| dc.description.abstract | Assessment of nematode and microbial diversity and screening of entomopathogens
in revegetated post-coal-mining land in Kutai Kartanegara District, East Kalimantan, Indonesia. Biodiversitas 25: 2921-2930. Post
coal-mining management should strive toward site revegetation. The success of such revegetation efforts is largely determined by the
soil's fertility status, which encompasses physical, chemical, and biological components. Biological fertility is indicated by the presence
and abundance of soil microbes and nematodes. The objective of this study was to identify the diversity of nematodes and soil microbes
in ex-coal-mining land revegetated with oil palm in Kutai Kartanegara District (East Kalimantan, Indonesia), to screen for
entomopathogenic nematodes and microbes, and to analyze their relationships with the chemical fertility status of the land. As a control,
non-mining land was also investigated. The results showed that microbial diversity and density (including fungi and bacteria) in the ex
coal-mining area were significantly lower compared to the control. Additionally, a decrease in microbial diversity and density was found
in deeper soil layers of both post-mining and non-mining lands. In contrast, soil nematodes were more abundant in post-mining land,
both in terms of diversity and density, and were also more plentiful in the deeper soil layers. Among the nematodes and microbes
studied, only Heterorhabditis and Steinernema (nematodes), Trichoderma (fungi), and Bacillaceae (bacteria) were identified as
entomopathogens, causing death in Tenebrio molitor L. larvae. Overall, soil fertility in ex-coal-mining land was observed to be lower,
characterized by decreased soil pH, basic saturation, Soil Organic Carbon (SOC), and nutrient content, which contributed to a reduced
microbial community compared to non-mining land.
Keywords: Entomopathogen, Kutai Kartanegara, nematodes, post-coal mining, soil microbes, Trichoderma | en_US |
