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Nutrient balance as a tool for maintaining yield and mitigating environmental impacts of Acacia plantation in drained tropical peatland — description of plantation simulator

Laurén, Ari; Palviainen, Marjo; Page, Susan; Evans, Chris ORCID: https://orcid.org/0000-0002-7052-354X; Urzainki, Iñaki; Hökkä, Hannu. 2021 Nutrient balance as a tool for maintaining yield and mitigating environmental impacts of Acacia plantation in drained tropical peatland — description of plantation simulator. Forests, 12 (3), 312. 29, pp. https://doi.org/10.3390/f12030312

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Abstract/Summary

Responsible management of Acacia plantations requires an improved understanding of trade-offs between maintaining stand production whilst reducing environmental impacts. Intensive drainage and the resulting low water tables (WT) increase carbon emissions, peat subsidence, fire risk and nutrient export to water courses, whilst increasing nutrient availability for plant uptake from peat mineralization. In the plantations, hydrology, stand growth, carbon and nutrient balance, and peat subsidence are connected forming a complex dynamic system, which can be thoroughly understood by dynamic process models. We developed the Plantation Simulator to describe the effect of drainage, silviculture, fertilization, and weed control on the above-mentioned processes and to find production schemes that are environmentally and economically viable. The model successfully predicted measured peat subsidence, which was used as a proxy for stand total mass balance. Computed nutrient balances indicated that the main growth-limiting factor was phosphorus (P) supply, and the P balance was affected by site index, mortality rate and WT. In a scenario assessment, where WT was raised from −0.80 m to −0.40 m the subsidence rate decreased from 4.4 to 3.3 cm yr−1, and carbon loss from 17 to 9 Mg ha−1 yr−1. P balance shifted from marginally positive to negative suggesting that additional P fertilization is needed to maintain stand productivity as a trade-off for reducing C emissions.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.3390/f12030312
UKCEH and CEH Sections/Science Areas: Soils and Land Use (Science Area 2017-)
ISSN: 1999-4907
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: carbon, drainage, ecosystem modelling, fertilization, growth, peat subsidence, phosphorus, water table
NORA Subject Terms: Ecology and Environment
Agriculture and Soil Science
Date made live: 12 Mar 2021 12:45 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/529887

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