Assessment of bioavailable nitrogen and phosphorus content in the sediments of Indian mangroves

Reddy, Y. Ramana; Ganguly, Dipnarayan; Singh, Gurmeet; Prasad, M.H.K.; Arumughan, Paneer Selvam; Banerjee, Kakolee; Kathirvel, Arumugam; Purvaja, R.; Ramachandran, Ramesh

doi:10.1007/s11356-021-13638-7

Cited by 12 publications

(4 citation statements)

References 64 publications

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“…Apart from the physical damage caused by hurricanes and cyclones to mangrove stands, long term successional impacts through a regular supply of allochthonous sediments can also play a significant role in increasing surface elevation levels of these wetlands but at the same time also improve productivity and growth through timely nutrient pulses 2 , 5 , 9 , 26 , 27 . Although the data provided are limited, we find that seasonal changes in organic carbon and phosphorus levels, which is also a limiting nutrient for Indian mangrove wetlands 28 , 29 , tend to slightly increase in post-monsoon season (Fig. 4 ).…”

Section: Resultsmentioning

confidence: 86%

Tropical cyclones shape mangrove productivity gradients in the Indian subcontinent

Rasquinha

Mishra

2021

Sci Rep

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Recent literature on the impact of cyclones on mangrove forest productivity indicates that nutrient fertilizations aided by tropical cyclones enhance the productivity of mangrove forests. We probe the implications of these predictions in the context of Indian mangroves to propose potential future directions for mangrove research in the subcontinent. First, we look at the time series trend (2000–2020) in satellite-derived gross primary productivity (GPP) datasets for seven mangrove forests across the country’s coastline. Second, we compare seasonal changes in soil nutrient levels for a specific site to further the arguments proposed in the literature and investigate the role of potential drivers of mangrove productivity. We find overall increasing trends for GPP over the past two decades for all seven mangrove sites with seasonal fluctuations closely connected to the tropical storm activities for three sites (Bhitarkanika, Pichavaram, and Charao). Additionally, organic carbon and nitrogen levels showed no significant trend, but phosphorus levels were higher during the post-monsoon-winter period for Bhitarkanika. Our findings expand the predictions of previous studies that emphasized the role of storm-induced nutrient fluxes and freshwater supply as primary drivers of productivity gradients in mangroves. Our study provides insights on how mangrove productivity may change with fluctuating frequency and magnitude of cyclones under a changing climate, implying the need for more mechanistic studies in understanding the long-term impact on mangrove productivity in the region.

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Section: Resultsmentioning

confidence: 86%

Tropical cyclones shape mangrove productivity gradients in the Indian subcontinent

Rasquinha

Mishra

2021

Sci Rep

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“…The majority in the study have favored the mangrove restoration, hoping that mangroves will improve the agricultural land fertility. Evidence by Reddy et al (2021) also supports the higher bio-availability of nutrients in the Bhitarkanika region. These findings are especially interesting because they might be a motive for the agriculture and aquaculture expansion in the vicinity of mangroves.…”

Section: Scenario Developmentmentioning

confidence: 74%

Scenario-based quantification of land-use changes and its impacts on ecosystem services: A case of Bhitarkanika mangrove area, Odisha, India

et al. 2022

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Mangrove habitats play a vital role in balancing the coastal ecosystems by providing an array of provisioning, regulating, cultural, and supporting ecosystem services. Despite several conservation measures taken to protect mangroves, they have been facing economic, socio-environmental, and climatic threats. There is a need to quantify the mangroves' ecosystem services (ES), especially in developing and under-developed nations, to fasten up the mangrove conservation. To address this issue, in the present study, we quantified the ES of the mangroves in Odisha State on the eastern coast of India. And we projected the changes in ES according to the plausible future land-use changes using scenario analysis. The plausible future scenarios (by 2030) have been generated based on the participatory surveys and key informant interviews from the stakeholders in the region. The scenarios encompass socio-economic development, infrastructural development, mangrove conservation, agriculture and aquaculture expansion, and climate change. Coastal blue carbon sequestration, sediment retention and export, and nutrient export were quantified using the InVEST (Integrated valuation of ecosystem services and trade-offs) model. Results indicate that disturbances to mangrove forests in Odisha can emit 2.16 Tg C back into the atmosphere by 2030. In an optimistic scenario, mangroves can sequester 1.55 Tg C from the atmosphere. An increase in mangrove and green cover has reduced sediment and nutrient export by a maximum of 24.9% and 7.6%, respectively. The findings will help in evidence-based decision-making about the socio-environmental systems comprising sensitive mangrove ecosystems.

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“…The increased SOC content also directly affected the BD results and its SQ scores [71,72]. Additionally, soil organic matter is an important source of P in mangrove soils [55,73,74], which can indirectly affect the chemical SQ scores.…”

Section: Discussionmentioning

confidence: 99%

Applying the Soil Management Assessment Framework (SMAF) to Assess Mangrove Soil Quality

et al. 2022

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Soil quality (SQ) refers to its capacity to perform its functions. Thus, the SQ index (SQI) is a potentially useful tool for monitoring soil changes induced by mangrove restoration initiatives. Although the soil management assessment framework (SMAF) is a well-developed tool for SQ assessments in diverse ecosystems, it has never been tested on mangrove soils. In this study, we tested the SMAF to evaluate the shifts in the SQ of mangroves in a reforestation initiative using three- and seven-year plantations, which were compared with degraded and mature mangroves. A minimum dataset, composed of the pH and available P as chemical indicators, bulk density as a physical indicator, and soil organic carbon as a biological indicator, was used to calculate the SQI. The SMAF scores facilitated the monitoring of improvement in the mangrove SQ with vegetation development, mainly driven by physical and biological indicators. The SMAF may be a useful tool for monitoring SQ in mangroves under protection and recovery initiatives. Nevertheless, we suggest the inclusion of additional biological and chemical indicators in the minimum dataset for future studies to better represent specific processes and functions (e.g., microbial redox reactions and contaminant immobilization) that can alter the SQ of mangroves.

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Assessment of bioavailable nitrogen and phosphorus content in the sediments of Indian mangroves

Cited by 12 publications

References 64 publications

Tropical cyclones shape mangrove productivity gradients in the Indian subcontinent

Tropical cyclones shape mangrove productivity gradients in the Indian subcontinent

Scenario-based quantification of land-use changes and its impacts on ecosystem services: A case of Bhitarkanika mangrove area, Odisha, India

Applying the Soil Management Assessment Framework (SMAF) to Assess Mangrove Soil Quality

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