• Journal of Korean Society on Water Environment
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• v.32 no.2
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• pp.135-141
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• 2016

This study investigated changes of hydrology, soil characteristics, riparian vegetation communities, and geomorphology in sandbars before and after sand-mining to determine the effect of sand-mining at upstream of Guemgang and Bochungcheon streams in Korea. Sand-mining events affected the mining area. They supplied organic matters and nutrients during flood. Sediment deposition caused soil texture change and expansion of vegetation area. However, riverbeds were stabilized after the disturbance. According to the analyses of aerial photographs, the vegetation area was significantly expanded in both dam-regulated streams and dam-unregulated streams after sand-mining. Willow shrubs advanced in disturbed area at an average of 10 years after sand-mining. It took willows trees 10.6 years to become dominant communities. Therefore, it took a total of 20.6 years for new riparian forest to form in sandbar after sand-mining. Our results confirmed that stream flow condition were dependent on vegetation recruitment in dam-regulated streams and dam-unregulated streams. For willow recruitment in unregulated streams, calculation of water level below dimensionless bed shear stress is important because low water level variation is a limiting factor of vegetation recruitment.

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• v.4 no.3
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• pp.95-103
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• 2023

This study aimed to identify the initial migratory macroinvertebrate species in two newly created mountain wetlands. To analyze the initial immigration species of macroinvertebrates, two experimental sites and two control sites were selected after habitat creation and investigated thrice from spring to fall. Benthic macroinvertebrates were collected quantitatively from each site using a Surber sampler and Modified D-frame deep net. After restoration at the two experimental sites, the number of macroinvertebrate species and individuals gradually increased from spring to fall and continued to increase over time with the development of waterside vegetation and habitat stabilization at the experimental sites. The species initially introduced to mountain wetlands after their creation were Ephemera strigata, Ephemera orientalis, Chironomidae sp., and Aquaris paludum. Subsequently, predators such as Davidius lunatus, Sieboldius albardae, Oyamia nigribasis, and Sialis longidens were introduced. Additionally, as a differentiating physicochemical factor between the two habitats, current velocity, which determines the distribution characteristics of benthic macroinvertebrates, and water temperature, which impacts the growth of organisms, showed a relatively stronger influence.

• Journal of Korean Society of Forest Science
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• v.94 no.4 s.161
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• pp.226-235
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• 2005

The burned pine forest may change into the grassland with bushes. However, it is likely that forest insects immigrated from the adjacent forest may be temporally abundant in the burned forest. This study was conducted to observe the immigration of insects for a year since forest fire. Beetle fauna in burned forest was compared with that in unburned forest in Goseong in Gwangwon province where the big fire was occurred and burned 3,762 ha of forest in 1996. The 381 individuals of 60 beetle species was collected from the burned forest, whereas the 370 individuals of 63 beetle species from the unburned forest. There was no difference in abundance and species richness of beetle fauna between burned forest and unburned forest. Most of abundant beetle species were collected from burned forest as well as unburned forest. Seasonal occurrence of the insects in burned forest were similar to those in unburned forest. These indicate active immigration of insects in burned forest in early season after fire. The beetles dwelling on vegetation were more actively immigrated into burned forest compared with those foraging in ground.