Forest migration and carbon sources to Iranian mangrove soils (original) (raw)
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Research Square (Research Square), 2021
Despite the increasing interest on mangroves due to their recognition as one of the most carbon rich ecosystem, arid mangroves are still poorly investigated. We aimed to improve the knowledge on biomass and soil carbon sequestration for an arid mangrove forest located at the Azini creek, Sirik, Hormozgan Province (Iran). Three different regions were considered based on the composition of the principal species growing in the study area: 1) Avicennia marina, 2) mixed forest of A. marina and Rhizophora mucronata, and 3) R. mucronata. Biomass carbon storage, considering both aboveground (AGB) and belowground biomass (BGB), was signi cantly different between the cover areas. Signi cantly higher values of soil organic carbon stock were found in the sites under Rhizophora spp. than in the site with pure stand of Avicennia spp.. Overall, the mean forest biomass (TFB) was 305 Mg ha-1 and the highest proportion of organic carbon (62 %) was found to be stored in the soil, while the lowest was located in the root biomass (BGB; 10%). The AGB accounted for about 28% of the C stored in the studied site, with signi cant differences between the three vegetation areas. Our results on carbon storage can be used by local policy to promote conservation actions in arid mangrove forests, which also represent an important climatic threshold of mangrove worldwide distribution.
Organic carbon burial and sources in soils of coastal mudflat and mangrove ecosystems
CATENA, 2020
Mangrove organic carbon is primarily stored in soils, which contain more than two-thirds of total mangrove ecosystem carbon stocks. Despite increasing recognition of the critical role of mangrove ecosystems for climate change mitigation, there is limited understanding of soil organic carbon sequestration mechanisms in undisturbed low-latitude mangroves, specifically on organic carbon burial rates and sources. This study assessed soil organic carbon burial rates, sources and stocks across an undisturbed coastal mudflat and mangrove hydrogeomorphological catena (fringe mangrove and interior mangrove) in Bintuni Bay, West Papua Province, Indonesia. 210 Pb radionuclide sediment dating, and mixing model of natural stable isotope signatures (δ 13 C and δ 15 N) and C/N ratio were used to estimate organic carbon burial rates and to quantify proportions of allochthonous (i.e., upland terrestrial forest) and autochthonous (i.e., on-site mangrove forest) organic carbon in the top 50 cm of the soil. Burial rates were in the range of 0.21-1.19 Mg C ha −1 yr −1. Compared to the fringe mangroves, organic carbon burial rates in interior mangroves were almost twice as high. Primary productivity of C 3 upland forest vegetation and mangroves induced soil organic carbon burial in interior mangroves and this was consistent with the formation of the largest organic carbon stocks (179 ± 82 Mg C ha −1). By contrast, organic carbon stored in the fringe mangrove (68 ± 11 Mg C ha −1) and mudflat (62 ± 10 Mg C ha −1) soils mainly originated from upland forests (allochthonous origin). These findings clearly indicate that carbon sequestered and cycling in mangrove and terrestrial forest ecosystems are closely linked, and at least a part of carbon losses (e.g., erosion) from terrestrial forests is buried in mangrove ecosystems.
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Soil Organic Carbon in Mangrove Ecosystems with Different Vegetation and Sedimentological Conditions
Journal of Marine Science and Engineering, 2015
A large number of studies have been conducted on organic carbon (OC) variation in mangrove ecosystems. However, few have examined its relationship with soil quality and stratigraphic condition. Mangrove OC characteristics would be explicitly understood if those two parameters were taken into account. The aim of this study was to examine mangrove OC characteristics qualitatively and quantitatively after distinguishing mangrove OC from other OC. Geological survey revealed that the underground of a mangrove ecosystem was composed of three layers: a top layer of mangrove origin and two underlying sublayers of geologic origin. The underlying sublayers were formed from different materials, as shown by X-ray fluorescence analysis. Despite a large thickness exceeding 700 cm in contrast to the 100 cm thickness of the mangrove mud layer, the sublayers had much lower OC stock. Mangrove mud layer formation started from the time of mangrove colonization, which dated back to between 1330 and 1820 14 C years BP, and OC stock in the mangrove mud layer was more than half of the total OC stock in the underground layers, which had been accumulating since 7200 14 C years BP. pH and redox potential (Eh) of the surface soils varied depending on vegetation type. In the surface soils, pH correlated to C% (r = −0.66, p < 0.01). C/N ratios varied widely from 3.9 to 34.3, indicating that mangrove OC had various sources. The pH
Mangroves can store carbon in plant materials and soil pools (Howard et al., 2014). However, most of the carbon is in soil pools, which account for up to 50-90% of the total carbon stock of mangroves (Donato et al., 2011; Kauffman et al., 2011; Sharma et al., 2020). Hamilton and Friess (2018) demonstrated that 70.65% of global mangrove carbon is deposited in mangrove soils. Alongi et al. (2015) and Murdiyarso et al. (2015) both reported that the mean proportion of organic soil carbon
Estimation of biomass, carbon stocks and soil sequestration of Gowatr mangrove forests, Gulf of Oman
Iranian Journal of Fisheries Sciences, 2020
The mangrove forest ecosystem is known to possess a variety of ecosystem services, including high rates of carbon sequestration, storage and mitigating climate change through reduced deforestation. This study was carried out in the mangrove forests of Gowatr Bay, Gulf of Oman during 2017-18 to quantify biomass and carbon stocks of all components of this forest, including live and dead trees, soil, pneumatophores, herbaceous and litter in three stations during post-monsoon and pre-monsoon. We examined that biomass, carbon stocks and soil carbon varied significantly with spatial locations (p 0.05). The mean of biomass and carbon stock were estimated 125.54±19.31 and 129.21±19.64 Mg ha-1, and 48.48±7.51 and 49.9±7.5 Mg ha-1, in post-monsoon and pre-monsoon, respectively. Also, Soil carbon was determined 227.1±11.86 and 227.3±11.71 Mg ha-1 in post-monsoon and pre-monsoon, respectively. A positive correlation was found between the vegetation biomass and soil organic carbon in post-monsoo...
Journal of Soil Science and Plant Nutrition, 2022
The Amazon rainforest is considered the most important ecosystem in the world for the global carbon balance due to its high carbon storage in soil and in the vegetation. Unfortunately, there are few studies about organic fraction of its soils. Thus, the present research aimed to quantify the soil organic carbon content (OC) and to analyze its spatial distribution using 701 soil samples from minimally anthropic areas compiled from previous studies. Descriptive statistics, Pearson correlation and spatial variability analyses of OC and other physical and chemical soil data were performed. The high variability of OC between soil groups were attributed to the preservation and protection of carbon by oxides, reduction process and organic-rich parent material. OC was strongly positively correlated with total nitrogen (N) content, C:N ratio and cation exchange capacity at pH 7.0. The maps produced showing the spatial distribution of CO and that based on C:N ratio would be support for the creation of priority areas in the conservation of ecosystem.
Faunal mediated carbon export from mangroves in an arid area
Science of The Total Environment, 2021
The outwelling paradigm argues that mangrove and saltmarsh wetlands export much excess production to downstream marine systems. However, outwelling is difficult to quantify and currently 40-50% of fixed carbon is unaccounted for. Some carbon is thought outwelled through mobile fauna, including fish, which visit and feed on mangrove produce during tidal inundation or early life stages before moving offshore, yet this pathway for carbon outwelling has never been quantified. We studied faunal carbon outwelling in three arid mangroves, where sharp isotopic gradients across the boundary between mangroves and downstream systems permitted spatial differentiation of source of carbon in animal tissue. Stable isotope analysis (C, N, S) revealed 22-56% of the tissue of tidally migrating fauna was mangrove derived. Estimated consumption rates showed that 1.4% (38 kg C ha −1 yr −1) of annual mangrove litter production was directly consumed by migratory fauna, with <1% potentially exported. We predict that the amount of faunally-outwelled carbon is likely to be highly correlated with biomass of migratory fauna. While this may vary globally, the measured migratory fauna biomass in these arid mangroves was within the range of observations for mangroves across diverse biogeographic ranges and environmental settings. Hence, this study provides a generalized prediction of the relatively weak contribution of faunal migration to carbon outwelling from mangroves and the current proposition, that the unaccounted-for 40-50% of mangrove C is exported as dissolved inorganic carbon, remains plausible.
Sedimentation and soil carbon accumulation in degraded mangrove forests of North Sumatra, Indonesia
Mangrove ecosystems are often referred to as “land builders” because of their ability to trap sediments transported from the uplands as well as from the oceans. The sedimentation process in mangrove areas is influenced by hydro-geomorphic settings that represent the tidal range and coastal geological formation. We estimated the sedimentation rate in North Sumatran mangrove forests using the 210Pb radionuclide technique, also known as the constant rate supply method, and found that mudflats, fringes, and interior mangroves accreted 4.3 ± 0.2 mm yr−1, 5.6 ± 0.3 mm yr1, and 3.7 ± 0.2 mm yr−1, respectively. Depending on the subsurface changes, these rates could potentially keep pace with global sea level rise of 2.6−3.2 mm yr−1, except the interior mangrove they would also be able to cope with regional sea-level rise of 4.2 ± 0.4 mm yr−1. The mean soil carbon accumulation rates in the mudflats, fringes, and interior areas were 40.1 ± 6.9 g C m−2yr−1, 50.1 ± 8.8 g C m−2yr−1, and 47.7 ± 1...