Analysis of the Changes in the Water Yield Coefficient over the Past 50 Years in the Huang-Huai-Hai River Basin, China

Table 1

Land use/cover change.

Classification	Land use type	Area in 1980 (km^2)	Proportion in 1980	Area in 2005 (km^2)	Proportion in 2005	Area of change (km^2)	Percentage change (%)
	1: arable land	86139	68.47	87052	69.20	912.69	1.06
	2: woodland	8911	7.08	9144	7.27	233.07	2.62
	3: grassland	11172	8.88	8269	6.57	−2902.49	−25.98
	4: water	4485	3.57	5460	4.34	974.70	21.73
	5: urban land	14146	11.25	15596	12.40	1449.19	10.24
	6: unused land	947	0.75	280	0.22	−667.16	−70.43
	SUM	125801	100.00	125801	100.00	0.00
	1: Arable land	91549	67.37	91330	67.21	−218.95	−0.24
	2: woodland	3840	2.83	4207	3.10	366.40	9.54
	3: grassland	13248	9.75	10939	8.05	−2309.45	−17.43
	4: water	6078	4.47	6062	4.46	−15.77	−0.26
	5: urban land	16161	11.89	18168	13.37	2006.70	12.42
	6: unused land	5008	3.69	5179	3.81	171.07	3.42
	SUM	135884	100.00	135884	100.00	0.00
	1: arable land	115898	31.69	113976	31.17	−1921.66	−1.66
	2: woodland	50051	13.69	50148	13.71	96.99	0.19
	3: grassland	155794	42.60	153464	41.97	−2329.74	−1.50
	4: water	7410	2.03	7622	2.08	211.96	2.86
	5: urban land	11694	3.20	14485	3.96	2790.55	23.86
	6: unused land	24846	6.79	25998	7.11	1151.90	4.64
	SUM	365693	100.00	365693	100.00	0.00
	1: arable land	152048	34.40	149145	33.74	−2903.07	−1.91
	2: woodland	60610	13.71	63893	14.45	3283.34	5.42
	3: grassland	176258	39.87	172955	39.13	−3302.33	−1.87
	4: Water	8145	1.84	8249	1.87	104.24	1.28
	5: urban land	10975	2.48	13936	3.15	2961.19	26.98
	6: unused land	34013	7.69	33870	7.66	−143.37	−0.42
	SUM	442048	100.00	442048	100.00	0.00
	1: arable land	161018	45.98	157066	44.85	−3951.33	−2.45
	2: woodland	60383	17.24	64629	18.45	4245.78	7.03
	3: grassland	98911	28.24	93267	26.63	−5644.73	−5.71
	4: water	7479	2.14	8177	2.33	697.39	9.32
	5: urban land	15471	4.42	20370	5.82	4898.15	31.66
	6: unused land	6945	1.98	6700	1.91	−245.26	−3.53
	SUM	350208	100.00	350208	100.00	0.00