• The Korean Journal of Ecology
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• 제23권2호
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• pp.117-123
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• 2000

Changing patterns and the possibility of climate change in the area of Cheiudo island, the southernmost Island in Korea, were analyzed using daily temperature and Precipitation data observed at the Cheiu Regional Meteorological Office from May 1923 to December 1998. A hydrologic simulation model "BROOK" was used to simulate and analyze the dynamics of daily soil moisture content and soil moisture deficit by applying the daily weather data. During the period, significantly increasing pattern was observed in temperature data of both annual and monthly basis, while no significantly changing pattern was observed in precipitation data. During the last 76 years. mean annual temperature was observed to have risen about 1.4$^{\circ}C$, which may show the Possibility of the initiation of climate change on the island whose validity should be tested in future studies after long-term studies on temperature. Based on the simulation, due to increased temperature, significant increase was predicted in evapotranspiration. while no significant decrease was detected in simulated soil moisture content during the period. Changing pattern of annual soil moisture content was markedly different from those of precipitation. In some dominant trees, negative effects of the drought of the late season for the previous year were shown to be statistically significant to radial growth of the tree for the current year. As annual variation of radial growth of trees is mainly affected by the soil moisture content. the information on the dynamics of soil moisture deficit possibly provides us with useful information for the interpretation of tree growth decline on the mountain. mountain.

• Journal of Forest and Environmental Science
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• 제37권4호
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• pp.280-291
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• 2021

The study examined the influence of climate and soil dynamics on vegetation health across the ecological zones in Rivers State, Nigeria. MODIS imagery was used to assess the vegetation health through NDVI and point grid pattern of meteorological data for total precipitation (TP), air temperature (AT), soil moisture (SM) and soil temperature (ST) of 2000, 2003, 2006, 2009, 2012 and 2015 were used for the study. Descriptive and inferential statistics were used for data analysis. Findings showed that NDVI ranged between 0.420 and 0.612 in the freshwater swamp (FWS) while between 0.465 and 0.611 in the rainforest and the NDVI in the mangrove was generally low. The highest mean AT was experienced in the mangrove ecological zone and the least was experienced in the rainforest. The mean SM was generally highest in the rainforest with highest value in 2000 (774.44 m³/m³). The ST was highest in the mangrove and the least was experienced in the rainforest while the TP was highest in the mangrove. NDVI correlated significantly with SM (r=0.720; p<0.05) and ST (r= -0.493; p<0.05). NDVI, SM, TP and ST significantly varied among the ecological zones. Regression analysis showed that vegetation health was significantly related to the combination of soil temperature and soil moisture (R²=0.641; p=0.000). Thus, monitoring the factors that affect vegetation health in a changing climate and soil environments is highly required.

• Journal of Ecology and Environment
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• 제47권4호
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• pp.264-271
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• 2023

Environmental crises caused by climate change and human-induced disturbances have become urgent challenges to the sustainability of human beings. These issues can be addressed based on a data-driven understanding and forecasting of ecosystem responses to environmental changes. In this study, we introduce a long-term ecological monitoring system in Korean Long-Term Ecological Research (KLTER), and a plan for the Korean Ecological Observatory Network (KEON). KLTER has been conducted since 2004 and has yielded valuable scientific results. However, the KLTER approach has limitations in data integration and coordinated observations. To overcome these limitations, we developed a KEON plan focused on multidisciplinary monitoring of the physiochemical, meteorological, and biological components of ecosystems to deepen process-based understanding of ecosystem functions and detect changes. KEON aims to answer nationwide and long-term ecological questions by using a standardized monitoring approach. We are preparing three types of observatories: two supersites depending on the climate-vegetation zones, three local sites depending on the ecosystem types, and two mobile deployment platforms to act on urgent ecological issues. The main observation topics were species diversity, population dynamics, biogeochemistry (carbon, methane, and water cycles), phenology, and remote sensing. We believe that KEON can address environmental challenges and play an important role in ecological observations through partnerships with international observatories.

• 한국물환경학회지
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• 제32권1호
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• pp.60-69
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• 2016

In this study, we estimated root zone soil moisture dynamics using remotely sensed (RS) data. A soil moisture data assimilation scheme was used to derive the soil and root parameters from MODerate resolution Imaging Spectroradiometer (MODIS) data. Based on the estimated soil/root parameters and weather forcings, soil moisture dynamics were simulated at spatio-temporal scales based on a hydrological model. For calibration/validation, the Little Washita (LW13) in Oklahoma and Chungmi-cheon/Seolma-cheon sites were selected. The derived water retention curves matched the observations at LW 13. Also, the simulated soil moisture dynamics at these sites was in agreement with the Time Domain Reflectrometry (TDR)-based measurements. To test the applicability of this approach at ungauged regions, the soil/root parameters at the pixel where the Seolma-cheon site is located were derived from the calibrated MODIS-based (Chungmi-cheon) soil moisture data. Then, the simulated soil moisture was validated using the measurements at the Seolma-cheon site. The results were slightly overestimated compared to the measurements, but these findings support the applicability of this proposed approach in ungauged regions with predictable uncertainties. These findings showed the potential of this approach in Korea. Thus, this proposed approach can be used to assess root zone soil moisture dynamics at spatio-temporal scales across Korea, which comprises mountainous regions with dense forest.

• 한국산림과학회지
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• 제96권6호
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• pp.730-736
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• 2007

생육환경의 이질성은 수목의 개체군 구조와 동태, 군락의 구성 및 종다양성 유지에 중요한 역할을 한다. 이 연구는 미세지형이 활엽수-잣나무 혼효림에서의 산겨릅나무 개체군의 공간분포에 미치는 영향과 공간분포 양상을 검토하기 위하여 9 ha의 영구 표본구에 있는 유묘, 치수, 살아있는 성숙목과 고사목에 대하여 공간분포 특성을 분석하였다. 그 결과 사면경사에 있어서 산겨릅나무는 비교적 완만한 경사를 선호하였다. 사면 방향별 유묘의 밀도는 차이가 없었고, 치수, 살아 있는 성숙목, 고사목의 밀도는 서향, 동남향에서 높게 나타났다. 살아있는 성숙목의 경우, 150 m 이내의 모든 척도에서 집락분포를 하고 있으며, 척도 30 m에서 최고값을 보였고, 고사목은 111 m 이내에서는 집락분포를 하고. 척도 72 m에서 최고값을 보이고 있으며, 111 m보다 큰 척도에서는 무작위분포를 하고 있었다(P < 0.01). 산겨릅나무의 생육단계별 발생 유사성에 있어서 유묘는 치수와 고도의 정의 상관관계, 치수는 살아 있는 성숙목과 고도의 정의 상관관계, 살아 있는 성숙목은 죽은 성숙목과 고도의 정의 상관관계가 있어 (P < 0.01), 생활사 하위 단계의 발생은 상위단계와 고도의 정의 상관관계가 있음을 알 수 있었다.

• 한국산림과학회지
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• 제99권4호
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• pp.553-558
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• 2010

본 연구는 산불피해 후 자연복원과 소나무 조림을 실시한 지역에서 서식환경과 설치류 개체군의 밀도 차이를 파악하기 위해 강원도 삼척시 검봉산 일대의 2000년도 산불피해 지역에서 2008년 3월에서 12월까지의 기간 동안 수행되었다. 자연복원지과 소나무 조림지에서 각각 3개씩 1 ha 크기의 조사지를 선정하여 2개월 간격으로 각각 4일간의 포획조사 및 서식환경조사를 실시하였다. 서식환경 조사 결과, 하층 피도량 및 치수의 수는 조림지가 자연 복원지에 비해 높은 값을 나타낸 반면, 중층 피도량, 중상층 피도량, 상층 피도량, 교목, 관목의 수, 고사목의 수, 수목잔존물의 양 등은 자연복원지에서 더 높은 값을 나타냈다. 포획 조사 결과 등줄쥐(Apodemus agrarius), 흰넓적다리 붉은쥐(Apodemus peninsulae), 대륙밭쥐(Eothenomys regulus), 다람쥐(Tamias sibiricus) 등 총 4종 688개체가 포획되었다. 설치류의 포획 개체수는 조림지보다 자연복원지가 더 높게 나타났으며, 흰넓적다리붉은쥐, 대륙밭쥐, 다람쥐 등 3종이 조림지보다 더 높은 포획 개체수를 보였다. 이에 비해 등줄쥐는 조림지에서 많이 포획되었다. 등줄쥐와 흰넓적다리붉은쥐는 4월과 12월에 최대 포획개체수를 나타내었으며, 대륙밭쥐는 4월과 6월에, 다람쥐는 6월과 10월에 가장 많은 개체수가 포획되었다. 수목잔존물 제거 및 조림으로 인해 수관층과 하층식생이 개방된 서식 환경은 설치류의 서식에 적합하지 않은 것으로 판단된다. 그러므로 산불 피해 발생후 하층식생 및 수관층이 유지될 수 있도록 산림을 관리하는 것이 설치류의 다양성 유지에 필요할 것으로 생각된다.

• 대한원격탐사학회지
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• 제40권2호
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• pp.203-217
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• 2024

The Land Use, Land-Use Change and Forestry (LULUCF) sector of the National Greenhouse Gas Inventory is crucial for obtaining data on carbon sinks, necessitating accurate estimations. This study analyzes cases of countries applying the LULUCF sector at the Tier 3 level to propose enhanced methodologies for carbon sink estimation. In nations like Japan and Western Europe, satellite spatial information such as SPOT, Landsat, and Light Detection and Ranging (LiDAR)is used alongside national statistical data to estimate LULUCF. However, in Korea, the lack of land use change data and the absence of integrated management by category, measurement is predominantly conducted at the Tier 1 level, except for certain forest areas. In this study, Space-borne LiDAR Global Ecosystem Dynamics Investigation (GEDI) was used to calculate forest canopy heights based on Relative Height 100 (RH100) in the cities of Icheon, Gwangju, and Yeoju in Gyeonggi Province, Korea. These canopy heights were compared with the 1:5,000 scale forest maps used for the National Inventory Report in Korea. The GEDI data showed a maximum canopy height of 29.44 meters (m) in Gwangju, contrasting with the forest type maps that reported heights up to 34 m in Gwangju and parts of Icheon, and a minimum of 2 m in Icheon. Additionally, this study utilized Ordinary Least Squares(OLS)regression analysis to compare GEDI RH100 data with forest stand heights at the eup-myeon-dong level using ArcGIS, revealing Standard Deviations (SDs)ranging from -1.4 to 2.5, indicating significant regional variability. Areas where forest stand heights were higher than GEDI measurements showed greater variability, whereas locations with lower tree heights from forest type maps demonstrated lower SDs. The discrepancies between GEDI and actual measurements suggest the potential for improving height estimations through the application of high-resolution remote sensing techniques. To enhance future assessments of forest biomass and carbon storage at the Tier 3 level, high-resolution, reliable data are essential. These findings underscore the urgent need for integrating high-resolution, spatially explicit LiDAR data to enhance the accuracy of carbon sink calculations in Korea.

• The Korean Journal of Ecology
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• 제22권2호
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• pp.69-77
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• 1999

Secondary vegetation. the holistically integrated system of nature and human being, is the complicated ecosystem that is composed of natural and man-created factors. Understanding the ecological function of secondary vegetation supplies us many important informations for sustainable landscape management and ecological restoration planning. In this research, we tried to examine the shape effect of vegetation patch on early structure of populations of pine and oaks. Moreover. we also tried to clarify the ecological functions of patch edge by exploring the patch effect on germination using patch index. In addition, we present the landscape structure of man -made vegetation of our study area, and setting experimental design of research. Vegetation landscape of study area is typical human disturbed landscape mainly composed of disturbance patches. Vegetation types of graveyard and managed pine forest were controlled by periodically repeated management. However, current seedlings of pine occurred well at both vegetation types. Presence of both saplings were more controlled in managed pine forest (PDM) and graveyard (G) than those of undergrowth (PD) and forest edge (FE) with canopy trees. The number of pine seedlings increased with patch size and patch perimeter. That of oak seedlings was, however, not significantly different. Larger graveyards provided higher light availability for germination of pine seedlings. We think, however, most seedlings of both species in the large sized graveyards without shade will die more easily than that of small sized ones before rainy summer. Relationships between patch shape and germination of two woody species cannot be exactly explained enough yet in these results. More informations on spatial interaction of the total species with differently sized patches are necessary to solve the concept of patch effect on species colonization.

• 한국산림과학회지
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• 제84권3호
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• pp.394-405
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• 1995

온대 삼림지대에서 산화 적지나 개벌 적지에 왕성하게 번성하는 것이 ericaceous속이다. ericaceous속의 식물들은 성장이 빨라서 다른 종과의 경쟁에서 유리하고 또한 allelopathy 효과 때문에 침엽수 갱신에 영향을 미친다. Kalmia가 번성하는 지역에서는 삼림 갱신이 잘 되지 않거나 조림한 침엽수의 생장이 저조하였다. 이러한 생상 저해 현상은 서유럽의 Calluna - Sitca spruce - Scots pine 생태계와 미국의 북서 태평양 지역의 Gaultheria - cedar/hemlock 생태계에서도 나타나고 있다. 삼림이 파괴된 다음에 Kalmia - black spruce 생태계의 다양한 변화는 침엽수 생장을 저해하거나 갱신을 방해하는 원인으로 생각되어지고 있다. 양분경쟁에 대한 논쟁의 여지는 있으나 Kalmia는 black spruce 생장을 억제하는 주원인으로 작용한다. 여러 곳의 야외, 실내 및 온실에서 한 실험 결과는 이러한 결론을 뒷받침해 주고 있다. 본 논문에서는 Kalmia 잎으로부터 8가지의 폐놀물질을 분리동정해 냈으며 이들 중 4가지는 black spruce에 고도의 독성을 나타냈다. Kalmia 우점지역에서 allelopathic 영향을 적게 하므로써 black spruce의 갱신을 증진시키기 위한 여러 가지 방법에 대한 고찰을 하였다.

• 한국기후변화학회지
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• 제8권3호
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• pp.201-211
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• 2017

This study was conducted to investigate the vascular plants which can be an indicator of environmental change in Seseok of Jirisan National Park. The purpose of this study was to find out the basic information for the subalpine species. This study showed that the area had a total 295 taxa including 63 families, 177 genus, 252 species, 2 subspecies, 36 variants 5 forms and Pte-Q was 1.7. Among them, Korea endemic plants were 15 taxa such as Abies koreana. Rare plants were 14 taxa such as Viola diamantiaca. Naturalized plants consisted of 5 taxa such as Rumex crispus. The floristic regional indicator plants found in surveyed area were 72 taxa comprising 3 taxa of grade V, 7 taxa of grade IV and 24 taxa of grade III. In summary, The subalpine plants of the survey region consisted of 37 taxa including Abies koreana and Gymnadenia cucullata. As rare plants distributed in subalpine zone respond sensitively to climate change, accuracy distribution range, environmental characteristics of habitat and population dynamics of rare plants should be evaluated quantitatively.