Soil salinity and sodicity in a shrimp farming coastal area of the Mekong Delta, Vietnam

Truong, Nguyen Quang; Vromant, Nico; Hung, Nguyen Thanh; Hens, Luc

doi:10.1007/s00254-007-0951-z

Cited by 55 publications

(33 citation statements)

References 11 publications

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“…The result suggests there was a saline accumulation stage from autumn to winter. Wu et al (2009) found a similar result in his study, which many researchers attributed to seasonal rainfall (Silvestri et al 2005;Tho et al 2007). Generally, soil salt content represents the level of soil salinity.…”

Section: Discussionsupporting

confidence: 77%

Spatial and temporal variations of soil organic carbon and total nitrogen pools in the coastal reclamation area, eastern China

et al. 2015

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The spatial and temporal variation of soil organic carbon (SOC) and soil total nitrogen (STN) in a coastal reclamation area in eastern China were studied based on the ordinary kriging method. The 0-20 cm soil organic carbon pool (SOCP) and soil total nitrogen pool (STNP) ranged from 4.38 to 15.92 Mg/ha and from 0.24 to 2.37 Mg/ha, respectively, during the observed period. The results show there was a low level of spatial variation in both SOC and STN, which is to some extent the result of the same farmland management practiced in this region. The seasonal variation of SOC was attributed to plant growth and crop residue returning back to soil, while the spatial variation was mainly resulted from the fertilization practice. The average 0-20 cm SOCP and STNP were 10.38 ± 2.50 and 1.27 ± 0.38 Mg/ha, respectively, in the study region, both of which were much lower than in other ecosystems. Further analysis indicated that SOC was positively correlated with STN. This work revealed that the reclamation area from the tidal flat should be a potential sink for SOC and STN.

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Section: Discussionsupporting

confidence: 77%

Spatial and temporal variations of soil organic carbon and total nitrogen pools in the coastal reclamation area, eastern China

et al. 2015

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“…The stocking density of hard clams was negatively correlated with the TEs and CEs. This result agrees with those of other studies of the stocking density impact on hard clam farms (Golez 1995;Joyce and Mats 2006;Tho et al 2008). Therefore, lower stocking densities of hard clams are necessary to maximize efficiency, especially for pond sizes less than 1 ha, because natural food sources are limited and farms do not supply feed to shrimp and hard clams in culture.…”

Section: Discussionsupporting

confidence: 94%

Effects of Culture Area, Stocking Density, and Shrimp and Fish Polyculture on the Cost Efficiency of Hard Clam, Meretrix meretrix, Culture: A Case Study of Hard Clam Farms in Yunlin, Taiwan

Huang

Chou

Lee

et al. 2016

J World Aquaculture Soc

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Using the hard clam farms in Yunlin, Taiwan as examples, this study analyzes the effects of culture area, stocking density, and shrimp and fish polyculture on the cost efficiency (CE) of hard clam farming. A data envelopment analysis (DEA) is used to estimate the farms' technical efficiency (TE), allocative efficiency (AE), and CE values. The findings show that the mean TE, AE, and CE values of hard clam farms are 0.74, 0.57, and 0.43, respectively. The TE value is higher than the AE value, which indicates that cost inefficiency is mainly attributable to poor AE. Tobit regression results suggest that there are positive relationships between CE and both culture area and operator experience. Hard clam stocking density and age of the operators have negative effects on CE. Hard clam culture areas larger than 2 ha and a stocking density of 1.1-1.2 million hard clams per hectare have higher CEs than smaller culture areas and smaller or larger stocking densities. The use of sand shrimp, white shrimp, kuruma shrimp, and grass shrimp for polyculture and the use of milkfish and silver sea bream for polyculture are both associated with high CEs.The hard clam is one of the main types of shellfish cultured in Taiwan, and its output is highest among cultured shellfish. With an output of 34,755 MT in 2013, Yunlin County is the primary producer of hard clams in Taiwan: Yunlin contains the largest culture area in Taiwan, produces almost 60% of Taiwan's hard clam supply and yields output values as high as 77.25 million USD. Hard clam cultivation has become a 1 Correspondence to: jmlee866@yahoo.com.tw main source of income for the fishermen of Yunlin County.In the past, most Yunlin hard clam farms relied on monoculture. However, the growth of hard clam output has resulted in decreases in the price of hard clams in recent years. Consequently, farms must continuously increase the cost efficiency (CE) of hard clam culture to reduce costs and increase profits. improves the ecosystem balance of the culture ponds by reducing the quantity and precipitates of organic matter in the culture ponds (Smith 1985;Smith and Piedrahita 1988;Shpigel and Blaylock 1991;Yokoyama et al. 2002;Nhan 2007;Martinez-Porchas et al. 2010). Taiwan's hard clam farms primarily co-culture hard clams with milkfish, grass shrimp, sand shrimp, white shrimp, and kuruma shrimp. Recent increases in the demand for shrimp have increased the price of shrimp, which has prompted hard clam farms to increase the quantity of shrimp species in polyculture operations.Previous studies have successively researched the culture growth rate, culture environment factors, and disease control for the polyculture of shrimp, fish, and mollusk species (McLarney 1976;Costa-Pierce et al. 1984;Lui 1989;Zhang and Wang 1990;Lui et al. 1992;Chang et al. 1994;Yu et al. 1996;Handå et al. 2012). The polyculture of freshwater prawns and fishes is feasible in the USA (Buck et al. 1981;Costa-Pierce et al. 1984;Bessa Junior et al. 2012), and shrimp ponds have been used in the USA to overwinter c...

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“…There is growing documentation on the adverse effects of high salinity levels on rice-high soil salinity prevents growth (Tho et al 2008), reduces germination, causes browning of rice fields (Gain 1995), and decreases rice production (Ali 2006). Table 3 shows that 72 % of respondents in severe and 82 % of respondents in moderate safe water scarcity areas have been affected in their agriculture-based livelihood because of soil and water salinity.…”

Section: Impactsmentioning

confidence: 99%

Community Perception and Adaptation to Safe Drinking Water Scarcity: Salinity, Arsenic, and Drought Risks in Coastal Bangladesh

Abedin

Habiba

Shaw

2014

Int J Disaster Risk Sci

102

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One of the most serious resource and health issues in coastal communities of Bangladesh is the scarcity of safe drinking water, triggered by the combined effects of salinity, arsenic, and drought. This article explores community perception of vulnerabilities in daily life, livelihood, and environment, and investigates how communities and institutions cope with or adapt to drinking water scarcity. This study outlines community expectations for support from government and nongovernment organizations to overcome this problem. The findings reveal that nearly all respondents from the drinking water scarcity area perceive that salinity is the primary reason for the lack of safe drinking water compared to arsenic and drought hazards. Despite a number of socioeconomic factors and a geographical location that aggravates the coastal communities' vulnerability, these communities have established their own adaptation mechanism to cope with this crisis. Government and nongovernment organizations have also supported community efforts to cope with the problem. By emphasizing both community adaptation methods and efforts of institutions, this article illustrates an integrated community-based approach, which would be effective for reducing drinking water scarcity in the southwestern coastal region of the country.

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Soil salinity and sodicity in a shrimp farming coastal area of the Mekong Delta, Vietnam

Cited by 55 publications

References 11 publications

Spatial and temporal variations of soil organic carbon and total nitrogen pools in the coastal reclamation area, eastern China

Spatial and temporal variations of soil organic carbon and total nitrogen pools in the coastal reclamation area, eastern China

Effects of Culture Area, Stocking Density, and Shrimp and Fish Polyculture on the Cost Efficiency of Hard Clam, Meretrix meretrix, Culture: A Case Study of Hard Clam Farms in Yunlin, Taiwan

Community Perception and Adaptation to Safe Drinking Water Scarcity: Salinity, Arsenic, and Drought Risks in Coastal Bangladesh

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