Changes in soil characteristics and C dynamics after mangrove clearing (Vietnam)

Grellier, Séraphine; Janeau, Jean‐Louis; Nhon, Dang Hoai; Kim, Cuc Nguyen Thi; Phuong, Quynh Le Thi; Thu, Thao Pham Thi; Nhu-Trang, Tran–Thi; Marchand, Cyril

doi:10.1016/j.scitotenv.2017.03.204

Cited by 57 publications

(33 citation statements)

References 40 publications

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“…The average rate of sediment CO2 efflux from mangrove clearance sites throughout New Zealand is 133.9 ± 37.2 mmol m -2 d -1 , which is comparable to rates observed in cleared mangrove sites in the tropics (Bulmer et al 2015). The rate of sediment CO2 efflux from cleared mangroves varies based on a number of factors, such as time since clearance (Grellier et al 2017;Lovelock et al 2011), the organic matter content of the sediment column, as well as clearance methodology (Bulmer et al 2015;Bulmer et al 2017b). For example, mechanical mulching and dispersal of aboveground biomass in situ has been associated with sediment CO2 efflux 7 times higher than that of smaller hand clearances where aboveground biomass was removed from the site (Bulmer et al 2015).…”

Section: Effects Of Mangrove Clearance On Carbon Dynamicsmentioning

confidence: 54%

“…In comparison, a recent assessment of changing soil characteristics following mangrove clearing in Vietnam found that sediment properties evolved to a depth of 35 cm as a result of the clearing activity. The mud and sediment organic carbon content decreased by > 65 % in the 2 years following mangrove removal, with a variable mud content of < 80 % from the surface to around 30 cm depth, after which both the cleared and intact mangrove sediment cores presented similar mud content of > 90 % (Grellier et al 2017).…”

Section: Effects Of Mangrove Clearance On Sediment Compositionmentioning

confidence: 98%

“…Organic content in particular is correlated with the mud content, and so temporal shifts tend to mirror textural changes (e.g. Grellier et al 2017).…”

Section: Effects Of Mangrove Clearance On Sediment Compositionmentioning

confidence: 99%

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The Dynamics of Expanding Mangroves in New Zealand

Horstman

Lundquist

Bryan

et al. 2018

Coastal Research Library

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In contrast to the global trend of mangrove decline, New Zealand mangroves are rapidly expanding, facilitated by elevated sediment inputs in coastal waters as a consequence of large-scale land use changes following European settlement. New Zealand mangroves are at the southern limit of the global mangrove extent, which limits the tree height of Avicennia marina var. australasica, the only mangrove species present. Mangroves in New Zealand thrive in the sheltered environments of infilling drowned river valleys with abundant supply of fine terrigenous sediments, showing various stages of mangrove succession and expansion dynamics. Bio-physical interactions and carbon dynamics in these expanding temperate mangrove systems show similarities to, but also differ from those in tropical mangrove forests, for instance due to the limited height and complexity of the mangrove communities. Likewise, ecosystem services provided by New Zealand mangroves deviate from those offered by tropical mangroves. In particular, the association of mangrove expansion with the accumulation of (the increased supply of) fine sediments and the consequent change of estuarine ecosystems, has provoked a negative perception of mangrove expansion and subsequently led to mangrove clearing. Over recent decades, a body of knowledge has been developed regarding the planning and decision making relating to mangrove removal, yet there are still effects that are unknown, for example with respect to the post-clearance recovery of the original sandflat ecosystems. In this chapter we discuss the dynamics of New Zealand's expanding mangroves from a range of viewpoints, with the aim of elucidating the possible contributions of expanding mangroves to coastal ecosystem services, now and in the future. This chapter also reviews current policies and practice regarding mangrove removal in New Zealand and addresses the (un)known effects of mangrove clearance. These combined insights may contribute to the development of integrated coastal management strategies that recognise the full potential of expanding mangrove ecosystems.

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Section: Effects Of Mangrove Clearance On Carbon Dynamicsmentioning

confidence: 54%

Section: Effects Of Mangrove Clearance On Sediment Compositionmentioning

confidence: 98%

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The Dynamics of Expanding Mangroves in New Zealand

Horstman

Lundquist

Bryan

et al. 2018

Coastal Research Library

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“…Previous studies regarding the decrease in area of mangroves are also in line with our findings. Mangroves were estimated to cover around 1.2% of the country in 1943 (Maurand, 1943) but decreased to 0.42% in 2010 mostly because of the expansions of aquaculture and rice paddies (Richards and Friess, 2016;Grellier et al, 2017). These dynamics are clearly shown in Figure 4, but are particularly clear for Ca Mau province in Figure 6.…”

Section: Discussionmentioning

confidence: 98%

Linking Earth Observations for Assessing the Food Security Situation in Vietnam: A Landscape Approach

Poortinga¹,

Nguyen

Tenneson³

et al. 2019

Front. Environ. Sci.

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Land cover change and its impact on food security is a topic that has major implications for development in population-dense Southeast Asia. The main drivers of forest loss include the expansion of agriculture and plantation estates, growth of urban centers, extraction of natural resources, and water infrastructure development. The design and implementation of appropriate land use policies requires accurate and timely information on land cover dynamics to account for potential political, economical, and agricultural consequences. Therefore, SERVIR-Mekong led the collaborative development of a Regional Land Cover Monitoring System (RLCMS) with key regional stakeholders across the greater Mekong region. Through this effort, a modular system was used to create yearly land cover maps for the period 1988-2017. In this study, we compared this 30-year land cover time-series with Vietnam national forest resources and agricultural productivity statistics. We used remote sensing-derived land cover products to quantify landscape changes and linked those with food availability, one of food security dimension, from a landscape approach perspective. We found that agricultural production has soared while the coverage of agricultural areas has remained relatively stable. Land cover change dynamics coincide with important legislation regarding environmental management and sustainable development strategies in Vietnam. Our findings indicate that Vietnam has made major steps toward improving its' food security. We demonstrate that RLCMS is a valuable tool for evaluating the relationship between policies and their impacts on food security, ecosystem services and natural capital.

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“…Mangroves are flooded environments, located in the intersection between the water coming from the continent and the ocean (Food and Agriculture Organization of the United Nations., 2007; Hatje and Barros, 2012) For this reason mangrove soils are completle different than soil from terrestrial forests (Huerta-Diaz and Morse, 1990;. The saline environment and redox conditions influenced by tidal, leads to a serie of geochemical processes which are essential for the production of some Ecosystem Services, such as carbon retention and water filtering Grellier et al, 2017;. Besides that, mangrove forests are also key ecosystem for the ocean and terrestrial biodiversity, while it also play an important role on human protection from catatrophic events, by the attenuation the effects of ocean and wind disturbances (Costanza et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Restoration of mangrove forests: resilience of pedogenetic processes and soil quality

Jimenez¹

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Changes in soil characteristics and C dynamics after mangrove clearing (Vietnam)

Cited by 57 publications

References 40 publications

The Dynamics of Expanding Mangroves in New Zealand

The Dynamics of Expanding Mangroves in New Zealand

Linking Earth Observations for Assessing the Food Security Situation in Vietnam: A Landscape Approach

Restoration of mangrove forests: resilience of pedogenetic processes and soil quality

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