Fine root production in a chronosequence of mature reforested mangroves

Arnaud, Marie; Morris, Paul J.; Baird, Andy J.; Dang, Huyen Tran; Tuệ, Nguyễn Tài

doi:10.1111/nph.17480

Cited by 25 publications

(26 citation statements)

References 79 publications

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“…Previous local-scale studies have shown that precipitation was related to mangrove root production as in our findings (Hayes et al, 2019;, but not all (Arnaud et al, 2021).…”

Section: Global Factors Explaining the Root Productionsupporting

confidence: 54%

Global mangrove root production, its controls and roles in the blue carbon budget of mangroves

Arnaud

Krause

Norby

et al. 2023

Global Change Biology

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Mangroves are among the most carbon-dense ecosystems worldwide. Most of the carbon in mangroves is found belowground, and root production might be an important control of carbon accumulation, but has been rarely quantified and understood at the global scale. Here, we determined the global mangrove root production rate and its controls using a systematic review and a recently formalised, spatially explicit mangrove typology framework based on geomorphological settings. We found that global mangrove root production averaged ~770 ± 202 g of dry biomass m −2 year −1 globally, which is much higher than previously reported and close to the root production of the most productive tropical forests. Geomorphological settings exerted marked control over root production together with air temperature and precipitation (r 2 ≈ 30%, p < .001). Our review shows that individual global changes (e.g. warming, eutrophication, drought) have antagonist effects on root production, but they have rarely been studied in combination. Based on this newly established root production rate, root-derived carbon might account for most of the total carbon buried in mangroves, and 19 Tg C lost in mangroves each year (e.g. as CO 2 ). Inclusion of root production measurements in understudied geomorphological settings (i.e. deltas), regions (Indonesia, South America and Africa) and soil depth (>40 cm), as well as the creation of a mangrove root trait database will push forward our understanding of the global mangrove carbon cycle for now and the future. Overall, this review presents a comprehensive analysis of root production in mangroves, and highlights the central role of root production in the global mangrove carbon budget.

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“…Previous local-scale studies have shown that precipitation was related to mangrove root production as in our findings (Hayes et al, 2019;, but not all (Arnaud et al, 2021).…”

Section: Global Factors Explaining the Root Productionsupporting

confidence: 54%

Global mangrove root production, its controls and roles in the blue carbon budget of mangroves

Arnaud

Krause

Norby

et al. 2023

Global Change Biology

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“…We undertook our field investigation at the Can Gio Biosphere Reserve (CGBR) in the Mekong Delta in the south of Vietnam (Figure 2). The site in CGBR is typical of many Southeast Asian mangroves, insofar as: (i) it is a dense carbon store (910.7 ± 32.2 t C ha −1 [Dung et al, 2016]); (ii) it is dominated by trees of the Rhizophora genus (Arnaud et al, 2021; Donato et al, 2011); (iii) the sediment matrix is mostly composed of clay‐sized grains (70% of sediment by weight: Arnaud et al, 2020), which is typical of deltaic or riverine mangroves (Woodroffe, 1992); and (iv) it has an average groundwater outwelling discharge of between 3.1 and 7.1 cm day −1 , which is within the range previously reported in mangroves more broadly (Taillardat et al, 2018; Tait et al, 2016). The tidal regime is irregular and semi‐diurnal, with a maximum amplitude of 3.3–4.1 m in October and November (Thi Hoa Binh et al, 2008; Van Loon et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

“…I G U R E 2 Location of the study area and distribution of the monitoring plots. Modified fromArnaud et al (2021) andTaillardat et al (2018) …”

mentioning

confidence: 99%

The effect of crab burrows on soil‐water dynamics in mangroves

Arnaud

Baird

Morris

et al. 2022

Hydrological Processes

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Many mangrove ecosystem services, such as carbon sequestration, are closely linked to mangrove soil water content, which in turn is thought to depend on animal burrow density and the properties of the sediment in which the burrows are constructed. We measured the water content in the sediment matrix between crab burrows across 26 plots in a typical, fine‐grained (clay), mangrove soil in the Mekong Delta, Vietnam. We found that the water content of the sediment matrix remained more or less constant throughout the tidal cycle, and was independent of burrow density. Our results suggest that there is little exchange of water between the burrows and the associated sediment matrix and that burrows act as an independent pipe network transporting water through the mangrove soil. To check and extend our findings, we used a numerical groundwater model to simulate an idealized burrow in a range of sediment types. The model results confirmed that fine‐grained mangrove sediments do not drain readily into adjacent animal burrows because of their very low permeability. Our results have important implications for understanding and forecasting mangrove carbon dynamics with sea level rise.

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“…Belowground roots can be divided into live and dead roots, showing differences based on the mangrove species involved, sediment depth, and environmental factors (Arnaud et al 2021). Chen et al (2021) found that most live roots were concentrated in the upper 30 cm, which was called the root zone in sediment.…”

Section: Introductionmentioning

confidence: 99%

“…). In previous study in mature Vietnamese mangroves, minirhizotrons were used to investigate ne root production and the variation in root depth along a chronosequence; the researchers found that ne root production occurred deeper than 30 cm in sediment and decreased with forest age (Arnaud et al, 2021). Furthermore, ne root production and turnover rates were found to be related to sediment variables of mangroves (Xiong et al, 2017).The drivers of root decomposition contributed to the C budgets and proved that C contents from dead roots was a key source of C inputs in sediment of mangroves and saltmarshes (Ouyang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

How fine root turnover functions during mangrove root zone expansion and affects belowground carbon processes

et al. 2023

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Background and aimsFine roots help to maintain sediment volume and resist soil compaction in mangroves. In addition, ne root turnover contributes to belowground carbon stocks. This study focused on root zone dynamics, and aimed to quantify the composition of live and dead ne roots and analyze their functions during root zone expansion and belowground carbon accumulation. MethodsShallow surface elevation tables for measuring root zone expansion were set up in Dongzhaigang Bay of Hainan Province, China; root cores and in-growth bags for measuring ne root biomass and turnover rates were used in four typical mangrove forests. ResultsFine root biomass contributed over 60% to belowground roots, and was mainly composed of up to 69.25% dead ne roots. Fine root productivity ranged from 1.97 to 5.30 t ha − 1 yr − 1 and did not showed signi cantly difference among these forests. Fine root turnover rates ranged from 6-14% per year within the four forests, showing the fastest in Bruguiera forest, followed by Kandelia forest, Sonneratia plantation and Rhizophora forest. Root zone expansion rates ranged from 0.55 to 1.28 mm yr − 1 , and was positively related to live ne root biomass within the upper 50 cm layer of sediment in the four forests types (R 2 = 0.625, p = 0.0022). ConclusionsLive ne root biomass took up less than 30.75% of belowground biomass, but remarkably supported 62.5% of root zone expansion in mangroves. Turnover rates of ne roots signi cantly contributed to the highly dynamic changes in the carbon processes of subsurface sediment.

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Fine root production in a chronosequence of mature reforested mangroves

Cited by 25 publications

References 79 publications

Global mangrove root production, its controls and roles in the blue carbon budget of mangroves

Global mangrove root production, its controls and roles in the blue carbon budget of mangroves

The effect of crab burrows on soil‐water dynamics in mangroves

How fine root turnover functions during mangrove root zone expansion and affects belowground carbon processes

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