Intertwined effects of climate and land use change on environmental dynamics and carbon accumulation in a mangrove‐fringed coastal lagoon in Java, Indonesia

2019 | journal article. A publication with affiliation to the University of Göttingen.

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​Intertwined effects of climate and land use change on environmental dynamics and carbon accumulation in a mangrove‐fringed coastal lagoon in Java, Indonesia​
Hapsari, K. A.; Jennerjahn, T. C.; Lukas, M. C.; Karius, V.   & Behling, H. ​ (2019) 
Global Change Biology26(3) pp. 1414​-1431​.​ DOI: https://doi.org/10.1111/gcb.14926 

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Authors
Hapsari, K. Anggi; Jennerjahn, Tim C.; Lukas, Martin C.; Karius, Volker ; Behling, Hermann 
Abstract
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.
Our interdisciplinary research reveals that the interaction between climate and human activities controlled the Segara Anakan Lagoon’s (SAL) carbon‐environmental dynamic by changing its sediment supply and salinity, hence altered the organic matter composition and deposition. In coastal ecosystems strongly connected to their watershed like the SAL, climate is an overarching control of the "delivery of effects" of anthropogenic activities in the catchment area. Amongst other mangrove‐dominated ecosystems globally, the SAL is one of the most effective C sinks. Conservation and restoration of the SAL and other mangrove‐fringed coastal lagoons with high C sink capacity are vital for climate change mitigation. image
Issue Date
2019
Journal
Global Change Biology 
Organization
Abteilung Sedimentologie und Umweltgeologie ; Geowissenschaftliches Zentrum ; Fakultät für Geowissenschaften und Geographie 
ISSN
1354-1013
eISSN
1365-2486
ISSN
1354-1013
eISSN
1365-2486
Language
English
Sponsor
Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
Bundesministerium für Bildung und Forschung http://dx.doi.org/10.13039/501100002347
German Academic Exchange Service http://dx.doi.org/10.13039/501100001655

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