Contamination of surface water as affected by land use in acid sulfate soils in the Mekong River Delta, Vietnam

Minh, L.Q.; Tuong, To Phuc; Mensvoort, M.E.F. van; Bouma, J.

doi:10.1016/s0167-8809(96)01084-5

Cited by 69 publications

(43 citation statements)

References 3 publications

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“…Acid sulfate soils occur in about 40% the Mekong Delta (e.g., Minh et al, 1997). The soil acidity results in greater solubility of aluminum, and aluminum toxicity impedes rice growth.…”

Section: Study Sitesmentioning

confidence: 99%

Shared flowering phenology, insect pests, and pathogens among wild, weedy, and cultivated rice in the Mekong Delta, Vietnam: implications for transgenic rice

Cohen

Arpaia

Lan

et al. 2008

Environ. Biosafety Res.

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Many varieties of transgenic rice are under development in countries where wild and weedy relatives co-occur with the crop. To evaluate possible risks associated with pollen-mediated transgene dispersal, we conducted a two-year survey in Vietnam to examine overlapping flowering periods of rice (Oryza sativa L.), weedy rice (O. sativa), and wild rice (O. rufipogon Griff.), all of which are inter-fertile. We surveyed populations in two regions of the Mekong Delta, northern and southern, and at three sites in each of three habitats per region: fresh water, saline water, and acid sulfate soil. Weedy rice frequently flowered simultaneously with neighboring cultivated rice plants. Flowering was more seasonal in wild rice and often peaked in November and December. Peak flowering times of wild rice overlapped with adjacent rice fields at all of the saline sites and half of the acid sulfate sites. The longer flowering season of wild rice ensured that crop-to-wild gene flow was possible in fresh water habitats as well. Our second objective was to determine whether wild and weedy rice populations are exposed to pests that could be targeted by future transgenes, which may then provide fitness benefits. These populations shared many pathogen and insect herbivore species with cultivated rice (leaffolder, locust, cricket, planthoppers, rice bug, stem borer, sheath blight, blast, bacterial leaf blight, and brown spot). Damage by leaffolders and locusts was the most frequently observed insect feeding damage on all three rice types. Indicator species analysis revealed that most of the insect herbivores were associated with particular habitats, demonstrating the importance of broad geographic sampling for transgenic rice risk assessment. These survey data and the strong likelihood of gene flow from cultivated rice suggest that further studies are needed to examine the effects of transgenic traits such as resistance to pests on the abundance of wild and weedy rice.

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“…Acid sulfate soils occur in about 40% the Mekong Delta (e.g., Minh et al, 1997). The soil acidity results in greater solubility of aluminum, and aluminum toxicity impedes rice growth.…”

Section: Study Sitesmentioning

confidence: 99%

Shared flowering phenology, insect pests, and pathogens among wild, weedy, and cultivated rice in the Mekong Delta, Vietnam: implications for transgenic rice

Cohen

Arpaia

Lan

et al. 2008

Environ. Biosafety Res.

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“…At present, there is a worldwide awareness of the environmental impacts of these soils (e.g. van Breemen 1993, Sammut et al 1996, Minh et al 1997, Cook et al 2000. Palko (1994) estimates that AS soils at present cover 3360 km 2 of the Finnish coastal agricultural land, and that approximately half of them are located in C-W Finland.…”

Section: Post War Reclamation and Drainage Of Agricultural Landmentioning

confidence: 99%

pH of streams in western Finland - a perspective from the Middle Ages into the mid 21st century

Åström¹,

Sundström²,

Holmberg³

2008

AFSci

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In the central parts of western Finland, many streams are severely acidified as a result of land-use activities on overburden (soils) capable of producing and ultimately releasing extreme acidity. Consequently, the extent of the acidification problem is likely to have varied over time in response to the type and extent of contemporary land use. In this study, we have combined historical information on land use and knowledge on hydrogeochemical processes in order to assess the pH declines that are likely to have occurred in streams in this area since the Middle Ages. The results show that among several potentially acidifying activities, reclamation of mires for farmland (19th and 20th centuries) and subsurface drainage of acid sulphate soils (post-war times) are the major causes of the pH decline. Recent methods developed to combat the acidification and possible future changes in pH are discussed.

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“…Cultural practices developed to reclaim these soils depend upon liming and leaching of toxic substances. Leaching results in the transfer of acidity to the surroundings, lead-ing to severe acidification of the local aquatic environment (Minh et al, 1997). Acid can also be exported farther into tidal creeks and estuarine waters, where mass mortalities of fish have been recorded, and there is evidence of chronic long-term effects on coastal habitats (Sammut et al, 1996;Wilson et al, 1999;see also Macdonald et al, Chapter 8, this volume).…”

Section: Environmental Impactsmentioning

confidence: 99%

Land and water management in coastal zones: dealing with agriculture-aquaculture-fishery conflicts.

Gowing¹,

Tuong²,

Hoanh³

2006

Environment and Livelihoods in Tropical Coastal Zones: Managing Agriculture-Fishery-Aquaculture Conflicts

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The coastal environment has undergone rapid change in recent times. Change in the state of the environment is multifaceted, but a key concern is the way that natural habitats -principally mangrove forests and salt marshes -have been extensively cleared and converted to shrimp farming and other uses. The expansion of shrimp farming has also encroached onto agricultural lands. Coastal shrimp farming has been practised for a very long time in some countries as part of the traditional livelihood system, but recent strong demand in global markets, together with technological advances, has fuelled rapid expansion. These rapid, and generally unplanned changes, have provoked conflicts among the three dominant resource-dependent livelihoods in the inland coastal zone: agriculture, shrimp farming and fishing.The coastal zone is characterized by ambiguities of resource ownership and a complex web of interactions among people, resources and ecosystems. Conflicts exist between the drive for short-term financial gain and the desire for long-term sustainable development. Conflicts exist between the priorities of people who derive their livelihoods from aquaculture and those who depend upon agriculture. Conflicts exist between the needs of people who may gain from intensification of land use for agriculture and/or aquaculture and other people (e.g. fisherfolk), whose livelihoods may be adversely affected by environmental impacts. This synthesis chapter presents a discussion of trends, problems and approaches to managing change in the inland coastal zone. We identify key messages from previous research and development experience and consider the supporting evidence for these messages.

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Contamination of surface water as affected by land use in acid sulfate soils in the Mekong River Delta, Vietnam

Cited by 69 publications

References 3 publications

Shared flowering phenology, insect pests, and pathogens among wild, weedy, and cultivated rice in the Mekong Delta, Vietnam: implications for transgenic rice

Shared flowering phenology, insect pests, and pathogens among wild, weedy, and cultivated rice in the Mekong Delta, Vietnam: implications for transgenic rice

pH of streams in western Finland - a perspective from the Middle Ages into the mid 21st century

Land and water management in coastal zones: dealing with agriculture-aquaculture-fishery conflicts.

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