PAGIASI RIAP DIAMETER TUMBUHAN BERKAYU DI AREA REVEGETASI PERUSAHAAN TAMBANG BATUBARA DI PROVINSI KALIMANTAN SELATAN, INDONESIA

Abstract

The presence and growth of vegetation in ex-mining revegetation areas must be evaluated periodically to achieve the real revegetation objectives. The aim of this study was to analyze the diameter increment of woody plants, especially those that are intentionally planted in revegetation areas. The four sample locations were in the PT Adaro Indonesia’s revegetation areas of 2014, 2015, 2016 and 2017. In each location 10 (20 m x 20 m) plots were continuously laid out and in each plot there were 4 (10 m x 10 m) plots. The (20 m x 20 m) plots were used to record woody plant species and measure the circumference of the stem (at breast height) which was ≥62.8 cm. One of the 4 (10 m x 10 m) plots was used to record woody plants and measure the circumference of the stem which was 31.4 ‒ <62.8 cm. Data were tabulated and analyzed to obtain mean annual increment and current annual increment. From the two measurement periods (2018 and 2019), four woody plant species were found and met the requirements for calculating diameter increments. Balik angin (Mallotus paniculatus) has not been used for drawing conclusions because there is only 1 individual in all locations. The diameter increments of mangium (Acacia mangium) and turi (Sesbania grandiflora) tended to decrease to an undetermined age, while sengon (Paraserinthes falcataria) increased. The trend direction for current annual increment is not yet known because it is a single value. The values for mangium and turi are smaller than the diameter increments, while for sengon are higher.