Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Relationship between gross primary production and environmental variables during drought season in South Korea

가뭄 기간 총일차생산량과 환경 변수 간 상관관계 분석

  • Park, Jongmin (School of Civil, Architectural Enginnering and Landscape Architecture, Sungkyunkwan University) ;
  • Lee, Dalgeun (Disaster Information Research Division, National Disaster Management Research Institute) ;
  • Park, Jinyi (Disaster Information Research Division, National Disaster Management Research Institute) ;
  • Choi, Minha (School of Civil, Architectural Engineering and Landscape Architecture, Sungkyunkwan University)
  • 박종민 (성균관대학교 건설환경시스템공학과) ;
  • 이달근 (국립재난안전연구원 재난정보연구실) ;
  • 박진이 (국립재난안전연구원 재난정보연구실) ;
  • 최민하 (성균관대학교 건설환경공학부)
  • Received : 2021.06.11
  • Accepted : 2021.07.30
  • Published : 2021.10.31
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Abstract

Water stress and environmental drivers are important factors to explain the variance of gross primary production (GPP). Environmental drivers are used to generate GPP in Moderate Resolution Imaging Spectroradiometer (MODIS) algorithm and process-based model. However, MODIS algorithm only consider the vapor pressure deficit (VPD) data while the process-based biogeochemical model also uses limited data to express water stress. We compared the relationship between environmental drivers and GPP from eddy covariance method, MODIS algorithm, and Community Land Model 4 (CLM 4) simulation in normal years and drought years. To consider water stress specifically, we used VPD and evaporative fraction (EF). We evaluated the effects from environmental drivers and EF towards GPP products using the structural equation modeling (SEM) in South Korea. We found that GPP products from MODIS algorithm and model simulation results were not restricted from VPD data if VPD was underestimated. We also found that in the cropland area, irrigation effects can relieve VPD effects to GPP. However, GPP products derived from MODIS and CLM 4 had limitation to explain the irrigation effects to GPP. Overall, these results will enhance the understanding of GPP products derived from MODIS and CLM 4.

총일차생산량은 물 스트레스와 환경 변수에 의해 크게 영향을 받는다. 총일차생산량과 환경변수의 상관관계는 Moderate Resolution Imaging Spectroradiometer (MODIS) 알고리즘과 process-based model에 적용되어 총일차생산량을 계산하는데 활용된다. 그러나 MODIS 알고리즘에서는 물 스트레스를 수증기압차이(vapor pressure deficit)로만 고려하고 있으며, process-based model에서도 제한된 변수만으로 물 스트레스를 표현하여 총일차생산량을 산출하고 있다. 본 연구에서는 에디 공분산 기법, MODIS 알고리즘, 그리고 Community Land Model 4 (CLM 4) 시뮬레이션 결과에서 얻어진 총일차생산량이 환경 변수와 가지는 상관관계를 평년과 가뭄연도를 대상으로 분석하였다. 물 스트레스를 대표하는 지수는 수증기압차이와 evaporative fraction (EF)가 사용되었다. 본 연구에서는 structural equation modeling (SEM)을 활용하여 환경 변수와 EF가 총일차생산량에 끼치는 영향을 수치화하여 평가하였다. SEM을 통해 상관성을 분석한 결과, 수증기압차이가 과소평가될 경우 MODIS 알고리즘과 CLM 4 시뮬레이션에서 생산된 총일차생산량이 수증기압차이로부터 받는 영향이 제한적임을 확인하였다. 에디 공분산 기법으로 산출한 총일차생산량의 상관성 분석 결과, 경작지에서는 관개작업으로 인해 수증기압차이가 총일차생산량에 끼치는 영향이 감소하였으나 MODIS와 CLM 4에서 산출된 총일차생산량 데이터는 이러한 관개작업의 영향을 설명하는데 제한적이었다. 본 연구결과는 MODIS와 CLM 4에서 산출된 총일차생산량의 특성을 이해하고 한계를 분석하는 연구에 도움을 줄 것으로 예상된다.

Keywords

Acknowledgement

This research was supported by a grant (2021-MOIS37-002) of "Intelligent Technology Development Program on Disaster Response and Emergency Management" funded by Ministry of Interior and Safety (MOIS, Korea). This work was supported by BK21 FOUR Project.

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