• Journal of Ecology and Environment
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• 제33권4호
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• pp.363-376
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• 2010

Vegetative communities of created wetlands often display lower species richness, less cover, higher occurrence of non-native or invasive species, and fewer obligate wetlands species than those in natural wetlands, thus failing to meet basic success criteria for wetland mitigation. This study examined the effects of two design elements, disking-induced microtopography and hydrologic regime, on the first year vegetation development pattern of a mitigation wetland newly created in the Virginia piedmont. Elevation and species cover were measured along replicate multiscale circular transects in two adjacent wetland sites that are different in their hydrologic regime. Two microtopographic indices, tortuosity (T) and limiting elevation difference (LD), were calculated from the elevation measurements. Both indices were higher in disked plots than non-disked plots, showing the effect of disking on microtopography. Out of forty-one vegetation taxa observed in the wetland, 29 taxa were naturally colonized and 12 taxa were seeded. All plots except one non-disked plot were dominated by wetland vegetation. Species richness and diversity were higher in disked than in non-disked plots. Vegetation community development seemed also influenced significantly by hydrologic regime of the site. The effect of microtopography on species richness and diversity was more pronounced in a relatively dry site compared to a wet site. In addition, percent cover, species richness and diversity of vegetation were positively correlated with microtopographic indices such as T and LD. Two design elements, microtopography and hydrologic regime, should be considered and incorporated in wetland creation to enhance plant community development.

• 한국환경복원기술학회지
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• 제18권3호
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• pp.13-22
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• 2015

Unpaved forest roads are common accessways in mountain areas being used for forestry purposes. The presence of forest roads produces large volumes of surface runoff and sediment yield due to changes in soil properties and hillslope profile. Rainfall simulation experiments were conducted to estimate the impacts of above-ground vegetation and antecedent soil water condition on hydrology and sediment processes. A total of 9 small plots($1m{\times}0.5m$) were installed to represent different road surface conditions: no-vegetation(3 plots), vegetated surface(3 plots), and cleared vegetation surface(3 plots). Experiments were carried out on dry, wet, and very wet soil moisture conditions for each plot. Above ground parts of vegetation on road surface influenced significantly on surface runoff. Runoff from no-vegetation roads(39.24L) was greater than that from vegetated(25.05L), while cleared-vegetation condition is similar to no-vegetation roads(39.72L). Runoff rate responded in a similar way to runoff volume. Soil erosion was also controlled by land cover, but the magnitude is little than that of surface runoff. Even though slight differences among antecedent soil moisture conditions were found on both runoff and soil erosion, runoff rate and soil losses were increased in very wet condition, followed by wet condition. The experiments suggest that vegetation cover on forest road surface seems most effective way to reduce surface runoff and soil erosion during storm periods.

• 전자공학회논문지CI
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• 제49권2호
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• pp.83-89
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• 2012

지구의 중요한 천연자원인 산림을 포함한 자연 식생환경은 지난 1세기 동안 많은 변화를 겪으며 기후에도 영향을 미치게 되어 현재 지구적 차원의 관심 속에서 다양한 연구가 진행되고 있다. 원격탐사는 분광적 특성을 이용하여 식생의 특성을 탐지할 수 있어 식생자원을 모니터링하는데 매우 효율적인 수단이다. 이러한 연구에서는 보통 원격탐사 측정을 분석하여 관찰된 화소가 식생을 포함하고 있는 정도를 나타내는 식생지수가 사용되고 있는데 NDVI가 이중 가장 많이 사용되는 식생지수이다. 본 논문에서는 MODIS NDVI 시계열 자료를 이용하여 자동으로 식생의 변화를 탐지해 가는 방법론이 제안되어 있다. 변화탐지를 위해 비모수 방법의 신경망 모형이 사용되었고 특성벡터로는 한 화소에서 다중 시기의 NDVI 차이와 더불어 NDVI 시계열 자료의 시간상의 관계가 함께 고려될수 있도록 제안되었다. 사용된 모형의 테스트를 위해 2006년부터 2011년까지 한반도 지역에 대한 MODIS MYD13Q1 자료가 사용되었다.

• 대한원격탐사학회지
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• 제29권5호
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• pp.537-544
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• 2013

남극 세종 과학 기지가 위치하고 있는 바톤반도는 눈과 식생이 주를 이루고 있고, 기후변화와 같은 환경변화에 민감하게 반응한다. 극지역의 지표 모니터링은 기후변화 이해를 위해 중요하다. 그러나 극 지역은 접근성 및 공간규모로 인해 지속적으로 모니터링 하기에 어려움이 있다. 위성영상은 지속적으로 동일지역을 모니터링 할 수 있다는 장점과 함께 다중분광영역을 이용하여 지표의 상태를 파악하는데 효율적이다. 따라서 본 연구에서는 바톤반도의 지표의 상태를 지속적으로 모니터링하기 위한 기초자료로 KOMPSAT-2 다중 분광 위성영상을 이용하여 토지피복분류를 수행하였고, 나아가 분류된 토지피복 중 식생 종의 분포를 파악하였다. 다중분광영상인 KOMPSAT-2 위성영상과 현장관측자료를 이용하여 계층적 분류를 수행하였고 정확도를 평가하였다. 전반적으로 식생지역과 비식생 지역이 명확하게 분류되었으나 식생 종 분류에는 낮은 정확도를 보였다.

• 대한공간정보학회지
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• 제24권3호
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• pp.39-47
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• 2016

본 연구는 몽골 Tuul-basin 지역의 토지피복변화 상태와 토지황폐화에 대한 분석을 위해 1990, 2001, 2011년의 녹색식물의 활력도가 가장 높은 여름의 Landsat 위성영상을 활용하였다. 몽골 Tuul-Basin 지역의 시계열 데이터를 이용하여, 정규식생지수(NDVI, normalized difference vegetation index), 토양조절 식생지수(SAVI, soil-adjusted vegetation index), 지표면온도(LST, land surface temperature)를 계산하여 토지피복변화 분석을 하였다. 그 결과 연구지역 전체 지역의 산림 및 녹지는 감소되고, 건조지역, 휴경지는 증가된 것으로 나타났으며, 점진적으로 토지가 황폐화되어 감을 알 수 있었다. 또한 LST와 식생지수의 상관성 분석을 실시한 결과, 높은 상관관계를 나타내었으며, 이는 대상지역의 토지피복변화나 식생의 활력도가 지표면의 온도와 밀접하게 관계가 있다는 것을 알 수 있었다.

• 대한원격탐사학회지
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• 제25권2호
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• pp.175-184
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• 2009

본 연구에서는 변화하고 있는 지표를 파악하기 위하여 기존황사발원지인 고비사막과 새로운 황사발원지로 주목받고 있는 만주에 대한 토지피복 비교 분석을 수행하였다. 이를 위해 1999년과 2007년의 SPOT VEGETATION(VGT) 센서로부터 취득된 Normalized Difference Vegetation Index (NDVI) 10-day 자료를 사용하였다. 효율적으로 식물의 변화를 탐지하기 위해 NDVI패턴을 분석하고, 식생의 밀도에 따라 level로 분류하여 식생상태를 비교하였다. 그 결과 모든 level을 통해 황사발원지들의 동진추세를 확인할 수 있었다. 또한 기존의 황사발원지였던 고비사막과 황토고원은 positive한 변화를 보인 반면 새로운 황사발원지인 내몽골 고원과 만주는 negative한 변화를 보임을 관찰하였다. 특히 만주는 다른 황사발원지들과 다르게 사막이나 나지의 특성을 가지고 있지는 않으나 지속적으로 negative하게 변화함을 SPOT VGT의 1999년에서 2007년까지 9년 동안의 자료를 분석하여 확인하였다.

• Journal of Forest and Environmental Science
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• 제25권1호
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• pp.49-55
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• 2009

The present study analyses the effect of land use on the vegetation of some desert ecosystems in Abu Dhabi, United Arab Emirates (UAE). Three sites were selected to represent different types of land use, inside Umm Al-Banadeq forest, outside the forest and along Abu Dhabi-Al Ain Trucks Road. In total, fifty-two stands were examined; including a matrix of 14 species ${\times}$ 52 stands. Based on species cover data, stands were classified using TWINSPAN and ordinated using DCA. Four vegetation groups were generated at level three of classification. Zygophyllum mandavillei was dominant in most vegetation groups; Heliotropium bacciferum dominated vegetation groups inhabited the forest. Species richness, species turnover, relative evenness and relative concentration of dominance of forest vegetation groups were 2.8, 5.7, 0.7, and 2.0, respectively. The differences were attributed to both natural variability and forestry-induced changes, including change in land use, drainage and ploughing and shading by trees. Vegetation group inhabited Abu Dhabi-Al Ain Trucks Road, that were dominated by Haloxylon salicornicum and Zygophyllum mandavillei have high total cover (8.8 m per $m^{-1}$). Most community and vegetation attributes were significantly higher inside the forest than outside. Human interventions and environmental factors affected species diversity and abundance of these communities.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.908-910
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• 2003

In this paper the extraction method for the best suitable green vegetation area in urban area, Daegu, Korea, was developed using satellite images (1994, 1999, Landsat TM). For this, the GIS overlay analysis of GVI (Green Vegetation Index), SBI (Soil Brightness index), NWI (None-Such wetness Index) was performed to estimate the best suitable green vegetation area. Also, the statistical documents, algorithm and Tasseled-Cap index were used to recognize the change of land cover such as cultivation area, urban area, and damaged area. Through the result of this study, it is possible to monitor the large sized reclamation of land by drainage or damaged area by forest fires. Moreover, information with the change of green vegetation and the status of cultivation by GVI, but also moisture content by percentage by NWI and surface class by SBI can be obtained.

• 한국지형학회지
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• 제25권3호
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• pp.105-120
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• 2018

This study estimates possibility and limitation on production of DEM using aerial photo by comparison of DEMs using aerial photo and digital map. Mountain and urban areas show higher elevation in DEM using aerial photo than in DEM using digital map, due to height of vegetation cover and buildings, respectively. However, artificial affects due to bridge, embankment and road construction are responsible for areas with higher elevation in DEM using digital map than in DEM using aerial photo. This difference in elevation between DEMs seems to be caused by rapid change in real elevation that is not reflected in digital map. There is little difference in elevation between DEMs in plain and area with little or no vegetation cover. This study suggests that problems associated with vegetation cover and error by GCP should be fixed, although DEM using aerial photo can quantitatively and 3-dimensionally reconstruct topography with a high resolution.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.1335-1339
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• 2004

A hydro-geomorphologic change in a sand bed channel reach and vegetation expansion by changes in the How regime is analyzed in this study. Field and aerial photo surveys, basic hydrological analysis about flow regime change due to two dams, Andong Dam and Imha Dam, on the upstream river and computer modeling are conducted. Two Dams in the study reach have obviously affected downstream channel in many ways including the bed particle coarsening, vegetation expansion on the sandbars and following river channel braiding. The phenomenon of no vegetation on the large point bar in front of Hahwe Village seems due to disturbance of the sandbar surface probably due to the cross flow in the meander reach during the flood. Another reason for no vegetation is that the sandbar on this reach has lower subsurface water lovels, as compared with the others in the up- and downstream of the reach where vegetation expanded, which would hinder vegetation from germinating and growing on the sandbar.