Spatiotemporal variations and driving factors of buried organic carbon in mangrove sediments of China: Based on δ13C values

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2024-11-28 DOI:10.1016/j.catena.2024.108571

Bingshuai Liu , Peng Xia , Yao Zhang , Jun Du , Xianen Luo

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引用次数: 0

Abstract

Mangroves, as significant coastal carbon reservoirs, play a pivotal role in the global carbon cycle. However, the detailed data on mangrove organic carbon (OC) burial is patchy in China, owing to regional discrepancies in spatiotemporal variations and driving factors. To fill this gap, the end-member mixing models based on δ¹³C and C/N values were used to calculate the relative contributions of terrestrial, mangrove, and marine OC, based on 28 sediment cores collected from five typical mangroves in China. The organic carbon burial flux (OCBF) and stocks (OCS) were calculated to be 133.93 ± 106.56 (n = 28) g C m⁻² yr⁻¹ and 126.91 ± 52.45 (n = 28) Mg C ha⁻¹, respectively, which were lower than the global averages. The study indicated that there were no significant latitudinal variations in mangrove OCS. The reason was that these sampling sites in high latitudes were mostly located at estuaries, exhibiting relatively higher sedimentation rates. The increase in terrestrial OC derived from river inputs effectively offset the decline in mangrove productivity. Therefore, sedimentation rates should be the main driving factor for spatiotemporal variations of mangrove OC burial in China.

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.