Effect of Hydrologic Alteration on the Community Succession of Macrophytes at Xiangyang Site, Hanjiang River, China

Table 3

Comparison results of the parameters of EFC in the three periods at Xiangyang site.

Parameters	Pre	Post			Relative alteration
		Post (all)	Post (1974–1990)	Post (1991–2013)	Post (all)	Post (1974–1990)	Post (1991–2013)
January low flow	354	857	971	754	1.42	0.13	1.13
February low flow	354	852	931	786.3	1.4	0.09	1.22
March low flow	551	830	883	770	0.51	0.06	0.40
April low flow	724	853	936.8	853	0.18	0.10	0.18
May low flow	826	988	1040	893	0.2	0.05	0.08
June low flow	582	949	1160	889.3	0.63	0.22	0.53
July low flow	761	1130	1245	1125	0.48	0.10	0.48
August low flow	767	1175	1270	1090	0.53	0.08	0.42
September low flow	887	1050	1220	947.5	0.18	0.16	0.07
October low flow	785	790	1050	719	0.01	0.33	−0.08
November low flow	624	764	941.5	749.5	0.23	0.23	0.20
December low flow	422	746	810.5	700	0.77	0.09	0.66
Extreme low peak	262	264	264	252	0.01	0	−0.04
Extreme low duration	11	2.5	4.5	1.75	−0.77	0.80	−0.84
Extreme low timing	45.5	48	60	22	0.05	0.25	−0.52
Extreme low counts	694	146	136	10	−1	−0.07	−0.99
High flow peak	2430	1530	1530	1520	−0.37	0	−0.37
High flow duration	5	3	3.5	3	−0.4	0.17	−0.40
High flow timing	182	201	200	205	0.1	0.00	0.13
High flow frequency	9	6	8	4	−0.33	0.33	−0.56
High flow rise rate	758	125	110	145.5	−0.83	−0.12	−0.81
High flow fall rate	−408	−110	−86.14	−126.2	−0.73	−0.22	−0.69
Small flood peak	19700	19500	19400		−0.01	−0.01	/
Small flood duration	28	39	46		0.39	0.18	/
Small flood timing	218	278	278		0.28	0.28	/
Small flood counts	42	9	9	0	−0.78	−0.78	/
Small flood rise rate	1408	4830	3250		2.43	−0.33	/
Small flood fall rate	−800	−532	−1165		−0.33	1.19	/
Large flood peak	37800				/	/	/
Large flood duration	49				/	/	/
Large flood timing	225.5		281		/	/	/
Large flood counts	4	0	0	0	/	/	/
Large flood rise rate	8814		4830		/	/	/
Large flood fall rate	−916		−532.2		/	/	/