Table 3 Effect of sediment type on flavonoids in the aboveground and belowground tissues of seagrass Thalassia hemprichii. 1:0, the in-situ sediment without combining with coarse beach sand was added in the tank; 1:1, the combination of half in-situ sediment and half coarse beach sand was added in the tank; 1:2, the combination of 1/3 in-situ sediment and 2/3 coarse beach sand was added in the tank

catechin

0.0223 ± 0.0065^a

0.55

0.0090 ± 0.0041^b

0.33

0.0115 ± 0.0033^b

0.43

14.4433 ± 5.4480^A

67.56

1.1228 ± 0.0646^B

31.20

0.2845 ± 0.0281^C

10.20

epicatechin

nd

nd

nd

1.2517 ± 0.1782^A

5.85

0.0437 ± 0.0016^B

1.22

nd^C

taxifolin

nd

0.0068

0.25

nd

0.0219 ± 0.0101^A

0.10

0.0146 ± 0.0096^A

0.41

0.0234 ± 0.0119^A

0.84

galuteolin

1.9969 ± 0.6946^a

49.97

1.5255 ± 0.9832^a

55.46

1.6700 ± 1.0298^a

62.55

0.0033 ± 0.0013^A

0.02

0.0069 ± 0.0037^A

0.19

0.0078 ± 0.0029^A

0.28

rutin

0.0049 ± 0.0041^a

0.12

0.0024 ± 0.0007^a

0.09

0.0026 ± 0.0009^a

0.1

0.0116 ± 0.0057^A

0.05

0.0025 ± 0.0001^B

0.07

0.0101 ± 0.0063^AB

0.36

isoquercitrin

0.4959 ± 0.2699^a

12.41

0.1903 ± 0.1332^a

6.94

0.2901 ± 0.1066^a

10.87

5.2404 ± 1.1379^A

24.51

1.4558 ± 0.4994^B

40.45

2.3086 ± 1.1878^B

82.76

astragalin

nd

nd

nd

0.0135 ± 0.0016^A

0.06

0.0102 ± 0.0011^B

0.28

0.0119 ± 0.0016^AB

0.43

diosmin

0.0027 ± 0.0006^a

0.07

0.0040 ± 0.0008^a

0.15

0.0034 ± 0.0007^a

0.13

Nd

nd

nd

quercetin

0.0439 ± 0.0166^a

1.10

0.0076 ± 0.0061^b

0.28

0.0165 ± 0.0047^b

0.62

0.3283 ± 0.0829^A

1.54

0.0544 ± 0.0068^B

1.51

0.0282 ± 0.0110^C

1.01

naringenin

0.0175 ± 0.0095^a

0.44

0.0087 ± 0.0021^a

0.32

0.0067 ± 0.0018^a

0.25

0.0073 ± 0.0015^A

0.03

0.0187 ± 0.0073^B

0.52

0.0076 ± 0.0035^A

0.27

luteolin

1.3468 ± 0.2366^a

33.70

0.9275 ± 0.4247^ab

33.83

0.6227 ± 0.2648^b

23.33

0.0581 ± 0.0246^A

0.27

0.8522 ± 0.6017^B

23.67

0.1065 ± 0.0668^A

3.82

apigenin

0.0628 ± 0.0223^a

1.57

0.0631 ± 0.0118^a

2.30

0.0443 ± 0.0137^a

1.66

0.0005 ± 0.000^A

0.01

0.0153 ± 0.0131^C

0.43

0.0008 ± 0.0001^B

0.03

chrysin

0.0013 ± 0.0003^a

0.03

0.0006 ± 0.0001^b

0.02

0.0008 ± 0.0001^b

0.03

Nd

0.0018 ± 0.0007

0.05

nd

kaempferide

0.0015 ± 0.0007^a

0.04

0.0009 ± 0.0001^a

0.03

0.0007 ± 0.0002^a

0.03

Nd

nd

nd

sum

3.9956 ± 1.1751^a

100

2.7421 ± 1.5258^a

100

2.6691 ± 1.4033^a

100

21.3797 ± 6.4628^A

100

3.5973 ± 1.1740^B

100

2.7894 ± 1.2502^B

100