Carbon and water cycling in two rubber plantations and a natural forest in Mainland Southeast Asia

Wang Xueqiang, Blanken Peter D., Kasemsap Poonpipope, Petchprayoon Pakorn, Thaler Philippe, Nouvellon Yann, Gay Frédéric, Chidthaisong Amnat, Sanwangsri Montri, Chayawat Chompunut, Chantuma Pisamai, Sathornkich Jate, Kaewthongrach Rungnapa, Satakhun Duangrat, Phattaralerphong Jessada. 2022. Carbon and water cycling in two rubber plantations and a natural forest in Mainland Southeast Asia. Journal of Geophysical Research: Biogeosciences, 127 (5):e2022JG006840, 21 p.

Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.6474360 / Url - jeu de données - Entrepôt autre : https://www.ncdc.noaa.gov/cdo-web/datasets

Résumé : Rubber plantations have rapidly replaced natural forests (NFs) in Mainland Southeast Asia, yet the relevant impacts on the terrestrial carbon cycle remain uncertain especially with an increase in drought frequency. Our study compared eddy-covariance measurements of carbon and water fluxes from two rubber monoculture plantations (at a northern marginal site and a southern traditional plantation site) with a second-growth NF between 2015 and 2018, and their responses to a prolonged drought during 2015/2016. The NF had higher light use efficiency, water use efficiency and gross primary productivity (GPP, 2.94 ± 0.41 kg C m−2 yr−1) than the northern rubber (NR) monoculture (2.45 ± 0.17 kg C m−2 yr−1), while lower ecosystem carbon use efficiency (eCUE) caused a lower net ecosystem productivity (NEP, 0.75 ± 0.25 kg C m−2 yr−1) compared to the plantation (1.19 ± 0.22 kg C m−2 yr−1). Drought decreased the NF eCUE by 23% with significant carbon uptake restrictions across multiple seasons, while the rubber GPP reduction was only substantial in the warm-dry season with an overall 17% decline in eCUE. The NR site's GPP was mainly controlled by soil water content throughout the year. Higher light availability offset the negative effect of drier conditions on the rubber GPP, resulting in larger carbon uptake compared to the southern plantation (GPP, 2.12 ± 0.12 kg C m−2 yr−1; NEP, 1.07 ± 0.14 kg C m−2 yr−1). In contrast, the NF GPP was mainly restricted by vapor pressure deficit, especially during the drought.

Mots-clés Agrovoc : plantations, grande exploitation, Hévéa, Hevea brasiliensis, forêt primaire, analyse de covariance, méthode statistique, relevé (des données), carbone, bilan hydrique du sol

Mots-clés géographiques Agrovoc : Cambodge, République démocratique populaire lao, Myanmar, Thaïlande, Viet Nam

Mots-clés complémentaires : bilan carbone, carbone forestier

Classification Agris : K10 - Production forestière
P01 - Conservation de la nature et ressources foncières

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Wang Xueqiang, University of Colorado Boulder (USA) - auteur correspondant
• Blanken Peter D., University of Colorado (USA)
• Kasemsap Poonpipope, Kasetsart University (THA)
• Petchprayoon Pakorn, Geo-Informatics and Space Technology Development Agency (THA)
• Thaler Philippe, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0002-9924-4309
• Nouvellon Yann, CIRAD-PERSYST-UMR Eco&Sols (THA) ORCID: 0000-0003-1920-3847
• Gay Frédéric, CIRAD-PERSYST-UMR ABSys (FRA) ORCID: 0000-0002-7624-8489
• Chidthaisong Amnat, KMUTT (THA)
• Sanwangsri Montri, Chiang Mai University (THA)
• Chayawat Chompunut, Kasetsart University (THA)
• Chantuma Pisamai, Chachoengsao Rubber Research Center (THA)
• Sathornkich Jate, Kasetsart University (THA)
• Kaewthongrach Rungnapa, Geo-Informatics and Space Technology Development Agency (THA)
• Satakhun Duangrat, Kasetsart University (THA)
• Phattaralerphong Jessada, Kasetsart University (THA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/600978/)

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