Estimating oil-palm Si storage, Si return to soils, and Si losses through harvest in smallholder oil-palm plantations of Sumatra, Indonesia
نویسندگان
چکیده
Abstract. Most plant-available Si in strongly desilicated soils is provided through litter decomposition and subsequent phytolith dissolution. The importance of silicon (Si) cycling tropical soil–plant systems raised the question whether oil-palm (Elaeis guineensis Jacq.) cultivation alters cycling. As oil palms are considered hyper-accumulators, we hypothesized that much stored above-ground biomass with time. Furthermore, system might lose considerable amounts every year fruit-bunch harvest. To test these hypotheses, analysed concentrations stalks, fruit pulp kernels, leaflets, rachises, frond bases mature on eight smallholder plantations Sumatra, Indonesia. We estimated storage total palms, return to decomposing pruned palm fronds, losses from Leaflets fronds had a mean concentration > 1 wt %. All other plant parts < 0.5 % Si. According our estimates, single tree about 4–5 kg its biomass. A plantation at least 550 ha−1 trees' Pruned returned 111–131 topsoils each year. Fruit-bunch harvest corresponded an annual export 32–72 2015 2018. Greater (of ha−1) would occur if stems were removed prior replanting. Therefore, it advisable leave plantations, e.g. by distributing chipped stem across end cycle (∼ 25 years).
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ژورنال
عنوان ژورنال: Biogeosciences
سال: 2023
ISSN: ['1726-4189', '1726-4170']
DOI: https://doi.org/10.5194/bg-20-1259-2023