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Selecting proper tree species for revegetation is important for restoring tropical peatland. Tamanu (Calophyllum inophyllum L.) has been suggested one of the promising native species in Indonesia for the revegetation of tropical peatland; however, there is a lack of understanding of its growth in peat soil with different groundwater levels. We investigated the survival rate, plant height, number of leaves, root collar diameter, and dry biomass of tamanu seedlings grown in peat soil with different groundwater levels using a randomized block design in a water tank. The study involved five groundwater level treatments and 12 tree-level replicates each: M0 (non-groundwater level, control); M1 (−15 cm below the soil surface); M2 (−10 cm); M3 (−5 cm); and M4 (0 cm, soil surface level). The results showed that all tamanu seedlings survived in every treatment. However, their plant height, number of leaves, and root collar diameter growth were significantly inhibited in the highest groundwater level condition (M4, 0 cm) at 81 days after sowing, while their growth in −15 cm of groundwater level (M1) was as good as the growth in the fully drained conditions in M0 (control). This result indicates that the groundwater level should not be higher than −15 cm for the growth of tamanu. Considering that peatlands in Indonesia are assessed to be degraded when the groundwater level is lower than −40 cm, this study suggests that maintaining groundwater levels between −40 cm and −15 cm in peatland is the best condition for rapid growth of early tamanu seedlings while protecting peatlands. Further studies are needed to extend the range of water levels and water treatment duration. [ABSTRACT FROM AUTHOR]

The research was aimed to examine morphological, physiological and anatomical characters of Lansium domesticum Corr. (duku) accessions from three locations in Musi Rawas Regency, South Sumatra Indonesia. The experiment was carried out from February to April 2016. The physiology and anatomy analysis were carried out in the Laboratory of Plant Physiology, Department of Agronomy, Faculty of Agriculture, Sriwijaya University, South Sumatra. The methodology used was direct survey and observation strikethrough. Based on the results of research in Musi Rawas Regency to the morphology, anatomy and physiology characters of duku gained wide variability of phenotypic diversity on leaf color, leaf area, plant height, stem girth, number of abaxial stomata, and leaf chlorophyll, while the other variables (leaf length, leaf width, number of adaxial stomata, leaf sucrose, leaf total N, leaf shape, leaf venation, leaf edge, leaf base, leaf tip, branching type, and type of stomata) had a narrow variability. Based on genetic relationship gained two large groups with the value diversity between the accession of 50%. [ABSTRACT FROM AUTHOR]