Conservation set-asides improve carbon storage and support associated plant diversity in certified sustainable oil palm plantations

Susannah Fleiss and Emily H. Waddella and Bernadus Bala Ola and Lindsay F. Banin and Suzan Benedick and Azlin Bin Sailim and Daniel S. Chapman and Ahmad Jelling and Henry King and Colin J. McClean and Kok Loong Yeong and Jane K. Hill (2020) Conservation set-asides improve carbon storage and support associated plant diversity in certified sustainable oil palm plantations. Biological Conservation, 248. pp. 1-10. ISSN 0006-3207

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Abstract

Maintaining forest conservation set-asides is a key criterion of sustainability certification of many crops that drive tropical deforestation, but their value for carbon storage and associated biodiversity is unclear. We conducted vegetation measurements to examine the benefits of set-asides for aboveground carbon stocks (AGC) in certified oil palm plantations on Borneo, and whether their AGC is positively associated with plant diversity. The mean estimated AGC of live trees and palms ≥10 cm diameter in set-asides in certified oil palm plantations (52.8 Mg ha−1) was >1.5-times that of oil palm (30.3 Mg ha−1), with some plots supporting similar AGC to primary forest. For lowland Borneo, we estimate that the average AGC of oil palm plantations with 10% coverage of set-asides is up to 20% greater than the average AGC of oil palm plantations without set-asides, newly demonstrating carbon storage as a benefit of conservation set-asides. We found positive relationships between AGC and plant diversity, highlighting the carbon–biodiversity co-benefits of set-asides. However, set-asides had a lower density of tree seedlings than continuous primary forest, indicating potential suppression of future tree regeneration and AGC. Our findings support the application of zero-deforestation during agricultural development, to conserve areas of remaining forest with high AGC and high biodiversity. We recommend management practices that boost regeneration in existing set-asides (e.g. enrichment planting), which would be most effective in larger set-asides, and could substantially increase the AGC of agricultural landscapes without removing land from production, and help conserve forest-dependent biodiversity.

Item Type:	Article
Keyword:	Climate mitigation , Conservation set-aside , Forest fragment , Oil palm , Sustainable agriculture , Tropical forest
Subjects:	S Agriculture > S Agriculture (General) > S1-(972) Agriculture (General) > S600-600.7 Agricultural meteorology. Crops and climate
Department:	FACULTY > Faculty of Sustainable Agriculture
Depositing User:	SITI AZIZAH BINTI IDRIS -
Date Deposited:	24 Sep 2021 15:30
Last Modified:	24 Sep 2021 15:30
URI:	https://eprints.ums.edu.my/id/eprint/29270

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