Hapsari, K. Anggi, Jennerjahn, Tim C. ORCID: https://orcid.org/0000-0003-1022-5126, Lukas, Martin C., Karius, Volker and Behling, Hermann (2020) Intertwined effects of climate and land use change on environmental dynamics and carbon accumulation in a mangrove‐fringed coastal lagoon in Java, Indonesia. Global Change Biology . DOI https://doi.org/10.1111/gcb.14926.

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Abstract

The identification and quantification of natural carbon (C) sinks is critical to global climate change mitigation efforts. Tropical coastal wetlands are considered important in this context, yet knowledge of their dynamics and quantitative data are still scarce. In order to quantify the C accumulation rate and understand how it is influenced by land use and climate change, a palaeoecological study was conducted in the mangrove‐fringed Segara Anakan Lagoon (SAL) in Java, Indonesia. A sediment core was age‐dated and analyzed for its pollen and spore, elemental and biogeochemical compositions. The results indicate that environmental dynamics in the SAL and its C accumulation over the past 400 years were controlled mainly by climate oscillations and anthropogenic activities. The interaction of these two factors changed the lagoon's sediment supply and salinity, which consequently altered the organic matter composition and deposition in the lagoon. Four phases with varying climates were identified. While autochthonous mangrove C was a significant contributor to carbon accumulation in SAL sediments throughout all four phases, varying admixtures of terrestrial C from the hinterland also contributed, with natural mixed forest C predominating in the early phases and agriculture soil C predominating in the later phases. In this context, climate‐related precipitation changes are an overarching control, as surface water transport through rivers serves as the “delivery agent” for the outcomes of the anthropogenic impact in the catchment area into the lagoon. Amongst mangrove‐dominated ecosystems globally, the SAL is one of the most effective C sinks due to high mangrove carbon input in combination with a high allochthonous carbon input from anthropogenically enhanced sediment from the hinterland and increased preservation. Given the substantial C sequestration capacity of the SAL and other mangrove‐fringed coastal lagoons, conservation and restoration of these ecosystems is vitally important for climate change mitigation.

Document Type:	Article
Programme Area:	PA3
Research affiliation:	Biogeochemistry and Geology > Ecological Biogeochemistry
Refereed:	Yes
Open Access Journal?:	No
DOI:	https://doi.org/10.1111/gcb.14926
ISSN:	1354-1013
Date Deposited:	08 Jan 2020 14:48
Last Modified:	05 Jun 2024 11:15
URI:	http://cris.leibniz-zmt.de/id/eprint/3283

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