Tropical peatland ecosystems in Southeast Asia offer essential ecological services but face various threats such as sea level alterations, climate change and human activities. However, our understanding of the origins of peatlands and their dynamics is still limited. Reconstruction of historical vegetation and environmental changes is imperative to comprehend tropical peatlands' origins, evolution and responses to natural factors (e.g., precipitation, sea level) and to human influences (e.g., agriculture). This study employed a multi-proxy palaeoecological analysis, encompassing pollen and spore analysis, macro-charcoal examination, and radiocarbon dating, using a sediment core extracted from the Bram Itam Peatland protection area in Tanjung Jabung Barat, Jambi province. The investigation highlights four distinct palynological periods: from ca. 4750 to 1250 cal yr BP, a dominant mangrove forest thrived in the study area during high sea levels; from 1250 to 450 cal yr BP, as sea levels receded, the mangrove forest was replaced by swampy vegetation, and peatland forests developed under the influence of high precipitation, while agricultural activities with possible rice cultivation were conducted remote from the study area; from 450 cal yr BP to 1950 CE, a mature peatland forest developed. There was no evidence of agricultural practice during this period. After 1950, intensive human activities, including logging, oil palm plantation, and rice cultivation, profoundly impacted the peatland vegetation. The presence of cereal pollen dates back to around 1250 cal yr BP and the introduction of oil palm (Elaeis guineensis) since roughly 1950 CE may indicate potentially enduring changes in agricultural practices of local people in the study area. This study of peatland vegetation dynamics and environmental changes in the Bram Itam peatlands highlights its change from mangrove forest to a matured peatland forest influenced by climate, sea level and human activities.
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