Content of nutrients (%TN, %P2O5), total organic matter (%TOM), elemental C:N ratios and isotopic signatures of carbon (13C) and nitrogen (15N) in TOM in surficial sediment layer (0-4 cm depth) of 6 sampling sites in Ha Long Bay (March, 2012). Standard deviations of %TN, %P2O5 and TOM was less than 15%, 20% and 10%, respectively, from the mean values.

Table 1: Content of nutrients (%TN, %P2O5), total organic matter (%TOM), elemental C:N ratios and isotopic signatures of carbon (13C) and nitrogen (15N) in TOM in surficial sediment layer (0-4 cm depth) of 6 sampling sites in Ha Long Bay (March, 2012). Standard deviations of %TN, %P2O5 and TOM was less than 15%, 20% and 10%, respectively, from the mean values.

Sampling site (Coordinate)	TN, %	P₂O₅, %	TOM, %	C:N ratio, % w (s)	d¹³C, ‰	d¹⁵N, ‰
HL1(20° 9406N, 106° 9270E)	0.13	0.07	4.52	30.4 (1.7, n = 3)	-26.53	5.32
HL2(20° 9355N, 106° 9355E)	0.13	0.08	2.38	15.7 (1.3, n = 3)	-25.71	4.55
HL3(20° 9322N, 106° 9570E)	0.08	0.04	1.04	12.4 (1.3, n = 3)	-25.08	5.56
HL4(20° 9273N, 106° 9650E)	0.11	0.05	1.40	12.5 (0.9, n = 3)	-24.62	4.95
HL5(21° 0023N, 107° 3696E)	0.04	0.02	0.44	27.2 (1.2, n = 3)	-25.88	4.68
HL6(21° 0059N, 107° 3704E)	0.08	0.03	0.53	6.8 (1.7, n = 3)	-24.78	5.46