Forest structure of arid zone mangroves in relation to their physical and chemical environment in the western Gulf of Kachchh, Gujarat, Northwest coast of India

Saravanakumar, A.; Rajkumar, M.; Sun, Jun; Serebiah, J. Sesh; Thivakaran, G. A.

doi:10.1007/s11852-009-0070-y

Cited by 12 publications

(8 citation statements)

References 36 publications

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“…), 2·9–25·6 g kg −1 in India (Saravanakumar et al . ) and 82·0–185·6 g kg −1 in Brazil mangrove soils (Prada‐Gamero et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…Studies have shown that the organic matter content of these ecosystems varies widely with location, but generally is medium to high. Organic carbon contents of 23Á8-102Á8 g kg À1 were reported in China (Zhang et al 2009), 2Á9-25Á6 g kg À1 in India (Saravanakumar et al 2009) and 82Á0-185Á6 g kg À1 in Brazil mangrove soils (Prada-Gamero et al 2004). Variations from 2Á0 to 13Á6 g kg À1 in restinga (Oliveira et al 2010) and 30Á3 g kg À1 in the Atlantic Forest soils (Valpassos et al 2007), both from Brazil, have been found.…”

Section: Micro-organism Populationsmentioning

confidence: 96%

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Microbial populations and activities of mangrove, restinga and Atlantic forest soils from Cardoso Island, Brazil

Pupin

Nahas

2014

J Appl Microbiol

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Aim: Mangroves provide a distinctive ecological environment that differentiates them from other ecosystems. This study deal to evaluate the frequency of microbial groups and the metabolic activities of bacteria and fungi isolated from mangrove, restinga and Atlantic forest soils. Methods and Results: Soil samples were collected during the summer and winter at depths of 0-2, 2-5 and 5-10 cm. Except for fungi, the counts of the total, sporulating, Gram-negative, actinomycetes, nitrifying and denitrifying bacteria decreased significantly in the following order: Atlantic forest > mangrove > restinga. The counts of micro-organisms decreased by 11 and 21% from the surface to the 2-5 and 5-10 cm layers, but denitrifying bacteria increased by 44 and 166%, respectively. A larger growth of micro-organisms was verified in the summer compared with the winter, except for actinomycetes and fungi. The average frequency of bacteria isolated from mangrove, restinga and Atlantic forest soils was 95, 77 and 78%, and 93, 90 and 95% for fungi, respectively. Bacteria were amylolytic (33%), producers of acid phosphatase (79%) and solubilizers (18%) of inorganic phosphate. The proportions of fungi were 19, 90 and 27%. Conclusion: The mangrove soil studied had higher chemical characteristics than the Atlantic forest, but the high salinity may have restricted the growth of microbial populations. Significance and Impact of the Study: Estimates of the microbial counts and activities were important to elucidate the differences of mangrove ecosystem from restinga and Atlantic forest.

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“…), 2·9–25·6 g kg −1 in India (Saravanakumar et al . ) and 82·0–185·6 g kg −1 in Brazil mangrove soils (Prada‐Gamero et al . ).…”

Section: Discussionmentioning

confidence: 99%

Section: Micro-organism Populationsmentioning

confidence: 96%

Microbial populations and activities of mangrove, restinga and Atlantic forest soils from Cardoso Island, Brazil

Pupin

Nahas

2014

J Appl Microbiol

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“…Thus, a large portion of inflow seawater sinks and becomes subsurface outflow, and only a small portion of Red Sea water could reach Site 8. The restricted circulation contributed to low D.O at S8 due to low solubility in warmer water and stagnant water body (Saravanakumar et al, 2008), and predominance of clay and silt in texture (Table 1).…”

Section: Restricted Circulation To the Southern End Of The Lagoonmentioning

confidence: 99%

Environmental Factors Causing Stress in Avicennia marina Mangrove in Rabigh Lagoon Along the Red Sea: Based on a Multi-Approach Study

2021

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Lagoons along the Red Sea are socio-economically important but most vulnerable ecosystems. Strong evaporation, strengthened due to global warming, leads to high salinity and high temperature in surface water, which exacerbate physiological stress in mangroves. Rabigh Lagoon is characterized by unusually large spatial differences in nutrient dynamics and physicochemical parameters. We conducted a multi-approach study to demonstrate how environmental factors cause growth retardation and stress in mangroves. There were significant variations (P < 0.05) in water salinities and temperatures, nitrogen and phosphorus abundance in sediments, and antioxidants in mangroves among 8 sites across the lagoon. Salinity and water temperature rapidly increased from the northern where Red Sea seawater enters to the southern end, but dissolved oxygen declined. High salinity (44.9), high surface water temperature (28.8°C) and relatively high nutrients at the southern end of the lagoon (S8) corresponded to high concentrations of antioxidants. High δ13C (−12.4‰) and δ15N (4.9‰) in the sediments at S8 also reveal relatively high nutrient level due to stagnant water, camel grazing, and runoff bringing in fertilizer from agriculture activities in the catchments during seasonal flooding events. Principal component analyses showed that N and P limitation at the lagoon entrance is the leading cause for mangrove stress, while high salinity, temperature, and low dissolved oxygen are the predominant factors for high antioxidants concentrations at the southern end of the lagoon.

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“…Mangrove forests are distributed mainly in subtropical and tropical regions and are rarely found in arid regions, where they have to endure more extreme conditions due to the hot and dry climate. Since salinity is correlated positively with temperature and negatively with the amount of precipitation (Saravanakumar et al, 2009), soil salinity is likely to be higher in arid regions (Naidoo et al, 2011). In addition, mangrove forests in arid regions show a lack of nutrients because of the low input of decomposable organic matter and low precipitation (Alongi et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Interactions between topsoil properties and ecophysiological responses of mangroves (Avicenniamarina) along the tidal gradient in an arid region in Qatar

Chang¹,

Han²,

Kim³

et al. 2020

Turk J Agric For

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This study investigated the interactions between topsoil properties and ecophysiological responses of Avicennia marina along the tidal gradient in an arid region in Qatar. In February 2017, three plots were established, each at a distance of 0 m (D0), 50 m (D50), and 100 m (D100) from the inland boundary of a mangrove forest. Soil samples were collected at 0-10-cm depth in each plot to determine the chemical properties, and the density of seedlings, saplings, and trees was measured. Moreover, above-(AGB) and below-ground biomass (BGB) were calculated using an allometric equation for A. marina with the measured diameter at breast height in February 2017. As an indicator of salt stress, chlorophyll fluorescence parameters were measured in October 2017. Salinity (45.60 ppt) and exchangeable sodium percentage (ESP; 29.02%) at D100 were significantly highest. AGB was higher at D100 (41.44 Mg ha-1) than at D0 (0 Mg ha-1) and D50 (7.33 Mg ha-1), and BGB was higher at D100 (44.91 Mg ha-1) than only at D0 (0 Mg ha-1). There was no significant difference in the density of seedlings, saplings, or trees or the chlorophyll fluorescence parameters among the plots. Salt stress was not induced despite the hypersalinity at this site, since A. marina growing in an arid climate can endure strong salinity. Soil pH was highest at D0, followed by at D50 and D100. Organic matter, total nitrogen, available phosphorus, and cation exchange capacity were significantly higher at D100 than at D0 and D50. Higher concentrations of nutrients on the seaward side might result from the tidal gradient and a large input of organic matter and low soil alkalinity.

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Forest structure of arid zone mangroves in relation to their physical and chemical environment in the western Gulf of Kachchh, Gujarat, Northwest coast of India

Cited by 12 publications

References 36 publications

Microbial populations and activities of mangrove, restinga and Atlantic forest soils from Cardoso Island, Brazil

Microbial populations and activities of mangrove, restinga and Atlantic forest soils from Cardoso Island, Brazil

Environmental Factors Causing Stress in Avicennia marina Mangrove in Rabigh Lagoon Along the Red Sea: Based on a Multi-Approach Study

Interactions between topsoil properties and ecophysiological responses of mangroves (Avicenniamarina) along the tidal gradient in an arid region in Qatar

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