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Table 5

Changes of annual streamflow by the change points (by the sequential MK test) of the six stations with the statistically decreasing trend at significance level 0.05

Station	Period	Year	Q_O^a (m³/s)	Qn^a (m³/s)
Zhuangqiao	Natural period	1956–1987	15.70	7.55
	Impacted period	1988–2000	5.15	5.43
	Change		10.55	2.12
Xuanwu	Natural period	1959–1986	7.53	7.50
	Impacted period	1987–2000	1.69	6.37
	Change		5.84	1.12
Mengcheng	Natural period	1956–1980	54.97	47.72
	Impacted period	1981–2000	18.23	34.03
	Change		36.74	13.69
Yongcheng	Natural period	1956–1980	5.26	5.36
	Impacted period	1981–2000	1.13	4.32
	Change		4.13	1.04
Linyi	Natural period	1958–1966	115.38	123.90
	Impacted period	1967–200	46.23	76.26
	Change		69.15	47.64
Daguanzhuang	Natural period	1958–1966	46.79	49.21
	Impacted period	1967–2000	25.99	36.03
	Change		20.80	13.19

Station	Period	Year	Q_O^a (m³/s)	Qn^a (m³/s)
Zhuangqiao	Natural period	1956–1987	15.70	7.55
	Impacted period	1988–2000	5.15	5.43
	Change		10.55	2.12
Xuanwu	Natural period	1959–1986	7.53	7.50
	Impacted period	1987–2000	1.69	6.37
	Change		5.84	1.12
Mengcheng	Natural period	1956–1980	54.97	47.72
	Impacted period	1981–2000	18.23	34.03
	Change		36.74	13.69
Yongcheng	Natural period	1956–1980	5.26	5.36
	Impacted period	1981–2000	1.13	4.32
	Change		4.13	1.04
Linyi	Natural period	1958–1966	115.38	123.90
	Impacted period	1967–200	46.23	76.26
	Change		69.15	47.64
Daguanzhuang	Natural period	1958–1966	46.79	49.21
	Impacted period	1967–2000	25.99	36.03
	Change		20.80	13.19