NDVI等级年份	−0.3, 0	0.000001, 0.2		0.2, 0.4		0.4, 0.6		0.6, 0.8		0.8~1.0
NDVI等级年份	像元数	像元数	%	像元数	%	像元数	%	像元数	%	像元数	%
2002	665788	9379	1.5341	64667	10.578	379031	61.998	154558	25.281	3722	0.609
2003	665396	5377	0.8790	27606	4.513	124042	20.277	398692	65.172	56032	9.159
2004	665854	5149	0.8423	16344	2.674	89899	14.706	440474	72.056	59425	9.721
2005	665439	5402	0.8831	18662	3.051	147705	24.146	385490	63.019	54447	8.901
2006	666445	5395	0.8834	33609	5.503	147488	24.151	346499	56.738	77709	12.725
2007	665536	4519	0.7389	14620	2.390	65217	10.663	420971	68.829	106290	17.379
2008	666419	4074	0.6671	15500	2.538	93605	15.327	367446	60.165	130101	21.303
2009	666577	3963	0.6491	20951	3.432	91803	15.036	423187	69.310	70664	11.573
2010	666250	4468	0.7314	24538	4.017	174277	28.528	348496	57.047	59116	9.677
2011	666141	4304	0.7044	36299	5.941	174987	28.639	313615	51.328	81799	13.388