Resilience and shifts in agro-ecosystems facing increasing sea-level rise and salinity intrusion in Ben Tre Province, Mekong Delta

Renaud, Fabrice G.; Le, Thi Thu Huong; Lindener, Carina; Guong, Vo Thi; Sebesvári, Zita

doi:10.1007/s10584-014-1113-4

Cited by 125 publications

(88 citation statements)

References 20 publications

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“…Fish and shrimp farming have a long tradition and increased rapidly while becoming a very important industry (international trade and export) and the dominant land use in many coastal areas [45]. More farmers also shift from traditional rice farming to saline aquaculture to increase income or to adapt to increased salinity levels since sea water intrusion is a critical issue in the delta [3]. More than 70 percent of the total national fish and almost 80 percent of the total shrimp are produced in the delta [46].…”

Section: Study Areamentioning

confidence: 99%

“…In East and Southeast Asia, more and more farmers shift from traditional rice farming to more profitable aquaculture or hybrid rice-shrimp or rice-fish systems [3] to generate more income. The rapid growth of aquaculture (see Figure 1) coincides with an increased input of feeds (fish oil and fish meal), and use of antibiotics, pesticides and other chemicals [1,4].…”

Section: Introductionmentioning

confidence: 99%

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Large-Scale Assessment of Coastal Aquaculture Ponds with Sentinel-1 Time Series Data

2017

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Abstract:We present an earth observation based approach to detect aquaculture ponds in coastal areas with dense time series of high spatial resolution Sentinel-1 SAR data. Aquaculture is one of the fastest-growing animal food production sectors worldwide, contributes more than half of the total volume of aquatic foods in human consumption, and offers a great potential for global food security. The key advantages of SAR instruments for aquaculture mapping are their all-weather, day and night imaging capabilities which apply particularly to cloud-prone coastal regions. The different backscatter responses of the pond components (dikes and enclosed water surface) and aquaculture's distinct rectangular structure allow for separation of aquaculture areas from other natural water bodies. We analyzed the large volume of free and open Sentinel-1 data to derive and map aquaculture pond objects for four study sites covering major river deltas in China and Vietnam. SAR image data were processed to obtain temporally smoothed time series. Terrain information derived from DEM data and accurate coastline data were utilized to identify and mask potential aquaculture areas. An open source segmentation algorithm supported the extraction of aquaculture ponds based on backscatter intensity, size and shape features. We were able to efficiently map aquaculture ponds in coastal areas with an overall accuracy of 0.83 for the four study sites. The approach presented is easily transferable in time and space, and thus holds the potential for continental and global mapping.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large-Scale Assessment of Coastal Aquaculture Ponds with Sentinel-1 Time Series Data

2017

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“…A similar strategy might be appropriate for coastal areas of the Mekong Delta in Vietnam, which also are subject to saline intrusion [143][144][145][146]. Scientists at the International Rice Research Institute and in several national research centers are developing flood-tolerant varieties with enhanced resistance to submergence [147,148].…”

Section: National and International Investmentsmentioning

confidence: 99%

Managing Water and Soils to Achieve Adaptation and Reduce Methane Emissions and Arsenic Contamination in Asian Rice Production

Wichelns

2016

Water

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Rice production is susceptible to damage from the changes in temperature and rainfall patterns, and in the frequency of major storm events that will accompany climate change. Deltaic areas, in which millions of farmers cultivate from one to three crops of rice per year, are susceptible also to the impacts of a rising sea level, submergence during major storm events, and saline intrusion into groundwater and surface water resources. In this paper, I review the current state of knowledge regarding the potential impacts of climate change on rice production and I describe adaptation measures that involve soil and water management. In many areas, farmers will need to modify crop choices, crop calendars, and soil and water management practices as they adapt to climate change. Adaptation measures at the local, regional, and international levels also will be helpful in moderating the potential impacts of climate change on aggregate rice production and on household food security in many countries. Some of the changes in soil and water management and other production practices that will be implemented in response to climate change also will reduce methane generation and release from rice fields. Some of the measures also will reduce the uptake of arsenic in rice plants, thus addressing an important public health issue in portions of South and Southeast Asia. Where feasible, replacing continuously flooded rice production with some form of aerobic rice production, will contribute to achieving adaptation objectives, while also reducing global warming potential and minimizing the risk of negative health impacts due to consumption of arsenic contaminated rice.

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“…They mostly occur in the lower Mekong Basin, which has been severely impacted by climate change (Le et al, 2007;Erwin, 2009;Renaud and Kuenzer, 2012;Bastakoti et al, 2014 Sea level rise has significant impacts on the coastal zone, where soils will become saline and/or highly sodic (Renaud et al, 2014). Sodic soils are distinguished by an excessively high concentration of Sodium (Na) in their cation exchange complex.…”

Section: Introductionmentioning

confidence: 99%

A study of the carbon stocks of Melaleuca forests in the coastal regions of Southern Vietnam and South East Queensland Australia

Tran¹

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The genus Melaleuca consists of around 260 species. The genus dominates forests that cover more than six million hectares of land globally. Most of that forest occurs in Australia, but there are also smaller areas in countries in South-East Asia and the Caribbean region, and the southern United States of America. Melaleuca forests predominantly occur in wetland and coastal ecosystems and as a result are substantially exposed to the influences of climate change and human development, particularly in regards to impacts on hydrological and soil systems. Like other wetland forest ecosystems, a large amount of carbon is stored in the biomass and soil components of Melaleuca forests. However, up until now very little research has been published on the extent and nature of those carbon stocks. This thesis addresses this gap in the research literature and presents the results of a study that involved collecting data on the carbon stocks of various Melaleuca forests in Australia and Vietnam.A variety of widely recognised data collection methods were used to collect data on the carbon Carbon stock densities of VS1, VS2, VS3, VS4, and VS5 were found to be 275.98 tC/ha, 159.36 tC/ha, 784.68 tC/ha, 544.28 tC/ha, and 246.96 tC/ha, respectively. Carbon stock densities of A1, A2, A3, and A4 were found to be 381.59 tC/ha, 278.40 tC/ha, 210.36 tC/ha, and 241.72 tC/ha, respectively. In Australia, carbon accumulation in forest litter in wet conditions (A1) was likely to be 6.5 times higher than those in drained and drier conditions (A2). The total carbon stock densities in Melaleuca forests in the wildfire conditions were found to be lost around 45 % of those in primary forests under wetter conditions. Furthermore, the exchangeable sodium percentage of Melaleuca forests in Vietnam on sandy soil (VS1 and VS2) showed high sodicity, while those on clay soils (VS3, VS4, and VS5) varied from low to moderate sodicity.ii The results of this thesis also show that: (1) the carbon stock densities of Melaleuca forests in Australia are much greater than previously thought and substantially higher than current estimates used in Australia's national carbon accounting systems; (2) the carbon stock densities of Melaleuca forests on peat lands in Vietnam are large compared to many other forest types around the world; (3) and that Melaleuca forests on sandy soils in Vietnam are tolerant of highly sodic conditions, an important feature considering how climate change and human development in the region is impacting on local hydrological and soil systems. In these regards, the results of this thesis provide important information for the future sustainable management of Melaleuca forests in both Australia and Vietnam, particularly in regards to emerging forest carbon conservation and management initiatives.iii Declaration by author Publications included in this thesisThis thesis includes four jointly authored published articles, as follows: two published papers and two jointly authored works that have been submitted for peer review. These paper...

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Resilience and shifts in agro-ecosystems facing increasing sea-level rise and salinity intrusion in Ben Tre Province, Mekong Delta

Cited by 125 publications

References 20 publications

Large-Scale Assessment of Coastal Aquaculture Ponds with Sentinel-1 Time Series Data

Large-Scale Assessment of Coastal Aquaculture Ponds with Sentinel-1 Time Series Data

Managing Water and Soils to Achieve Adaptation and Reduce Methane Emissions and Arsenic Contamination in Asian Rice Production

A study of the carbon stocks of Melaleuca forests in the coastal regions of Southern Vietnam and South East Queensland Australia

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