TABLE 5.
Mean (±SE) values of biochemical traits from H. stipulacea shoots from the anthropogenically impacted sites (NB) and low impacted sites (SB) in control (n = 6) and fertilized (n = 6) plots.
| Biochemical traits | Site | July 2019 | December 2019 |
|
| Control | Fertilized | |||
| Leaf C | North Beach | 23.60 ± 0.58 | 20.35 ± 0.30† | 20.47 ± 0.41 |
| South Beach | 24.76 ± 0.41 | 21.18 ± 2.47† | 23.95 ± 2.07 | |
| Rhizome C | North Beach | 27.15 ± 0.28 | 24.81 ± 0.49 | 24.37 ± 0.94 |
| South Beach | 26.04 ± 0.72 | 26.36 ± 2.75✱ | 20.69 ± 0.40 | |
| Leaf N | North Beach | 1.03 ± 0.02 | 1.02 ± 0.03 | 1.19 ± 0.04 |
| South Beach | 1.04 ± 0.04 | 1.10 ± 0.22 | 1.27 ± 0.18 | |
| Rhizome N | North Beach | 0.53 ± 0.03 | 0.95 ± 0.12† | 1.31 ± 0.17 |
| South Beach | 0.36 ± 0.02✱ | 0.93 ± 0.50† | 0.64 ± 0.08 | |
| Leaf δ13C | North Beach | −6.80 ± 0.12 | −7.88 ± 0.30† | −8.07 ± 0.29 |
| South Beach | −6.85 ± 0.13✱ | −8.22 ± 0.99† | −9.57 ± 1.16 | |
| Rhizome δ13C | North Beach | −7.40 ± 0.13 | −7.73 ± 0.28† | −8.20 ± 0.35 |
| South Beach | −7.34 ± 0.16 | −8.51 ± 0.96† | −7.66 ± 0.13 | |
| Leaf δ15N | North Beach | 2.09 ± 0.26 | 1.16 ± 0.38† | −2.38 ± 0.40✢ |
| South Beach | 1.37 ± 0.18 | 0.33 ± 0.93† | −0.52 ± 1.77✢ | |
| Rhizome δ15N | North Beach | 1.28 ± 0.24 | 0.58 ± 0.38 | −4.15 ± 0.46✢ |
| South Beach | 0.75 ± 0.16✱ | 0.68 ± 1.15 | −4.62 ± 0.50✢ | |
| Leaf C:N ratio | North Beach | 22.99 ± 0.52 | 20.02 ± 0.70† | 17.25 ± 0.57 |
| South Beach | 24.17 ± 0.65 | 20.50 ± 1.62† | 19.50 ± 1.07 | |
| Rhizome C:N ratio | North Beach | 52.59 ± 2.88 | 28.69 ± 4.42† | 20.63 ± 3.30✢ |
| South Beach | 74.76 ± 3.57✱ | 49.54 ± 8.72✱† | 35.07 ± 4.30✱✢ | |
| Leaf P | North Beach | 1499.22 ± 133.35 | 1515.46 ± 162.22 | 1580.18 ± 236.69 |
| South Beach | 1171.68 ± 132.54 | 1310.87 ± 191.34 | 1244.18 ± 249.36 | |
| Rhizome P | North Beach | 1704.03 ± 50.10 | 1854.39 ± 208.95 | 1837.99 ± 198.91 |
| South Beach | 986.41 ± 69.35✱ | 793.81 ± 131.69✱ | 802.34 ± 197.99✱ | |
| Leaf starch | North Beach | 56.46 ± 3.74 | 44.31 ± 4.10 | 40.99 ± 2.99 |
| South Beach | 88.47 ± 6.20✱ | 82.75 ± 23.34✱ | 62.08 ± 3.32✱ | |
| Leaf sucrose | North Beach | 25.00 ± 1.78 | 22.80 ± 1.49 | 23.00 ± 1.76 |
| South Beach | 52.28 ± 5.29✱ | 37.67 ± 4.23✱ | 34.00 ± 3.69✱ | |
| Rhizome starch | North Beach | 74.46 ± 4.79 | 44.41 ± 4.71 | 49.11 ± 4.61 |
| South Beach | 80.31 ± 4.01 | 83.05 ± 14.71✱ | 68.71 ± 4.41✱ | |
| Rhizome sucrose | North Beach | 121.00 ± 8.31 | 88.15 ± 18.97 | 55.00 ± 14.20✢ |
| South Beach | 113.88 ± 8.01 | 109.77 ± 26.41 | 72.00 ± 17.58✢ | |
C and N contents are expressed as percentages, while δ13C and δ15N are in parts per thousands. P content is shown in μg g–1 and starch as well as sugar contents are expressed as sucrose equivalent mg per g dry weight. ✱ indicates significant differences between impacted (NB) and non-impacted (SB) sites.† indicates significant seasonal differences between July and December, and ✢ indicates significant differences between control and fertilized plots.