EVALUATING the GROSS PRIMARY PRODUCTION (GPP) in DIFFERENT AGRICULTURAL LAND USE TYPES in the VIETNAMESE MEKONG DELTA USING VEGETATION PHOTOSYNTHESIS MODEL (VPM)

Conference proceedings article

Authors/Editors

Strategic Research Themes

Earth System & Climate Change (Sustainable Energy & Environment)

Publication Details

Author list: Diem P.K., Diem N.K., Varnakovida P., Chidthaisong A.

Publisher: Asian Association on Remote Sensing

Publication year: 2021

ISBN: 9781713843818

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127396593&partnerID=40&md5=d0a6336a11f1ceff02fca804e8172e1b

Languages: English-Great Britain (EN-GB)

Abstract

Research aims to estimate the gross primary production (GPP) on different agricultural land use types in the Vietnamese Mekong Delta (VMD) using the vegetation photosynthesis model (VPM). The data of air temperature and the Photosynthetically active radiation (PAR) collected at the meteorological stations in VMD were used to calculate the effect of temperature on plants (Tscalar). The Land Surface Water Index (LSWI), and the Enhanced Vegetation Index (EVI) extracted from remote sensing data (MODIS MOD09A1) were used to calculate the effect of water (Wscalar) and growth stages (Pscalar). The light use efficiency (ϵg) on different agricultural land use types is calculated through the optimal amount of light combined with temperature and water for each growth stage. The GPP was then calculated using PAR, ϵg and EVI. The result shows that, by 2018, GPP was estimated at 8,093.67 tons C/year in the VMD. In which, the double rice crop accounts for about 3,282.14 tons C/year (40.55%), triple rice crop about 3,240.25 tons C/year (40%), Rice - Upland crop about 201.19 tons C/year year (2.49%), Rice - Shrimp about 376.26 tons C/year (4.65%), and forest with about 993.82 tons C/year (12.28%). In general, rice cultivation contributed the largest share to the gross primary production for the whole region (80.96%). This study also indicates that GPP estimation from the VPM model can be used to consider carbon uptake in the large region which is supported for environment management. © ACRS 2021.All right reserved.

Keywords

Gross primary production, vegetation photosynthesis model, Vietnamese Mekong Delta