Table 2: Concentrations (mean ± SD, µg/g dw) of Zn in leaves, stems and roots of Centella asiatica and four geochemical fractions in the habitat tosoils.

leaves Stems Roots F1 F2 F3 R SUM NR
PPauh 316 127 336 8.45 39.3 63.8 112 224 60.6
Karangan 172 133 208 2.00 3.14 12.9 31.9 49.9 15.9
Kluang 145 124 185 2.43 4.92 10.8 24.4 42.6 76.6
Butterworth 337 160 349 14.7 52.4 69.3 171 308 103
UPM 145 124 208 0.44 5.13 36.3 46.6 88.5 11.4
Kapar 121 91.3 134 1.64 4.36 5.87 21.3 33.1 37.6
Seremban 182 177 230 3.17 67.1 31.6 108 210 102
KSR 160 127 171 1.93 22.3 31.5 77.1 133 77.3
Pontian 182 172 214 2.15 25.4 53.1 131 212 27.5

Note: Zn data in the leaves, stems and roots of Centella asiatica and their habitat topsoils were cited from Ong et al. [8]. F1= easily, freely or exchangeable fraction (EFLE); F2= acid-reducible (AR); F3= oxidisable-organic (OO); F4= resistant (R) fractions; SUM= summation of F1, F2, F3 and F4; NR= nonresistant fractions (F1 + F2 + F3).