Komara LL, Choesin DN, Syamsudin TS. 2016. Plant diversity after sixteen years post coal mining in East Kalimantan,. Post coal mining areas need to be rehabilitated through reclamation and revegetation. The objective of this study was to evaluate plant diversity after 16 years of revegetation activities in a coal mining reclamation site in East Kalimantan. In an effort to restore plant diversity, the coal mining company began by planting fast growing species as pioneers, then planting local species after three years. This study compared a 20 hectare reclamation site with conditions in the pre-mining area, which covered 14,988 hectares. Vegetation sampling was conducted in 20 plots measuring 20x20 m 2 along line transects, with 100 m distance between plots. A total of 104 plant species were found in the reclamation site, consisting of 76 tree species and 28 herbaceous species. Tree species consisted of 35 planted local species (e.g., Dryobalanops aromatica, Eusideroxylon zwageri, Macaranga gigantea), 25 planted non-local species, and 16 local species that grew spontaneously (e.g., Leucaena glauca, Lansium domesticum, Shorea laevis). In comparison, 133 species were found in the pre-mining site, consisting of 132 local tree species, one non-local tree species (Acacia mangium) and 52 herbaceous species. Tree species diversity index in the reclamation site after 16 years post mining (i.e., 3.54) was still lower than in the pre-mining area (4.29); while the diversity indices for herbaceous plants were relatively similar (2.97 and 2.67 in the reclamation and pre-mining sites respectively). The slightly higher diversity of herbaceous plants in the reclamation site may be attributed to higher coverage per species in this site, despite lower species richness.

Abstract. Purba JH, Sasmita N, Komara LL, Nesimnasi N. 2019. Comparison of seed dormancy breaking of Eusideroxylon zwageri from Bali and Kalimantan soaked with sodium nitrophenolate growth regulator. Nusantara Bioscience 11: 146-152. Eusideroxylon zwageri is a very strong and durable wood, which can be used as building materials. This wood plant needs 6-12 months to germinate, but it can be shorted with special treatment (e.g. cracking). Therefore, it is important to conduct research to stimulate E. zwageri seed germination using sodium nitrophenolate growth regulator. The purpose of this study was to analyze the comparison of the fastest time to breaking E. zwageri seed dormancy from the Bali and Kalimantan island. The research method was factorial randomized block design, using the X factor (soaking time) and Y factor (sodium nitrophenolate growth regulator). There were four soaking time treatment, i.e., immersed (soaked in a really short time), 12 and 24 hours soaking time. While the Y factor was the concentration of sodium nitrophenolate with 4 treatments: without sodium nitrophenolate solution or 0 mL (control), soaked in a 1 mL/L of water, 2 mL/L of water and 3 mL/L of water solution. The study results showed the best treatment of E. zwageri seeds germination speed was soaked for 24 hours, and by giving 0,3% sodium nitrophenolate concentration, while the interactions of both showed no significant effect. The soaked time treatment, sodium nitrophenolate concentration, and the interaction of both show no significant effect on germination percentage. The breaking of E. zwageri seed dormancy from Kalimantan has a shorter time to germinate than E. zwageri seeds from Bali.

Telajakan and mixed gardens are land management systems in Bali. The existing plants are a combination of tree plants, shrubs, palms, bamboo and others by combining agricultural crops and or livestock. This practice is found in one land management unit to the landscape of rural agroecosystems. In the agroforestry system, this system is more of a family-based activity (household-based agroforestry). This study discusses and examines the value of plant species, as well as the benefits for the household level in Tabanan Bali. The study was conducted from January to June 2019 in Pinge Village, Tabanan Regency, Bali, which is a village that provides green space and the beauty of environmental aesthetics. Observation of various species of plants was carried out using Quick Biodiversity Survey (QBS) method, the complementary of the Rapid Agro Biodiversity Appraisal (RABA) method. The observations were carried out on 40 plots representing agroforestry land-use systems. The results showed that the biodiversity and species richness level belonged to the medium category. There are 55 plant species from a combination of agricultural and forest plants. The vegetation structure of Telajakan and mixed gardens guarantees a natural regeneration process. Telajakan and mixed gardens cause the development of commercial species with high economic value and fast-growing species. The plants used by the community for aesthetics, religious ceremonies, food, medicines, building materials, and household utensils. Most of the purposes of use are for green open spaces and environmental aesthetics, subsistence consumption. The results of other plants that are useful for commercial purposes are special crops that are cultivated intensively. The community believes that by observing the environment and the aesthetics of nature is the realization of worship in the relationship between humans, nature and God (Tri Hita Karana).

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Environment quality decrease is one of the impact of coal mining activities in East Kalimantan. The land becomes barren and critical, making it difficult for plants to grow and adapt, therefore post-mining area needs to be rehabilitated to restore the soil of the land as an important factor in crop cultivation. Before being planted with local trees, the environmental conditions must be suitable for seedlings to be planted. One of the pioneer plants functions is to stabilize the post-mining environmental conditions. The objective of this study was to determine a pioneer species that have a well adapt to the post-coal mining environment in East Kalimantan. This study using completely randomized block design. The plot used a rectangular 30×25 meter plot of 15 plots for five pioneer tree species. Data collected were the plant life percentage, plant height, stem diameter and crown diameter. The study result showed that from the five species of pioneer plants there were three species has an optimal growth they are Alstonia scholaris, Homalanthus populneus and Croton argyratus. Based on the List Significance Difference test 5% level results shows the Alstonia scholaris and Croton argyratus life percentage is not significantly different with Homalanthus populneus, but it is very different from Macaranga gigantea and Trema tomentosa. Homalanthus populneus is the most adaptable pioneer species in the open area, its growing in the open post-mining area and from the forest with has intact condition. The genetic factors really affect the adaptation and growth of pioneer plants in post-mining areas.