The objective of this study was to characterize soil physical and chemical properties, development of soil and microclimate condition according to the time sequence of revegetation. Sampling and observation were conducted in revegetation areas aged 2 to 8 years old and in the natural forest for comparison. Disturbed soil samples were taken from three depths while undisturbed soil samples were taken from two depths. Light intensity, air temperature, humidity and soil temperature were measured for microclimate analysis. The results showed that the soil had clay loam and loam texture with relatively high density and low permeability. Natural forest soil had lower density and higher permeability. Low soil fertility was indicated by low organic-C, total-N, available P and exchangeable K. Exchangeable-Ca and -Mg and cation exchange capacity of the soil in revegetation area were higher than in the natural forest soil. Only the content of organic-C and total-N in the first 5 cm layer of the soil increased along with the increasing revegetation age, while other parameters of soil properties showed no differences. Falcataria moluccana, Anthocephalus cadamba and Melochia umbelata were the dominant vegetation found in sapling, pole and tree. Light intensity, air temperature and soil temperature tended to decrease, while humidity increased with the increasing age of revegetation.
Coal mining activities in Indonesia have a negative impact on the environment. Some vegetations are disturbed even be lost especially in mining with open mine operation. Revegetation is one of activities that can improve the quality of post mining land, which are also included in post mining land reclamation activities. The purpose of this study is to analyze the biodiversity of flora in post-coal mining revegetation area and to compare the condition of vegetation in various revegetation age classes with the condition of vegetation in natural forest. Vegetation data were collected using the plotted line method in natural forest and plot method with the systematic sampling method with random start (revegetation area). The analysis found that overall conditions of revegetation area have more diverse number of species, namely 52 species woody plant species, and 23 herbaceous plant species, compared to the natural forest, which only has 46 woody plant species and 2 herbaceous plant species. Generally, diversity index and species increment in vegetation area at age more than 4 years is higher and approaching the state of natural forest than revegetation area age 0 - 2 years.
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