• Journal of the Korean Society of Environmental Restoration Technology
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• v.21 no.2
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• pp.77-85
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• 2018

The intensive habitats loss of natural organisms as a consequence of anthropogenic activities has lead to the use of alternative habitats for species conservation. We reviewed the current status of alternative habitats and suggest the improvement of alternative habitats. Most of alternative habitats regarded in this study are not following the pre-arranged consultation at environmental impact assessment. These alternative habitats are rendered useless due to the insufficient consideration of ecological characteristics of species and lack of detailed plans. A number of alternative habitats are influenced by disturbance such as environmental pollution and construction. Post-monitoring of alternative habitats are needed to estimate immigration rate of species. Post management is also needed to assess the status of population stability. Overall, low effectiveness of alternative habitats is presented in this study. According to the status survey, methods for improvement of alternative habitats are required such as detailed guidelines, establishment of post-monitoring system, improvement of habitat restoration techniques, and guidelines for management and operation of alternative habitats.

• 한국생태학회:학술대회논문집
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• 1998.05a
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• pp.96-96
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• 1998

• Journal of Ecology and Environment
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• v.33 no.3
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• pp.205-216
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• 2010

This research identified a disturbance regime caused by wild boar in a mature Quercus mongolica forest and analyzed the impact of this disturbance on the structure and distribution of herbaceous plants in Mt. Jeombong, Korea. We demonstrate that disturbance by wild boar was most frequent from winter to early spring, but also occurred year round. Areas which were frequently disturbed by wild boar included the mountain ridge, the mild slope on the north face, and sites with high concentration of Erythronium japonicum. The disturbance cycle by the wild boar in this region was estimated at approximately 2.8 years. The wild boar's reduced the community's species diversity and herbaceous coverage, and increased its evenness. This disturbance reduced the coverage of spring ephemeral; Veratrum nigrum var. ussuriense, Symplocarpus niponnicus, Anemone koraiensis and Corydalis turtschaninovii were particularly sensitive. In addition, summer green herbaceous plants such as Astilbe chinensis, Ainsliaea acerifolia, Meehania urticifolia, and Pimpinella brachycarpa were sensitive to the wild boar's. It was found that wild boar ate E. japonicum most selectively of all plants in this investigation area. In conclusion, together with micro-topography, wind, formation of gaps of a forest and rearrangement of litter layer, wild boar's disturbance is an important factor influencing the dynamic changes of an herbaceous community in a mature temperate hardwood forest.

• Journal of Korean Society of Forest Science
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• v.108 no.3
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• pp.296-301
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• 2019

This study was conducted to measure litterfall and nutrient (P, K, Ca, Mg) inputs under varying degrees of disturbance by pine wilt disease in pine forests in southern Korea. Litterfall was collected to evaluate nutrient responses at different intensities of disturbance (various levels of basal area) by pine wilt disease across 2 years. Phosphorus, Ca, and Mg concentrations in needle litterfall were positively correlated (p < 0.05) with decreased disturbance intensities (increased basal area) depending on the time of sampling, whereas the nutrient concentrations in other litterfall components (branches, bark, reproductive organs, and miscellaneous litterfall) were not significantly correlated (p > 0.05) with the intensity of pine wilt disease disturbance. Dry weight and nutrient inputs through litterfall components decreased linearly with increasing intensity of disturbance by pine wilt disease (p < 0.05), except for the nutrient inputs of branch (K, Ca, Mg) and reproductive organ (K, Ca) litterfall. These results indicate that decreased litterfall across different levels of disturbance may be related to the reduced soil nutrients in pine wilt disease forests.

• The Korean Journal of Ecology
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• v.18 no.1
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• pp.179-188
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• 1995

Death patterns of gap-makers and changes of environmental factors in gaps formed by disturbance were studied in Pinus densiflora forests of Youngwol, Mt, Mansu, Mt. Songni, Uljin, and Mt, Obong in Korea. Death pattern of gap-makers showed that standing deat type was the most frequent in all the study areas. Longevity of Pinus densiflora was about 140 years, which was about half of that of the temperate deciduous broad-leaved trees. size of gaps were distributed from $20m^2$ to $235m^2$, more than 80% of those were gaps created by death of two or more trees. Relative light intensity and water content of soil in gap area were higher than those in non-gap area and those in the central part of gap were the highest.

• Journal of Korean Society of Forest Science
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• v.101 no.3
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• pp.488-500
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• 2012

The present study was carried out to evaluate arthropod predators (Araneae, Carabidae, Staphylinidae, and Formicidae) as bioindicator for forest disturbance. We selected 12 study sites according to disturbance intensities caused by fire intensity and recovery methods at Goseong, Gangneung, and Samcheok in Gangwondo. Intensities of disturbance were characterized as follows: 0 (no fire), 1 (surface fire), 2 (crown fire), and 3 (crown fire followed by reforestation). Arthropod predators were captured using pitfall trap. Species richness and abundance of Araneae, Carabidae, Staphylinidae, and Formicidae were not different along disturbance intensities. However, species richness and abundance of grassland ants significantly increased in higher disturbance intensities. Abundance of grassland ants such as Formica japonica and Camponotus japonicas linearly decreased along litter depth. Furthermore, ant communities were clustered along disturbance intensities. In a one-time survey, ants may be most useful as bioindicator for forest disturbance among the four predator taxa, because ants actively forage for long seasons.

• Korean journal of applied entomology
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• v.50 no.4
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• pp.267-278
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• 2011

This study was conducted to estimate the effects of fire intensity and recovery methods on coleopteran communities in three burned forests, Goseong, Gangneung, and Samcheok in Gangwon province, Korea. Four sampling sites were selected in each study area according to disturbance degree (DD) caused by fire intensity and recovery methods. DD in the study sites were categorized as 0 (no fire), 1 (weak fire), 2 (strong fire), and 3 (strong fire followed by human disturbance). Beetles collected by pitfall traps were classified into 3 functional guilds: detritivore, herbivore, and carnivore. Diversity and abundance were slightly higher in the burned sites (DD = 1-3) than in the unburned sites (DD = 0), although there was no statistical significance. Coleopteran communities differed according to fire intensity and recovery method. This suggests that recovery of burned forests using both natural recovery and reforestation may increase the diversity of coleopteran communities.

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• v.2 no.1
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• pp.53-61
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• 2021

Distribution of fish community depends largely on environmental disturbance such as habitat change. In this study, we evaluated the impact of environmental variables and microhabitat patch types on fish distribution in Yudeung Stream at 15 sites between early May and late June 2019. We used non-metric multidimensional scaling to examine the distribution patterns of fish in each site. Gnathopogon strigatus, Squalidus gracilis majimae, Zacco koreanus, and Zacco platypus were associated with riffle and boulder areas, whereas Iksookimia koreensis, Acheilognathus koreensis, Coreoleuciscus splendidus, Sarcocheilichthys nigripinnis morii, and Odontobutis interrupta were associated with large shallow areas. In contrast, Cyprinus carpio, Carassius auratus, Lepomis macrochirus, and Micropterus salmoides were found at downstream sites associated with large pool areas, sandy/clay-bottomed areas, and vegetated areas. On the basis of these results, we suggest that microhabitat patch types are important in determining the diversity and abundance of fish communities, since a mosaic of different microhabitats supports diverse fish species. As such, microhabitat patches are key components of freshwater stream ecosystem heterogeneity, and a suitable patch composition in stream construction or restoration schemes will support ecologically healthy food webs.

• The Korean Journal of Ecology
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• v.15 no.4
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• pp.395-410
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• 1992

Disturbance regime and tree regeneration were studied in kwangnung natural forest, an old-growth deciduous hardwood forest located in central korea. This forest is dominated by carpinus laxiflora, c.erosa, and quercus species. The area occupied by canopy gaps was 4.6% of the total forested area, and the mean size of canopy gaps was 92 $m^2$ with the maximum being 524 $m^2$. More than half of the gaps were less than four years old, and 3/4 of the gaps were created by death of only or two canopy trees, indicating the dominance of small-sized gaps in kwangnung forest. about half of the gap-makers were c. laxiflora, and another one third were quercus species. In contrast, the most frequent relacers were c. laxiflora while quercus species filled only 5% of the gaps, suggesting a future shift in tree species composition under the current disturbance regime. tree regeration was more conspicuous even in small gaps than non-gaps regardless of shade-tolerance of tree species, indicating the importance of gaps in tree regeneration.

• The Korean Journal of Ecology
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• v.26 no.1
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• pp.19-22
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• 2003

In order to determine the degree of anthropogenic disturbance potentiality (ADP) of the area a rapid ecoassessment technique was developed on the basis of actual vegetation map. ADP degree of relevant unit cell was computed by using four criteria of land use patterns such as forested area, open water and stream, agricultural area, and urbanized area. Ultimate ADP degree of each cell was obtained by means of direct and indirect computation process. Finally the map of ADP was drawn and analyzed. Vulnerable cell and disturbance nuclei were determined according to disturbance vector which is a kind of potential disturbance pressure of relevant cell influenced by surrounding cell. A case study was accomplished in the Gijang area of Pusan metropolitan city. 973 meshes (500m×500m) were analyzed and a total of 79 meshes were currently threatened. Present technique of rapid ecoassessment was practically useful for diagnosing and planning land use.