2024-03-19T05:34:55Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1355362018-07-17T07:08:36Zcom_10261_88com_10261_8col_10261_341
00925njm 22002777a 4500
dc
Serrano, Oscar
author
Ricart, Aurora M.
author
Lavery, Paul S.
author
Mateo, Miguel Ángel
author
Arias-Ortiz, Ariane
author
Masqué, Pere
author
Rozaimi, M.
author
Steven, Andy D. L.
author
Duarte, Carlos M.
author
2016
Biotic and abiotic factors influence the accumulation
of organic carbon (Corg/ in seagrass ecosystems.We surveyed
Posidonia sinuosa meadows growing in different water
depths to assess the variability in the sources, stocks and
accumulation rates of Corg. We show that over the last 500
years, P. sinuosa meadows closer to the upper limit of distribution
(at 2–4m depth) accumulated 3- to 4-fold higher Corg
stocks (averaging 6.3 kgCorg m2/ at 3- to 4-fold higher rates
(12.8 gCorg m2 yr1/ compared to meadows closer to the
deep limits of distribution (at 6–8m depth; 1.8 kg Corg m2
and 3.6 g Corg m2 yr1/. In shallower meadows, Corg stocks
were mostly derived from seagrass detritus (88% in average)
compared to meadows closer to the deep limit of distribution
(45% on average). In addition, soil accumulation rates
and fine-grained sediment content (< 0.125 mm) in shallower
meadows (2.0mmyr1 and 9 %, respectively) were approximately
2-fold higher than in deeper meadows (1.2mmyr1
and 5 %, respectively). The Corg stocks and accumulation
rates accumulated over the last 500 years in bare sediments
(0.6 kgCorg m2 and 1.2 g Corg m2 yr1/ were 3- to 11-fold
lower than in P. sinuosa meadows, while fine-grained sediment
content (1 %) and seagrass detritus contribution to the
Corg pool (20 %) were 8- and 3-fold lower than in Posidonia
meadows, respectively. The patterns found support the hypothesis
that Corg storage in seagrass soils is influenced by
interactions of biological (e.g., meadow productivity, cover
and density), chemical (e.g., recalcitrance of Corg stocks) and
physical (e.g., hydrodynamic energy and soil accumulation
rates) factors within the meadow. We conclude that there is
a need to improve global estimates of seagrass carbon storage
accounting for biogeochemical factors driving variability
within habitats.
Biogeosciences 13 : 4581-4594 (2016)
1726-4170
http://hdl.handle.net/10261/135536
10.5194/bg-13-4581-2016
Key biogeochemical factors affecting soil carbon storage in Posidonia meadows