. 08 t /a 3. 46 ~ 6. 24 t /a 254 t 1. 74 ~ 2. 57 /a 531. 06 t 5. 07 ~ 5. 94 t /a 3. 42 ~ 5. 45 t /a 192. 1 t 0. 34