• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1128-1130
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• 2003

This study investigated interannual variations in Northeastern Asian vegetation activity inferred from NOAA/AVHRR data during 1984 to 1993. Firstly, original NOAA/AVHRR data was radiometrically and atmospherically corrected in order to produce a consistent and calibrated time series NDVI by eliminating the effect of atmospheric effects and sensor degradation. Next, the NDVI data was analyzed to detect terrestrial ecosystem responses to climate change. A larger increase in growing season NDVI magnitude was observed in Northeastern Asia. Especially, vegetation activity is increasing in north part of Northeastern Asia. However, satellite drift and eruption effect have affect on interannual NDVI variations and it has affected the result in some degree. To improve accuracy of the result, it is necessary to correct these effects.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.1378-1378
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• 2005

• 한국작물학회:학술대회논문집
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• 한국작물학회 1991년도 추계 학술대회지
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• pp.40-41
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• 1991

• 한국환경생물학회:학술대회논문집
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• 한국환경생물학회 2005년도 추계학술대회 초록집
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• pp.88-88
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• 2005

• 생태와환경
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• 제46권3호
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• pp.429-439
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• 2013

한반도의 참나무 중 수분과 유기물이 많은 입지에 분포하는 상수리나무와 수분이나 양분이 적은 척박한 건조지에 분포하는 굴참나무를 대상으로 대기 중의 $CO_2$ 농도와 기온이 상승하고 환경요소인 광, 토양수분, 영양소가 변화할 때 두 종의 생태 지위폭과 생태 지위 중복역에 가장 많은 영향을 미치는 요소가 어떤 것인지 알아보고자 하였다. 유리온실 내에서 대기 중의 $CO_2$ 농도를 그대로 반영한 대조구와 이보다 $CO_2$ 농도는 약 1.6배와 온도는 $2.2^{\circ}C$ 상승시킨 온난화처리구에서 유식물에 주요 환경요인 중 광, 토양수분과 영양소를 각각 4구배로 처리하여 두 종의 생태 지위폭과 생태 지위 중복역을 계산하였다. 그 결과, 상수리나무의 생태 지위폭은 대조구와 온난화처리구간에 통계적인 차이는 없었고, 굴참나무의 생태지위폭은 대조구에 비해 온난화처리구의 영양소 처리구에서 감소하였다. 상수리나무와 굴참나무의 생태 지위 중 복역은 대조구에 비해 온난화처리구의 토양수분과 영양소 처리구에서 감소하였다. 이러한 결과는 유식물을 대상으로 실험한 결과로 성측목에 적용하는 것은 한계가 있으나, 지구온난화가 진행됨에 따라 상수리나무와 굴참나무는 토양수분과 영양소 환경에 의한 경쟁이 약해질 것으로 유추할 수 있다. Cluster 분석과 PCA 분석 결과, 두 종은 $CO_2$ 농도 및 온도 증가에 의한 반응보다 광 환경에 따라 민감하게 반응하는 것으로 나타났다.

• Journal of Ecology and Environment
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• 제30권1호
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• pp.69-73
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• 2007

The sources and the frequency of disturbances and the responses of shorebirds to disturbances were studied at four roosting sites on Ganghwa Island and Yeongjong Island. The mean frequency of disturbance to roosting shorebirds was 2.7 per hour. Human activities contributed to the disturbance in 65% of all cases. Disturbance frequencies in saltpans were higher than those in the upper tidal zone, fishponds and salt marshes. Response patterns of shorebirds to disturbances were associated with the source of the disturbance. Disturbance caused shorebirds to change their behavior and to reduce roosting time at their roosting sites. Four patterns of responses by roosting shorebirds to disturbance were found, including: (1) leaving the roosts, (2) changing their location within the site, (3) leaving and returning, and (4) remaining in place. In the latter three response patterns, the birds tended to remain in their initial roosting sites, in contrast with the leaving pattern, which involved departing from the roosting area. Factors affecting these response patterns were time from high tide and time of day. When the time from high tide was greater, and the time of day was later, more birds stayed at the roost. The absence of sufficient alternative roosts in the study areas forced the birds to choose between tolerating the current disturbance, or moving to distant roosts.

• KIEAE Journal
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• 제7권4호
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• pp.63-74
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• 2007

While the importance of social integration has been mainly emphasized in the fields of social welfare services for the elderly, disabled and lower income citizens, many types of elderly housing had been developed in a way of segregating the elderly from society rather than integrating. Meanwhile, shared group house may allow older people to 'age in place' within the communities where they used to live by providing them with social, economic and practical benefits. The purpose of this study is to carry out empirical research on responses to elderly shared group house. Interview survey with questionnaire was conducted among 138 elderly people between 60-75 years old, living in Seoul and its metropolitan area. Responses of the elderly included awareness, perception and preference. It was revealed that the respondents had negative perceptions on existing shared group house in Korea. Most of the respondents showed preference to moving into socially-integrated type of shared group houses developed within their communities. This study indicated the potential of such type shared group house to become a favorable housing alternative for elderly people which supports their sustainable independent living within community.

• Journal of Ecology and Environment
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• 제31권4호
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• pp.261-267
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• 2008

Growth and photosynthetic responses of one $C_3$ and two $C_4$ plants in the family Chenopodiaceae in three $CO_2$ concentration $([CO_2])$ conditions-low (about $243{\mu}mol\;mol^{-1}$, LC), present (about 378, PC), and high (about 465, HC)-were investigated in open top chambers. The relative growth rate (RGR) and net assimilation rate in the $C_3$ plant, Chenopodium album, increased with increasing $[CO_2]$, though the RGR was not enhanced significantly in the HC condition. The leaf area ratio and leaf weight ratio of the $C_3$ plant drastically decreased with increasing $[CO_2]$, suggesting that the $C_3$ plant invests more biomass to leaves in lower $[CO_2]$ conditions. The two $C_4$ plants, Atriplex glauca and A. lentiformis, showed relatively small changes in those growth parameters. These photosynthetic-pathway-dependent responses suggest that growth patterns of $C_3$ and $C_4$ plants have been altered by past increases in atmospheric $[CO_2]$ but that there will be relatively little further alteration in the future high-$CO_2$ world.

• Journal of Ecology and Environment
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• 제35권4호
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• pp.279-289
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• 2012

This study conducted a comparative analysis of benthic macroinvertebrate communities in the Fosu and Benya lagoons in Ghana, based on the anthropogenic effect on the two lagoons. Salinity, oxygen, temperature, conductivity, turbidity and pH were measured, invertebrate richness and species densities were determined. The AZTI Marine Biotic Index (AMBI) and multivariate statistics were used to determine the different responses of fauna to pollution. The fauna were categorized into five ecological groups based on the degree of tolerance of the different species to pollution: disturbance-sensitive species; disturbance-indifferent species, disturbance-tolerant species, second-order opportunistic species; and first-order opportunistic species. The Fosu Lagoon supported more pollution tolerant species, whereas the Benya Lagoon had more species that were sensitive to organic enrichment under relatively unpolluted conditions. Chironomus sp., which is adapted to virtually anoxic conditions, was the most abundant in the Fosu Lagoon whereas Nemertea sp. was the most abundant in the Benya Lagoon. The numerical and relative abundance (%) of all 7 taxa in the Fosu Lagoon was 1,359 and 92.35%, respectively. The numerical and relative abundance (%) of all 34 taxa in the Benya Lagoon was 2,459 and 87.52%, respectively. Expectedly, the level of dissolved oxygen in the less saline Fosu Lagoon was higher than that in the more saline Benya Lagoon. The reduced photoperiod and photosynthetic activities of aquatic plants might account for this trend. There is a need to implement comprehensive monitoring and management initiatives for sustaining the ecological health of coastal lagoons in Ghana in order to support the many people that depend upon these ecosystems for their livelihood.

• Journal of Ecology and Environment
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• 제30권1호
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• pp.101-105
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• 2007

Lammas growth, a rare phenomenon for Korean red pine (Pinus densiflora), occurred in 2006. Lammas shoots showed higher frequency and longer length in Seoul's hotter urban center than in urban boundary or suburban forest sites. Frequency and length showed a close correlation with urbanization density and vegetation cover expressed in NDVI. Air temperature in the late summer of 2006 was more than $1^{\circ}C$ higher than an average year. Of the predominant environmental signals that modulate bud flush, only temperature changed significantly during the year. Differences in temperature between the urban centers, urban boundaries and suburban forests correlated with varying land-use density. The rise in temperature likely spurred lammas growth of the Korean red pine. Symptoms of climate change are being detected throughout the world, and its consequences will be clearer in the future. Considerate interest in the responses of ecological systems to the variable changes is required to prepare for unforeseeable crises. Monitoring of diverse ecological phenomena at Long Term Ecological Research sites could offer harbingers of change.