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Table 1 Vegetation and water characteristics of the floating mat

From: Vegetation and water characteristics of floating mat in a coastal lagoon as the habitat for endangered plant species

Environmental components PA (n = 54) ZL (n = 7) Total (n = 61)
I. laevigata under PA (n = 13) M. trifoliata under PA (n = 6) PA (n = 54)
Major components (mean ± SD) PA Shoot height (cm) 160.9 ± 10.2 156.6 ± 12.6 158.5 ± 11.0 164.2 ± 15.4 159.2 ± 11.5
Shoot density (no./m2) 23.2 ± 7.7 22.7 ± 6.3 23.0 ± 8.0b 12.2 ± 4.7a 21.9 ± 8.3
Coverage (%) 66.0 ± 15.1 69.5 ± 13.1 66.8 ± 17.7 37.5 ± 10.1 63.8 ± 19.1
AGDW (g/m2) 288.7 ± 116.9 263.8 ± 81.5 286.5 ± 123.3 141.6 ± 39.8 271.5 ± 124.3
ZL Shoot height (cm) 115.2 ± 15.7 121. ± 12.1 116.2 ± 13.8 103.4 ± 11.0 115.2 ± 14.1
Shoot density (no./m2) 20.9 ± 9.3 24.8 ± 9.6 20.1 ± 8.9 46.5 ± 9.8 23.0 ± 12.1
Coverage (%) 23.9 ± 12.2 26.8 ± 12.9 21.6 ± 10.6 51.5 ± 6.4 25.0 ± 14.6
AGDW (g/m2) 68.7 ± 34.9 101.5 ± 52.7 69.7 ± 29.1 100.8 ± 22.6 74.6 ± 32.8
Minor components (frequency, %) P. thunbergii 61.5 100 79.6 33.3 75.4
C. heterolepis 61.5 75.0 64.8 0 57.4
P. muricata 15.4 0 20.0 33.3 24.6
B. frondosa 0 16.7 12.9 16.7 13.1
S. fluviatilis 0 0 0.04 66.7 0.08
S. tabernaemontani 0.08 0 0.04 0 0.05
J. effusus 15.4 0 0.04 0 0.03
I. globosa 0.08 0 0.02 0 0.03
H. erectum 0 0 0 16.7 0.02
Water environments (mean ± SD) Water level (cm) 6.1 ± 3.4 5.2 ± 2.5 4.3 ± 3.6 11.8 ± 7.2 5.1 ± 4.6
pH 6.6 ± 0.2 6.7 ± 0.1 6.7 ± 0.2 6.4 ± 0.3 6.6 ± 0.2
EC (μS/cm) 160.4 ± 59.3 218.8 ± 49.0 167.2 ± 55.4 141.2 ± 59.3 165.0 ± 55.4
NO3–N (ppm) 0.10 ± 0.04 0.09 ± 0.02 0.09 ± 0.03 0.12 ± 0.05 0.10 ± 0.03
NH4–N (ppm) 1.01 ± 0.91 1.37 ± 0.88 0.90 ± 0.77 0.62 ± 0.48 0.87 ± 0.74
PO4–P (ppm) 0.26 ± 0.39 0.12 ± 0.04 0.18 ± 0.23 0.28 ± 0.25 0.19 ± 0.23
K+ (ppm) 9.95 ± 7.38 15.5 ± 8.7 11.2 ± 8.4 8.26 ± 4.43 10.9 ± 8.0
Ca2+ (ppm) 4.71 ± 4.26 5.32 ± 1.84 5.16 ± 3.98 2.22 ± 1.53 4.9 ± 3.9
Na+ (ppm) 14.2 ± 1.7 13.2 ± 0.9 13.6 ± 1.5 14.5 ± 4.6 13.7 ± 2.0
Mg2+ (ppm) 5.25 ± 3.78 9.72 ± 1.86 5.77 ± 3.16 3.31 ± 2.44 5.6 ± 3.2
  1. PA Phragmites australis, ZL Zizania latifolia, AGDW above-ground dry weight, EC electric conductivity