TABLE 3.

Measurement data of the three quality grades of Maidong in the middle sampling site.

Sample no.	Ⅰa	Ⅱb	Ⅲc	Ⅲ/Ⅰd	Sample no.	Ⅰ	Ⅱ	Ⅲ	Ⅲ/Ⅰ
Z1-1	81,090	358,251	277,161	3.42	CP2-1	469,260	814,575	345,315	0.74
Z1-2	47,258	253,918	206,660	4.37	CP2-2	338,453	642,992	304,539	0.90
Z1-3	36,115	250,914	214,799	5.95	CP2-3	388,940	662,765	273,825	0.70
Z1-4	188,958	635,295	446,337	2.36	CP2-4	518,334	858,267	339,933	0.66
Z2-1	170,782	512,002	341,220	2.00	CP3-1	604,054	961,707	357,653	0.59
Z2-2	114,201	454,009	339,808	2.98	CP3-2	673,572	1,160,622	487,050	0.72
Z2-3	116,845	380,068	263,223	2.25	CP3-3	626,398	993,179	366,781	0.59
Z2-4	24,675	215,227	190,552	7.72	CP3-4	917,850	1,364,305	446,455	0.49
Z3-1	157,485	470,416	312,931	2.00	CP4-1	870,824	1,253,498	382,674	0.44
Z3-2	29,963	182,158	152,195	5.08	CP4-2	636,175	958,408	322,233	0.51
Z3-3	96,574	376,058	279,484	2.89	CP4-3	540,641	865,545	324,904	0.60
Z3-4	107,117	392,831	285,714	2.67	CP4-4	293,372	559,209	265,837	0.91
Z4-1	145,391	476,613	331,222	2.28	CP5-1	515,175	958,198	443,023	0.86
Z4-2	126,981	382,109	255,128	2.00	CP5-2	341,307	592,817	251,510	0.74
Z4-3	165,293	496,785	331,492	2.00	CP5-3	494,032	857,986	363,954	0.74
Z4-4	115,890	453,956	338,066	2.92	CP5-4	264,706	499,548	234,842	0.89
C1-1	224,075	509,474	285,399	1.27	CP6-1	443,379	799,688	356,309	0.80
C1-2	255,424	534,656	279,232	1.10	CP6-2	408,180	743,671	335,491	0.82
C1-3	227,877	526,606	298,729	1.31	CP6-3	280,642	550,861	270,219	0.96
C1-4	140,699	373,350	232,651	1.65	CP6-4	679,345	979,165	299,820	0.44
C2-1	285,660	634,466	348,806	1.22	CP7-1	471,043	829,813	358,770	0.76
C2-2	374,893	799,515	424,622	1.13	CP7-2	437,266	785,005	347,739	0.80
C2-3	383,775	830,247	446,472	1.16	CP7-3	592,120	970,300	378,180	0.64
C2-4	334,601	660,323	325,722	0.97	CP7-4	336,881	645,655	308,774	0.92
C3-1	230,592	571,813	341,221	1.48	CP8-1	298,457	586,455	287,998	0.96
C3-2	210,726	522,545	311,819	1.48	CP8-2	363,258	654,104	290,846	0.80
C3-3	368,176	802,156	433,980	1.18	CP8-3	785,879	1,155,160	369,281	0.47
C3-4	299,166	659,963	360,797	1.21	CP8-4	721,453	1,012,287	290,834	0.40
C4-1	197,351	460,312	262,961	1.33	CP9-1	769,307	1,174,854	405,547	0.53
C4-2	210,724	490,761	280,037	1.33	CP9-2	746,678	1,166,125	419,447	0.56
C4-3	160,184	421,191	261,007	1.63	CP9-3	978,576	1,374,474	395,898	0.40
C4-4	258,882	532,082	273,200	1.06	CP9-4	1,114,243	1,606,081	491,838	0.44
CP1-1	583,132	1,005,278	422,146	0.72	CP10-1	465,625	802,405	336,780	0.72
CP1-2	951,800	1,665,864	714,064	0.75	CP10-2	525,828	933,723	407,895	0.78
CP1-3	329,114	543,816	214,702	0.65	CP10-3	387,022	674,291	287,269	0.74
CP1-4	450,713	750,615	299,902	0.66	CP10-4	320,777	584,877	264,100	0.82

^aThe area of pith.

^bThe area of xylem plus pith.

^cThe area of xylem (Ⅱ minus Ⅰ).

^dThe area ratio between xylem and pith.