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NTIS 바로가기한국지리정보학회지 = Journal of the Korean Association of Geographic Information Studies, v.21 no.4, 2018년, pp.158 - 174
The leaf area index (LAI) is a major factor explaining the photosynthesis of vegetation, evapotranspiration, and energy exchange between the earth surface and atmosphere, and there have been studies on accurate and applicable LAI estimation methods. This study aimed to investigate the relationship b...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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엽면적지수란 무엇인가? | 식생 및 생물학적 주요 변수 중 하나로서 엽면적지수(LAI: Leaf Area Index)는 산림 식생의 광합성, 증발산, 호흡량 등에 직접적인 관련이 있을 뿐만 아니라 강우나 태양에너지의 차단및 식물과 대기사이의 에너지 교환 등을 설명하는 인자로서 활용되고 있다(Kim, 2008). 엽면적지수는 임관층 총엽면적의 1/2(잎의 한쪽 면) 에 해당하는 면적 합을 지표면 면적으로 나눈 비율로서 단위공간에서 식생이 가지는 모든 입층(leaf layer)의 밀도로 정의할 수 있다. 엽면적지수의 정확한 측정 혹은 예측은 산림생태계의 탄소, 물, 에너지 순환 모델의 정확도를 높이 고, 기후변화로 인한 산림 생태계의 변화와 적응·저감 능력을 평가하거나 예측하는데 필수적 이라고 할 수 있다(Kwon, 2016). | |
엽면적지수 산정방법 중 직접 측정법의 특징은 무엇인가? | 엽면적지수 산정방법으로는 생육상태의 잎을 채취하거나 낙엽을 수거하여 산정하는 직접 측정방법과 광학 측정기 및 원격탐사 기법을 통해 간접적으로 추정하는 방법이 있다. 직접 측정법의 경우 수목, 경작지 등에 대한 정확한 측정이 가능하지만 많은 시간과 인력이 소요되어 넓은 지역에 적용이 어렵다(Chason et al., 1991). | |
정규화식생지수가 LAI 추정에 관한 많은 연구에 적용되고 있는 이유는 무엇인가? | 원격탐사를 통한 LAI 산정은 현지의 실측값과 영상신호(분광 반사율, 식생지수 등)간의 관계식을 통해 산출되는데 주로 식물의 엽록소 농도에 민감한 밴드(630nm~850nm)를 활용한다. 이 범위에 포함되는 적색(630nm~685nm), 근적외선(760nm~850nm) 밴드의 조합으로 만들 어진 정규화식생지수(normalized difference vegetation index: NDVI)는 지표면의 식생량, 잎의 밀도 등과 밀접한 관련이 있어 LAI 추정에 관한 많은 연구에 적용되고 있다(Rouse, 1973; Lee, 2017). 그러나 LAI가 일정 수준 (3. |
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